- When power switch on (IG), total misfire count of all cylinders in last driving cycle is displayed.
- While engine is running, total misfire count of all cylinders in current driving cycle is displayed.
Lexus NX: Random / Multiple Cylinder Misfire Detected (P0300-P0304)
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Random / Multiple Cylinder Misfire Detected (P0300-P0304)
DESCRIPTION
When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels, and could cause emission control system performance deterioration, the ECM illuminates the MIL and stores a DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0300 | Random / Multiple Cylinder Misfire Detected | Simultaneous misfiring of several cylinders occurs and either of the following conditions is met (2 trip detection logic):
|
| Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected. | DTC stored |
| P0301 | Cylinder 1 Misfire Detected | Misfiring of the No. 1 cylinder occurs and either of the following conditions is met (2 trip detection logic):
|
| Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected. | DTC stored |
| P0302 | Cylinder 2 Misfire Detected | Misfiring of the No. 2 cylinder occurs and either of the following conditions is met (2 trip detection logic):
|
| Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected. | DTC stored |
| P0303 | Cylinder 3 Misfire Detected | Misfiring of the No. 3 cylinder occurs and either of the following conditions is met (2 trip detection logic):
|
| Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected. | DTC stored |
| P0304 | Cylinder 4 Misfire Detected | Misfiring of the No. 4 cylinder occurs and either of the following conditions is met (2 trip detection logic):
|
| Comes on/Blinks* *: The MIL flashes when a catalyst-damaging misfire is detected. | DTC stored |
When DTCs for misfiring cylinders are randomly stored, but DTC P0300 is not stored, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only stored when several misfiring cylinders are detected at the same time.
MONITOR DESCRIPTION
The ECM illuminates the MIL and stores a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).
- Within the first 1000 crankshaft revolutions after the engine starts, an excessive number of misfires (approximately 10 to 50 misfires per 1000 crankshaft revolutions) occurs once.
- An excessive number of misfires (approximately 10 to 50 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.
The ECM flashes the MIL (immediately detection logic) and stores a DTC (2 trip detection logic) when either one of the following conditions, which could cause damage to the three-way catalytic converter, is detected.
- At a high engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected once.
- At a normal engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected 3 times.
MONITOR STRATEGY
| Related DTCs | P0300: Multiple cylinder misfire P0301: Cylinder 1 misfire P0302: Cylinder 2 misfire P0303: Cylinder 3 misfire P0304: Cylinder 4 misfire |
| Required Sensors/Components (Main) | Crankshaft position sensor Camshaft position sensor |
| Required Sensors/Components (Related) | Engine coolant temperature Intake air temperature sensor Mass air flow meter sub-assembly |
| Frequency of Operation | Continuous |
| Duration | 1000 crankshaft revolutions (soon after engine is started: 1 time, other 4 times) (Emission-related misfire) 200 crankshaft revolutions (1 or 3 times) (Catalyst-damaging misfire) |
| MIL Operation | 2 driving cycles: Emission-related misfire MIL flashes immediate: Catalyst-damaging misfire |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
Misfire| Monitor runs whenever the following DTCs are not stored | P0016 (VVT system - misalignment) P0102, P0103 (Mass air flow meter) P0107, P0108 (Manifold absolute pressure) P0112, P0113 (Intake air temperature sensor) P0115, P0117, P0118 (Engine coolant temperature sensor) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor) P0125 (Insufficient coolant temperature for closed loop fuel control) P0327, P0328 (Knock control sensor) P0335 (Crankshaft position sensor) P0340 (Camshaft position sensor) P0351, P0352, P0353, P0354 (Igniter) |
| Auxiliary battery voltage | 8 V or higher |
| VVT system | Not operated by scan tool |
| Engine speed | 6000 rpm or less |
| Either of the following conditions is met | (a) or (b) |
| (a) Engine coolant temperature at engine start | Higher than -7°C (19°F) |
| (b) Engine coolant temperature | Higher than 20°C (68°F) |
| Fuel cut | Off |
| First 1000 revolutions after engine start, or during check mode | Crankshaft 1000 revolutions |
| Except above | Crankshaft 1000 revolutions x 4 |
| All of the following conditions 1, 2, 3 and 4 are met | Crankshaft 200 revolutions x 3 |
| Except above (MIL blinks immediately) | Crankshaft 200 revolutions |
| 1. Driving cycles | 1st |
| 2. Check mode | Off |
| 3. Engine speed | Less than 2700 rpm |
| 4. Intake air amount per revolution | Less than 0.97 g/rev |
TYPICAL MALFUNCTION THRESHOLDS
Monitor Period of Emission-related Misfire| Misfire rate | 2% or higher |
| Number of misfires per 200 revolutions | 119 or more (varies with intake air amount and engine speed) |
MONITOR RESULT
Refer to detailed information in Checking Monitor Status.
Click here .gif)
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A1 | $0B | Multiply by 1 | Count | Total EWMA* misfire count of all cylinders in last ten driving cycles |
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A1 | $0C | Multiply by 1 | Count | |
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A2 | $0B | Multiply by 1 | Count | Total EWMA* misfire count of cylinder 1 in last ten driving cycles |
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A2 | $0C | Multiply by 1 | Count |
|
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A3 | $0B | Multiply by 1 | Count | Total EWMA* misfire count of cylinder 2 in last ten driving cycles |
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A3 | $0C | Multiply by 1 | Count |
|
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A4 | $0B | Multiply by 1 | Count | Total EWMA* misfire count of cylinder 3 in last ten driving cycles |
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A4 | $0C | Multiply by 1 | Count |
|
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A5 | $0B | Multiply by 1 | Count | Total EWMA* misfire count of cylinder 4 in last ten driving cycles |
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $A5 | $0C | Multiply by 1 | Count |
|
HINT:
*: EWMA (Exponential Weighted Moving Average) misfire counts for last 10 driving cycles (calculated) Calculation: 0.1 x (current counts) + 0.9 x (previous average)
Initial value for (previous average) = 0
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Record the DTC(s) and freeze frame data.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Put the engine in inspection mode (maintenance mode).
Click here
-
Using the Techstream, switch the ECM from normal mode to check mode.
Click here
- Read the misfire count of each cylinder (Cylinder #1 Misfire Count to Cylinder #4 Misfire Count) with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.
-
Drive the vehicle so that the vehicle conditions displayed in Misfire RPM and Misfire Load of the Data List are the same as the freeze frame data. Perform this step several times.
HINT:
In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, confirm the Misfire RPM and Misfire Load in the Data List.
Engine speed
Duration
Idling
4.5 minutes or more
1000
4.5 minutes or more
2000
2.5 minutes or more
3000
1.5 minutes or more
-
Check whether misfires have occurred by checking for DTCs and freeze frame data.
HINT:
Do not turn the power switch off until the output DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data are cleared.
- Record the DTC(s), freeze frame data and misfire counts.
- Turn the power switch off and wait for at least 30 seconds.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
WIRING DIAGRAM
Refer to DTC P0102 for the mass air flow meter sub-assembly circuit.
Click here
Refer to Fuel Injector Circuit.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
- If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
- If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
-
If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, the following factors can be considered to be a possible cause of the problem:
- There was insufficient fuel in the tank.
- Improper fuel was used.
- The spark plugs have been contaminated.
- The problem requires further diagnosis.
- After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #4 Misfire Count).
- Be sure to confirm that no misfiring cylinder DTCs are stored again by conducting the confirmation driving pattern after finishing repairs.
- When one of Short FT B1S1 or Long FT B1S1 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be rich (-20% or less) or lean (+20% or higher).
- When Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfires have occurred only while warming up the engine.
- An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs to be stored.
- Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
| 1. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes| Result | Proceed to |
|---|---|
| DTC P0300, P0301, P0302, P0303 and/or P0304 are output | A |
| DTC P0300, P0301, P0302, P0303 and/or P0304 and other DTCs are output | B |
HINT:
If any DTCs other than P0300, P0301, P0302, P0303 and/or P0304 are output, troubleshoot those DTCs first.
| B | .gif) | GO TO DTC CHART |
|
.gif)
| 2. | CHECK PCV HOSE CONNECTIONS |
(a) Check the PCV hose connections.
Click here
OK:
PCV valve and hose are correctly connected and are not damaged.
| NG | | REPAIR OR REPLACE PCV HOSE |
|
| 3. | READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Misfire RPM and Misfire Load.
Powertrain > Engine and ECT > Data List| Tester Display |
|---|
| Misfire RPM |
| Misfire Load |
(e) Read and note the Misfire RPM and Misfire Load values.
HINT:
The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred.
|
| 4. | READ VALUE USING TECHSTREAM (CYLINDER MISFIRE COUNT) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode (maintenance mode).
Click here
| Tester Display |
|---|
| Inspection Mode |
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Cylinder #1 Misfire Count, Cylinder #2 Misfire Count, Cylinder #3 Misfire Count and Cylinder #4 Misfire Count.
Powertrain > Engine and ECT > Data List| Tester Display |
|---|
| Cylinder #1 Misfire Count |
| Cylinder #2 Misfire Count |
| Cylinder #3 Misfire Count |
| Cylinder #4 Misfire Count |
(f) Start the engine and allow the engine to idle.
(g) Read each value for Cylinder #1 Misfire Count to Cylinder #4 Misfire Count displayed on the Techstream. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.
(h) Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using Techstream (Misfire RPM And Misfire Load)" procedures above [A].
(i) Read the Cylinder #1 Misfire Count to Cylinder #4 Misfire Count or DTCs displayed on the Techstream [B].
| Result | Proceed to |
|---|---|
| Most misfires occur in only 1 or 2 cylinders | A |
| 3 cylinders or more have equal misfire counts | B |
HINT:
- If it is difficult to reproduce misfires for each cylinder, check the Data List item called Misfire Margin. Try to find vehicle driving conditions that lower the Misfire Margin value. Values above 30% are considered normal.
- If the freeze frame data record of the engine coolant temperature is less than 75°C (167°F), the misfire may be detected only when the engine is cold.
| B | | GO TO STEP 18 |
|
| 5. | INSPECT SPARK PLUG |
(a) Inspect the spark plug of the misfiring cylinder.
Click here
HINT:
Perform "Inspection After Repair" after replacing the spark plug.
Click here
| NG | | REPLACE SPARK PLUG |
|
| 6. | CHECK FOR SPARKS (SPARK TEST) |
(a) Perform a spark test.
Click here
HINT:
- If the result of the spark test is normal, proceed to the next step.
-
Perform "Inspection After Repair" after repairing or replacing the ignition system.
Click here
|
| 7. | CHECK CYLINDER COMPRESSION PRESSURE |
(a) Measure the cylinder compression pressure of the misfiring cylinder.
Click here
HINT:
Perform "Inspection After Repair" after repairing or replacing the engine assembly.
Click here
| NG | | CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION |
|
| 8. | CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40) |
| *a | Front view of wire harness connector (to ECM) |
(a) Disconnect the ECM connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C48-20 (#10) - C48-50 (E01) | Power switch on (IG) | 11 to 14 V |
| C48-17 (#20) - C48-50 (E01) | Power switch on (IG) | 11 to 14 V |
| C48-18 (#30) - C48-50 (E01) | Power switch on (IG) | 11 to 14 V |
| C48-19 (#40) - C48-50 (E01) | Power switch on (IG) | 11 to 14 V |
| NG | | CHECK FUEL INJECTOR CIRCUIT |
|
| 9. | CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER |
(a) Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor).
Click here
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
| NG | | REPLACE FUEL INJECTOR ASSEMBLY |
|
| 10. | CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks from intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
| NG | | REPAIR OR REPLACE INTAKE SYSTEM |
|
| 11. | CHECK FUEL PRESSURE |
(a) Check the fuel pressure.
Click here
| NG | | GO TO STEP 36 |
|
| 12. | READ VALUE USING TECHSTREAM (COOLANT TEMP) |
Click here
| NG | | REPLACE ENGINE COOLANT TEMPERATURE SENSOR |
|
| 13. | READ VALUE USING TECHSTREAM (MAF) |
Click here
| NG | | GO TO STEP 31 |
|
| 14. | CHECK VALVE TIMING |
Click here
| NG | | GO TO STEP 17 |
|
| 15. | PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode (maintenance mode).
Click here
| Tester Display |
|---|
| Inspection Mode |
(e) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT:
The A/C switch and all accessory switches should be off.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / MAP and Throttle Idle Position.
Powertrain > Engine and ECT > Active Test| Active Test Display |
|---|
| Control the EGR Step Position |
| Data List Display |
|---|
| MAP |
| Throttle Idle Position |
(g) Confirm that the Throttle Idle Position is ON and check the MAP values in the Data List while performing the Active Test.
HINT:
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
- Do not open the EGR valve 30 steps or more during the Active Test.
OK:
MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.
Standard:
| - | EGR Step Position (Active Test) | |
|---|---|---|
| 0 Steps | 0 to 30 Steps | |
| MAP (Data List) | (EGR valve is fully closed) | MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed |
HINT:
- While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.
- Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.
| OK | | GO TO STEP 31 |
|
| 16. | INSPECT EGR VALVE ASSEMBLY |
(a) Remove the EGR valve assembly.
Click here
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
HINT:
Perform "Inspection After Repair" after replacing the EGR valve assembly.
Click here
| OK | | GO TO STEP 31 |
| NG | | REPLACE EGR VALVE ASSEMBLY |
| 17. | CHECK ENGINE MECHANICAL SYSTEM |
(a) Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.
| OK | | GO TO STEP 31 |
| NG | | REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA |
| 18. | CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks from intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
| NG | | REPAIR OR REPLACE INTAKE SYSTEM |
|
| 19. | CHECK FUEL PRESSURE |
(a) Check the fuel pressure.
Click here
| NG | | GO TO STEP 36 |
|
| 20. | READ VALUE USING TECHSTREAM (COOLANT TEMP) |
Click here
| NG | | REPLACE ENGINE COOLANT TEMPERATURE SENSOR |
|
| 21. | READ VALUE USING TECHSTREAM (MAF) |
Click here
| NG | | GO TO STEP 31 |
|
| 22. | CHECK VALVE TIMING |
Click here
| NG | | GO TO STEP 30 |
|
| 23. | PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode (maintenance mode).
Click here
| Tester Display |
|---|
| Inspection Mode |
(e) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT:
The A/C switch and all accessory switches should be off.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / MAP and Throttle Idle Position.
Powertrain > Engine and ECT > Active Test| Active Test Display |
|---|
| Control the EGR Step Position |
| Data List Display |
|---|
| MAP |
| Throttle Idle Position |
(g) Confirm that the Throttle Idle Position is ON and check the MAP values in the Data List while performing the Active Test.
HINT:
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
- Do not open the EGR valve 30 steps or more during the Active Test.
OK:
MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.
Standard:
| - | EGR Step Position (Active Test) | |
|---|---|---|
| 0 Steps | 0 to 30 Steps | |
| MAP (Data List) | (EGR valve is fully closed) | MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed |
HINT:
- While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.
- Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.
| OK | | GO TO STEP 25 |
|
| 24. | INSPECT EGR VALVE ASSEMBLY |
(a) Remove the EGR valve assembly.
Click here
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
HINT:
Perform "Inspection After Repair" after replacing the EGR valve assembly.
Click here
| NG | | REPLACE EGR VALVE ASSEMBLY |
|
| 25. | INSPECT SPARK PLUG |
(a) Inspect the spark plug of the misfiring cylinder.
Click here
HINT:
Perform "Inspection After Repair" after replacing the spark plug.
Click here
| NG | | REPLACE SPARK PLUG |
|
| 26. | CHECK FOR SPARKS (SPARK TEST) |
(a) Perform a spark test.
Click here
HINT:
- If the result of the spark test is normal, proceed to the next step.
-
Perform "Inspection After Repair" after repairing or replacing the ignition system.
Click here
|
| 27. | CHECK CYLINDER COMPRESSION PRESSURE |
(a) Measure the cylinder compression pressure of the misfiring cylinder.
Click here
HINT:
Perform "Inspection After Repair" after repairing or replacing the engine assembly.
Click here
| NG | | CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION |
|
| 28. | CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40) |
| *a | Front view of wire harness connector (to ECM) |
(a) Disconnect the ECM connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C48-20 (#10) - C48-50 (E01) | Power switch on (IG) | 11 to 14 V |
| C48-17 (#20) - C48-50 (E01) | Power switch on (IG) | 11 to 14 V |
| C48-18 (#30) - C48-50 (E01) | Power switch on (IG) | 11 to 14 V |
| C48-19 (#40) - C48-50 (E01) | Power switch on (IG) | 11 to 14 V |
| NG | | CHECK FUEL INJECTOR CIRCUIT |
|
| 29. | CHECK FUEL INJECTOR ASSEMBLY |
(a) Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor).
Click here
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
| OK | | GO TO STEP 31 |
| NG | | REPLACE FUEL INJECTOR ASSEMBLY |
| 30. | CHECK ENGINE MECHANICAL SYSTEM |
(a) Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.
| NG | | REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA |
|
| 31. | CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) |
(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.
Click here
HINT:
Repair any problems.
|
| 32. | CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs.
Click here
(e) Turn the power switch off and wait for at least 30 seconds.
(f) Turn the power switch on (IG) and turn the Techstream on.
(g) Put the engine in inspection mode (maintenance mode).
Click here
| Tester Display |
|---|
| Inspection Mode |
(h) Start the engine and warm it up.
(i) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(j) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Powertrain > Engine and ECT > Utility| Tester Display |
|---|
| All Readiness |
(k) Input the DTC: P0300, P0301, P0302, P0303 or P0304.
(l) Check the DTC judgment result.
| Result | Proceed to |
|---|---|
| ABNORMAL (DTC P0300, P0301, P0302, P0303 and/or P0304 is output) | A |
| NORMAL (DTCs are not output) | B |
| B | | END |
|
| 33. | CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) |
Click here
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 34. | REPLACE INTAKE MASS AIR FLOW METER SUB-ASSEMBLY |
(a) Replace the mass air flow meter sub-assembly.
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HINT:
- If the results of the inspections performed in steps 13 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
-
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
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|
| 35. | CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs.
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(e) Turn the power switch off and wait for at least 30 seconds.
(f) Turn the power switch on (IG) and turn the Techstream on.
(g) Put the engine in inspection mode (maintenance mode).
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| Tester Display |
|---|
| Inspection Mode |
(h) Start the engine and warm it up.
(i) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(j) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Powertrain > Engine and ECT > Utility| Tester Display |
|---|
| All Readiness |
(k) Input the DTC: P0300, P0301, P0302, P0303 or P0304.
(l) Check the DTC judgment result.
| Result | Proceed to |
|---|---|
| NORMAL (DTCs are not output) | A |
| ABNORMAL (DTC P0300, P0301, P0302, P0303 and/or P0304 is output) | B |
| A | | END |
| B | | REPLACE ECM |
| 36. | CHECK FUEL LINE |
(a) Check the fuel lines for leaks or blockage.
HINT:
Perform "Inspection After Repair" after replacing the fuel pump.
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| OK | | REPLACE FUEL PUMP |
| NG | | REPAIR OR REPLACE FUEL LINE |
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On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS (a) Visually check that the hoses, connections and gaskets have no cracks, leaks or damage. NOTICE:
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A communication malfunction DTC may be stored.
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