- DTC judgment completed
- System normal
Lexus NX: Ignition Coil "A" Primary / Secondary Circuit (P0351-P0354)
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Ignition Coil "A" Primary / Secondary Circuit (P0351-P0354)
DESCRIPTION
HINT:
- These DTCs indicate malfunctions relating to the primary circuit.
- If DTC P0351 is output, check the No. 1 ignition coil assembly (No. 1 cylinder) circuit.
- If DTC P0352 is output, check the No. 2 ignition coil assembly (No. 2 cylinder) circuit.
- If DTC P0353 is output, check the No. 3 ignition coil assembly (No. 3 cylinder) circuit.
- If DTC P0354 is output, check the No. 4 ignition coil assembly (No. 4 cylinder) circuit.
A Direct Ignition System (DIS) is used on this vehicle.
The DIS is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil assembly and one spark plug is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is applied directly to each spark plug. The spark of the spark plugs passes from the center electrode to the ground electrodes.
The ECM determines the ignition timing and transmits the ignition (IGT) signals to each cylinder. Using the IGT signal, the ECM turns the power transistor inside the igniter on and off. The power transistor, in turn, switches the current supplied to the primary coil on and off. When the current to the primary coil is cut off, a powerful voltage is generated in the secondary coil. This voltage is applied to the spark plugs, causing them to spark inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back an ignition confirmation (IGF1) signal to the ECM, for each cylinder ignition.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0351 | Ignition Coil "A" Primary / Secondary Circuit | No IGF1 signal to ECM while the engine is running (1 trip detection logic). |
| Comes on | DTC stored |
| P0352 | Ignition Coil "B" Primary / Secondary Circuit | No IGF1 signal to ECM while the engine is running (1 trip detection logic). |
| Comes on | DTC stored |
| P0353 | Ignition Coil "C" Primary / Secondary Circuit | No IGF1 signal to ECM while the engine is running (1 trip detection logic). |
| Comes on | DTC stored |
| P0354 | Ignition Coil "D" Primary / Secondary Circuit | No IGF1 signal to ECM while the engine is running (1 trip detection logic). |
| Comes on | DTC stored |
Reference: Inspection using an oscilloscope
HINT:
While idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF1 and E1 of the ECM connector.
| ECM Terminal Name | IGT: Between IGT (1 to 4) and E1 IGF: Between IGF1 and E1 |
| Tester Range | 2 V/DIV., 20 ms./DIV. |
| Condition | Idling with warm engine |
MONITOR DESCRIPTION
If the ECM does not receive any IGF1 signals despite transmitting the IGT signal, it interprets this as a fault in the igniter and stores a DTC.
MONITOR STRATEGY
| Related DTCs | P0351: Igniter (cylinder 1) circuit/open P0352: Igniter (cylinder 2) circuit/open P0353: Igniter (cylinder 3) circuit/open P0354: Igniter (cylinder 4) circuit/open |
| Required Sensors/Components (Main) | Igniter (Cylinder 1 to 4) |
| Required Sensors/Components (Related) | Crankshaft position sensor |
| Frequency of Operation | Continuous |
| Duration | - |
| MIL Operation | Immediate |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Monitor runs whenever the following DTCs are not stored | None |
| All of the following conditions are met | - |
| Spark cut | Not operating |
| Either of the following conditions is met | A or B |
| A. Starter | Off |
| B. Engine speed | 1500 rpm or less |
| Either of the following conditions is met | C or D |
| C. Both of the following conditions are met | - |
| Engine speed | 500 rpm or less |
| Auxiliary battery voltage | 6 V or higher |
| D. All of the following conditions are met | - |
| Engine speed | Higher than 500 rpm |
| Auxiliary battery voltage | 10 V or higher |
| Number of sparks after CPU is reset | 5 sparks or more |
| Lost communication with hybrid vehicle control ECU (U0293) | Not detected |
| Hybrid control module judge | Engine running |
TYPICAL MALFUNCTION THRESHOLDS
| All of the following conditions are met | A, B, C and D |
| A. Ignition signal fail counter | More than 2 times |
| B. Time after condition A is met | 0.256 seconds or more |
| C. Ignition signal fail counter after condition B is met | More than 2 times |
| D. Power switch | On (IG) |
COMPONENT OPERATING RANGE
| Confirmed ignition signal input | 2 times or more |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for at least 30 seconds.
- Turn the power switch on (IG) and turn the Techstream on.
-
Put the engine in inspection mode (maintenance mode).
Click here
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- Start the engine.
- Idle the engine for 10 seconds or more [A].
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
-
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P0351, P0352, P0353 or P0354.
-
Check the DTC judgment result.
Techstream Display
Description
NORMAL
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
-
If no pending DTC is output, perform a universal trip and check for permanent DTCs.
Click here
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
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. | READ OUTPUT DTCS (DTC P0351, P0352, P0353 OR P0354) |
(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) Shuffle the arrangement of the ignition coil assemblies (among No. 1 to No. 4 cylinders).
NOTICE:
Do not change the location of the connectors.
(g) Perform a simulation test.
(h) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(i) Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes| Result | Proceed to |
|---|---|
| Same DTC output | A |
| Different ignition coil DTC output | B |
HINT:
Perform "Inspection After Repair" after replacing the ignition coil assembly.
Click here
| B | .gif) | REPLACE IGNITION COIL ASSEMBLY |
|
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| 2. | CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND) |
(a) Disconnect the ignition coil assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C9-4 (GND) - Body ground | Always | Below 1 Ω |
| C8-4 (GND) - Body ground | Always | Below 1 Ω |
| C7-4 (GND) - Body ground | Always | Below 1 Ω |
| C6-4 (GND) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL ASSEMBLY) |
| *a | Front view of wire harness connector (to Ignition Coil Assembly) |
(a) Disconnect the ignition coil assembly 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 |
|---|---|---|
| C9-1 (+B) - C9-4 (GND) | Power switch on (IG) | 11 to 14 V |
| C8-1 (+B) - C8-4 (GND) | Power switch on (IG) | 11 to 14 V |
| C7-1 (+B) - C7-4 (GND) | Power switch on (IG) | 11 to 14 V |
| C6-1 (+B) - C6-4 (GND) | Power switch on (IG) | 11 to 14 V |
| NG | | GO TO STEP 5 |
|
| 4. | CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM) |
(a) Disconnect the ignition coil assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C9-3 (IGT1) - C48-57 (IGT1) | Always | Below 1 Ω |
| C8-3 (IGT2) - C48-56 (IGT2) | Always | Below 1 Ω |
| C7-3 (IGT3) - C48-55 (IGT3) | Always | Below 1 Ω |
| C6-3 (IGT4) - C48-54 (IGT4) | Always | Below 1 Ω |
| C9-2 (IGF) - C48-51 (IGF1) | Always | Below 1 Ω |
| C8-2 (IGF) - C48-51 (IGF1) | Always | Below 1 Ω |
| C7-2 (IGF) - C48-51 (IGF1) | Always | Below 1 Ω |
| C6-2 (IGF) - C48-51 (IGF1) | Always | Below 1 Ω |
| C9-3 (IGT1) or C48-57 (IGT1) - Body ground | Always | 10 kΩ or higher |
| C8-3 (IGT2) or C48-56 (IGT2) - Body ground | Always | 10 kΩ or higher |
| C7-3 (IGT3) or C48-55 (IGT3) - Body ground | Always | 10 kΩ or higher |
| C6-3 (IGT4) or C48-54 (IGT4) - Body ground | Always | 10 kΩ or higher |
| C9-2 (IGF) or C48-51 (IGF1) - Body ground | Always | 10 kΩ or higher |
| C8-2 (IGF) or C48-51 (IGF1) - Body ground | Always | 10 kΩ or higher |
| C7-2 (IGF) or C48-51 (IGF1) - Body ground | Always | 10 kΩ or higher |
| C6-2 (IGF) or C48-51 (IGF1) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE ECM |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 5. | CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - IG2-MAIN RELAY) |
(a) Disconnect the ignition coil assembly connector.
(b) Remove the IG2-MAIN relay from the No. 1 engine room relay block and junction block assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C9-1 (+B) - 5 (IG2-MAIN relay) | Always | Below 1 Ω |
| C8-1 (+B) - 5 (IG2-MAIN relay) | Always | Below 1 Ω |
| C7-1 (+B) - 5 (IG2-MAIN relay) | Always | Below 1 Ω |
| C6-1 (+B) - 5 (IG2-MAIN relay) | Always | Below 1 Ω |
| C9-1 (+B) or 5 (IG2-MAIN relay) - Body ground | Always | 10 kΩ or higher |
| C8-1 (+B) or 5 (IG2-MAIN relay) - Body ground | Always | 10 kΩ or higher |
| C7-1 (+B) or 5 (IG2-MAIN relay) - Body ground | Always | 10 kΩ or higher |
| C6-1 (+B) or 5 (IG2-MAIN relay) - Body ground | Always | 10 kΩ or higher |
| OK | | GO TO ECM POWER SOURCE CIRCUIT |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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