- DTC judgment completed
- System normal
Lexus NX: Manifold Absolute Pressure Circuit Problem (P0106)
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Manifold Absolute Pressure Circuit Problem (P0106)
DESCRIPTION
The manifold absolute pressure sensor detects pressure inside the intake manifold as an absolute pressure with a built-in sensor and outputs it as voltage. Based on the voltage from the manifold absolute pressure sensor, the ECM controls the purge VSV and corrects any errors in the air fuel ratio due to change in pressure.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0106 | Manifold Absolute Pressure Circuit Problem | Intake manifold pressure measured after engine start drops by less than 2 kPa(abs) [15 mmHg(abs)] compared to the intake manifold pressure (atmospheric pressure) measured before engine start (2 trip detection logic). |
| Comes on | DTC stored |
MONITOR DESCRIPTION
When the intake manifold pressure measured after engine start drops by less than 2 kPa(abs) [15 mmHg(abs)] compared to the intake manifold pressure (atmospheric pressure) measured before engine start, the ECM interprets this as a malfunction in the manifold absolute pressure sensor and stores DTC P0106.
MONITOR STRATEGY
| Related DTCs | P0106: Manifold absolute pressure sensor stuck |
| Required Sensors/Components (Main) | Manifold absolute pressure sensor |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Continuous |
| Duration | 6 seconds |
| MIL Operation | 2 driving cycles |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Monitor runs whenever the following DTCs are not stored | P0010 (Camshaft timing oil control valve) P0011 (VVT system - advance) P0012 (VVT system - retard) P0016 (VVT system - misalignment) 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 engine coolant temperature for closed loop fuel control) P0335 (Crankshaft position sensor) P0340 (Camshaft position sensor) P0401 (EGR system) P106A (Evaporative emission control system pressure sensor - manifold pressure sensor correlation) |
| Auxiliary battery voltage | 10.5 V or higher |
| Engine coolant temperature | 30°C (86°F) or higher |
| Intake air temperature | -10°C (14°F) or higher |
| Engine speed | 1000 rpm or higher |
| Throttle valve | Close |
| EGR valve | Close |
| Atmospheric pressure | 76 kPa(abs) [570 mmHg(abs)] or higher |
TYPICAL MALFUNCTION THRESHOLDS
| Difference between manifold absolute pressure sensor and atmospheric pressure | More than -2 kPa [-15 mmHg (abs)] |
COMPONENT OPERATING RANGE
| Difference between manifold absolute pressure sensor and atmospheric pressure | -2 kPa [-15 mmHg (abs)] or less |
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 and warm it up until the engine coolant temperature reaches 73°C (163°F) or higher.
- Move the shift lever to N.
- 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: P0106.
-
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.
CAUTION / NOTICE / HINT
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. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0106) |
(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 P0106 is output | A |
| DTC P0106 and other DTCs are output | B |
HINT:
If any DTCs other than P0106 are output, troubleshoot those DTCs first.
| B | .gif) | GO TO DTC CHART |
|
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| 2. | READ VALUE USING TECHSTREAM (MAP) |
(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 / Primary / MAP.
Powertrain > Engine and ECT > Data List| Tester Display |
|---|
| MAP |
(e) Read the MAP value.
(f) Put the engine in inspection mode (maintenance mode).
Click here
(g) Start the engine.
(h) Read the MAP value at idling.
Standard:
| Engine Condition | Techstream Display |
|---|---|
| Power switch on (IG) | 80 to 110 kPa(abs) [600 to 825 mmHg(abs)] |
| Idling | 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] |
| OK | | CHECK FOR INTERMITTENT PROBLEMS |
|
| 3. | CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks in intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
| OK | | REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR |
| NG | | REPAIR OR REPLACE INTAKE SYSTEM |
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