DTC P0151 [MZR-CD (RF Turbo)]

id0102f1817700

DTC P0151

A/F sensor circuit low input

DETECTION CONDITION

•  The PCM monitors the input signal from the A/F sensor. If the voltage from the A/F sensor is less than 0.4 V, the PCM determines that there is a malfunction in the A/F sensor circuit.

Diagnostic support note

•  The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.

•  FREEZE FRAME DATA is available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  A/F sensor malfunction

•  Connector or terminal malfunction

•  Short to ground in wiring harness between A/F sensor terminal B and PCM terminal 85

•  PCM malfunction

DTC P0151	A/F sensor circuit low input
DETECTION CONDITION	• The PCM monitors the input signal from the A/F sensor. If the voltage from the A/F sensor is less than 0.4 V, the PCM determines that there is a malfunction in the A/F sensor circuit. Diagnostic support note • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• A/F sensor malfunction • Connector or terminal malfunction • Short to ground in wiring harness between A/F sensor terminal B and PCM terminal 85 • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the M-MDS to the DLC-2. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Is the same DTC present?	Yes	Go to the next step.
3		No	Intermittent concern exists. Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”. (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD (RF Turbo)].)
4	INSPECT A/F SENSOR CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the A/F sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
4		No	Go to the next step.
5	INSPECT A/F SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND • Turn the engine switch off. • Disconnect the A/F sensor connector. • Inspect for continuity between A/F sensor terminal B (wiring harness-side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 8.
5		No	Go to the next step.
6	INSPECT A/F SENSOR • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction?	Yes	Replace the A/F sensor, then go to Step 8. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
6		No	Go to the next step.
7	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to the next step.
7		No	Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0151 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the Repair Verification Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
9		No	DTC troubleshooting completed.