DTC P0154:00 [MZR-CD 2.2]

id0102f3147200

DTC P0154:00

A/F sensor circuit no activity detected
DETECTION CONDITION
•  The PCM monitors the oxygen density using the A/F sensor while decelerating. The difference in the oxygen density between atmosphere and A/F sensor value is more than 35 % for 7 s, the PCM determines that the A/F sensor is not activated.
MONITORING CONDITIONS
―  Battery voltage: 11—16 V
―  Engine speed: 800 rpm or more
―  A/F sensor loop status is closed loop.
Diagnostic support note
•  The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  A/F sensor looseness
•  Engine coolant leakage
•  Exhaust gas leakage from exhaust manifold
•  Intermittent short or open circuit between the following terminals:
―  A/F sensor terminal A—PCM terminal 2AF
―  A/F sensor terminal B—PCM terminal 2AE
•  A/F sensor malfunction
―  A/F sensor deterioration
•  Insufficient engine compression
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2)
•  Perform the Freeze Frame PID Data Access Procedure.
•  Is the DTC P0154:00 on FREEZE FRAME DATA (Mode 2)?
Yes
Go to the next step.
No
Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2).
(See DTC TABLE [MZR-CD 2.2].)
2
VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
3
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
4
INSPECT INSTALLATION OF A/F SENSOR
•  Inspect if the A/F sensor is loosely installed.
•  Is the A/F sensor installed securely?
Yes
Go to the next step.
No
Retighten the A/F sensor, then go to Step 10.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
5
INSPECT SEALING OF ENGINE COOLANT PASSAGE
•  Perform the “ENGINE COOLANT LEAKAGE INSPECTION”.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 10.
No
Go to the next step.
6
INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM
•  Visually inspect for the exhaust gas leakage between exhaust manifold and A/F sensor.
•  Is there any leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 10.
No
Go to the next step.
7
INSPECT A/F SENSOR
•  Inspect the A/F sensor.
•  Is there any malfunction?
Yes
Inspect for short or open circuit between the following terminals (wiring harness-side):
•  A/F sensor terminal A—PCM terminal 2AF
•  A/F sensor terminal B—PCM terminal 2AE
―  If there is any malfunction:
•  Repair or replace the suspected wiring harness.
―  If there is no malfunction:
•  Replace the A/F sensor.
Go to Step 10.
No
Go to the next step.
8
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is there any malfunction?
Yes
Overhaul the engine for repairs, then go to Step 10.
No
Go to the next step.
9
VERIFY WHETHER MALFUNCTION IS A/F SENSOR OR ELSEWHERE
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the Repair Verification Drive Mode.
•  Is the same DTC present?
Yes
Replace the A/F sensor, then go to the next step.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
No
Go to the next step.
10
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the Repair Verification Drive Mode.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZR-CD 2.2].)
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR-CD 2.2].)
No
DTC troubleshooting completed.