DTC P0154:00 [MZR-CD 2.2]

id0102f3147200

DTC P0154:00

A/F sensor circuit no activity detected
DETECTION CONDITION
•  The PCM monitors oxygen density using A/F sensor when the ignition switch to the ON position. The difference in oxygen density between atmosphere and A/F sensor value is more than 35 % for 7 sec., the PCM determines that the A/F sensor is not activated.
Monitoring condition
―  Following conditions are met:
•  Battery voltage: 11—16 V
•  Engine speed: more than 800 rpm
•  Fuel system loop status is closed loop
Diagnostic support note
•  The MIL illuminates if the PCM detects the above malfunction condition in first drive cycle.
•  PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA is available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  Engine coolant leakage
•  A/F sensor looseness
•  Exhaust gas leakage from exhaust manifold
•  Intermittent open or short circuit between PCM terminal 2AF and A/F sensor terminal A
•  Intermittent open or short circuit between PCM terminal 2AE and A/F sensor terminal B
•  A/F sensor malfunction
―  A/F sensor deterioration
•  Insufficient compression
•  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.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform the 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.
3
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
•  Is DTC P0154:00 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to troubleshooting procedures for DTC in FREEZE FRAME DATA.
(See DTC TABLE [MZR-CD 2.2].)
4
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 inspection results, then go to Step 10.
No
Go to the next step.
5
INSPECT INSTALLATION OF A/F SENSOR
•  Inspect if the A/F sensor is loosely installed.
•  Is the sensor installed securely?
Yes
Go to the next step.
No
Install A/F sensor securely, then go to Step 10.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
6
INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM
•  Visually inspect if there is any gas leakage between the exhaust manifold and A/F sensor.
•  Is there gas leakage?
Yes
Repair or replace any malfunctioning exhaust part, then go to Step 10.
No
Go to the next step.
7
INSPECT A/F SENSOR
•  Inspect A/F sensor.
•  Is the A/F sensor normal?
Yes
Go to the next step.
No
Inspect the following wiring harnesses for an open or short circuit, repair or replace the wiring harness if necessary.
•  A/F sensor terminal A (wiring harness-side) to PCM terminal 2AF (wiring harness-side)
•  A/F sensor terminal B (wiring harness-side) to PCM terminal 2AE (wiring harness-side)
If all items above are normal, replace A/F sensor.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
Then go to Step 10.
8
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is it normal?
Yes
Go to the next step.
No
Perform engine overhaul for repairs, then go to Step 10.
9
VERIFY WHETHER MALFUNCTION IS A/F SENSOR OR ELSEWHERE
•  Make sure to reconnect all disconnected connectors.
•  Switch the ignition to ON (Engine off).
•  Clear the DTC from memory using the M-MDS.
•  Perform the Repair Verification Drive Mode.
•  Is the PENDING CODE for this DTC present?
Yes
Replace the A/F sensor, 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 TROUBLESHOOTING OF DTC P0154:00 COMPLETED
•  Switch the ignition to ON (Engine off).
•  Clear the DTC from memory using the M-MDS.
•  Perform the Repair Verification Drive Mode.
•  Is the PENDING CODE for this DTC present?
Yes
Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM.
(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 DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR-CD 2.2])
No
Troubleshooting completed.