DTC P0154 [MZR-CD (RF Turbo)]

id0102f1008600

DTC P0154 | A/F sensor circuit no activity detected
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DETECTION CONDITION | • The PCM monitors oxygen density using A/F sensor when the engine switch to the ON position. The difference in oxygen density between atmosphere and A/F sensor value is more than 35 %, the PCM determines that the A/F sensor is not activated. Diagnostic support note • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA is available. • 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 93 and A/F sensor terminal A • Intermittent open or short circuit between PCM terminal 85 and A/F sensor terminal B • A/F sensor malfunction ― A/F sensor deterioration • Insufficient compression • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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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 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 (RF Turbo)].)
4 | INSPECT SEALING OF ENGINE COOLANT PASSAGE • Perform the ENGINE COOLANT LEAKAGE INSPECTION. (See ENGINE COOLANT LEAKAGE INSPECTION [MZR-CD (RF Turbo)].) • 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 (RF Turbo)].)
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. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR-CD (RF Turbo)].) • 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 93 (wiring harness-side) • A/F sensor terminal B (wiring harness-side) to PCM terminal 85 (wiring harness-side) If all items above are normal, replace A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].) Then go to Step 10.
8 | INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [MZR-CD (RF Turbo)].) • 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. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • 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 (RF Turbo)].)
No | Go to the next step.
10 | VERIFY TROUBLESHOOTING OF DTC P0154 COMPLETED • Switch the ignition to ON (Engine off). • Clear the DTC from memory using the M-MDS. • Perform the Repair Verification Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • 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 (RF Turbo)])
No | Go to the next step.
11 | VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure”. (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Are any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)])
No | Troubleshooting completed.