DTC P0102 [MZR-CD (RF Turbo)]


DTC P0102	MAF sensor circuit low input
DETECTION CONDITION	• PCM monitors input voltage from MAF sensor while engine is running. If input voltage from MAF sensor is below 0.2 V, PCM determines MAF sensor circuit low input.
POSSIBLE CAUSE	• MAF sensor malfunction • Connector or terminal malfunction • Open circuit in wiring between PCM control relay terminal C and MAF/IAT sensor terminal A • Short to GND in wiring between MAF/IAT sensor terminal C and PCM terminal 9 • MAF sensor signal and GND circuits short each other • Open circuit in wiring between MAF/IAT sensor terminal C and PCM terminal 9 • PCM malfunction


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform "DTC Confirmation Procedure". (See DTC CONFIRMATION PROCEDURE [MZR-CD (RF Turbo)].) • Is same DTC present during KOEO or KOER self-test?	Yes	Go to next step.
1		No	Intermittent concern exists. Go to "Intermittent Concern Troubleshooting". (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR-CD (RF Turbo)].)
2	INSPECT POOR CONNECTION OF MAF SENSOR CONNECTOR • Turn engine switch to OFF. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair or replace suspected terminal, go to Step 9.
2		No	Go to next step.
3	INSPECT MAF SENSOR POWER CIRCUIT FOR OPEN • Turn engine switch to ON. (Engine OFF) • Inspect voltage at MAF/IAT sensor terminal A (harness side). • Is voltage below 1.0 V?	Yes	Repair or replace harness for open, go to Step 9.
3		No	Go to next step.
4	INSPECT MAF SENSOR SIGNAL CIRCUIT FOR SHORT TO GND • Turn engine switch to OFF. • Inspect continuity between MAF/IAT sensor terminal C and body GND. • Is there continuity?	Yes	Repair or replace harness for short to GND, go to Step 9.
4		No	Go to next step.
5	INSPECT MAF SENSOR CIRCUIT FOR SHORT WITH EACH OTHER • Turn engine switch to OFF. • Inspect continuity between MAF/IAT sensor terminals C and B. • Is there continuity?	Yes	Repair or replace harness for short with each other, go to Step 9.
5		No	Go to next step.
6	INSPECT MAF SENSOR • Inspect MAF sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [MZR-CD (RF Turbo)].) • Is there any malfunction?	Yes	Replace MAF/IAT sensor, go to Step 9. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
6		No	Go to next step.
7	INSPECT POOR CONNECTION OF PCM CONNECTOR • Turn engine switch to OFF. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction?	Yes	Repair or replace suspected terminal, go to Step 9.
7		No	Go to next step.
8	INSPECT MAF SENSOR SIGNAL CIRCUIT FOR OPEN • Turn engine switch to OFF. • Inspect continuity between MAF/IAT sensor terminal C and PCM terminal 9. • Is there continuity?	Yes	Go to next step.
8		No	Repair or replace harness for open, go to next step.
9	VERIFY TROUBLESHOOTING OF DTC P0102 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from PCM memory using WDS or equivalent. • Perform KOEO/KOER self-test. (See KOEO/KOER SELF-TEST PROCEDURE [MZR-CD (RF Turbo)].) • Is same DTC present?	Yes	Replace PCM, go to next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
9		No	Go to next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Is there any DTC present?	Yes	Go to applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
10		No	Troubleshooting completed.