PR25DD engine
- CHECK HARNESS CONNECTOR
- Disconnect MAF sensor harness connector and ECM harness connector.
- Connect MAF sensor harness connector and ECM harness connector.
- Perform DTC Confirmation Procedure. DTC Description
Is DTC detected?
YES
GO TO 2.
NO
INSPECTION END
- CHECK MAF SENSOR POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect mass air flow (MAF) sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between MAF sensor harness connector and ground.
+
-
Voltage
MAF sensor
Connector
Terminal
F31
1
Ground
5 V
Is the inspection result normal?
YES
GO TO 4.
NO
GO TO 3.
- CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Perform Refer to Diagnosis Procedure .
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK MAF SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between MAF sensor harness connector and ECM harness connector.
+
-
Continuity
MAF sensor
ECM
Connector
Terminal
Connector
Terminal
F31
3
F91
23
Existed
Is the inspection result normal?
YES
GO TO 5.
NO
Repair or replace error-detected parts.
- CHECK MAF SENSOR INPUT SIGNAL CIRCUIT
- Check the continuity between MAF sensor harness connector and ECM harness connector.
+
-
Continuity
MAF sensor
ECM
Connector
Terminal
Connector
Terminal
F31
2
F91
26
Existed
- Also check harness for short to ground and to power.
Is the inspection result normal?
YES
GO TO 6.
NO
Repair open circuit or short to ground or short to power in harness or connectors.
- Check the continuity between MAF sensor harness connector and ECM harness connector.
- CHECK MAF SENSOR
Check the MAF sensor. Refer to Component Inspection .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Inspection .
NO
Replace mass air flow sensor. Refer to AIR CLEANER AND AIR DUCT : Exploded View .