Mass Airflow Sensor: MPV
- Voltage Inspection
Disconnect PCM 104-pin harness connector. Connect 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Turn ignition on, engine off. Measure voltage between breakout box terminals No. 36 and 88. See MAF SENSOR VOLTAGE SPECIFICATIONS table. If voltage reading is as specified, go to next step. If voltage reading is not as specified, go to step 3. - Start engine and warm up completely. Measure voltage between breakout box terminals No. 36 and 88. See MAF SENSOR VOLTAGE SPECIFICATIONS table. If voltage reading is not as specified, go to next step.
- Open Circuit Inspection
Using DVOM, check for continuity between following terminals:- MAF/IAT sensor 6-pin harness connector terminal "B" and main relay 4-pin harness connector terminal "C" (White/Red wire).
- MAF/IAT sensor 6-pin harness connector terminal "D" and 104-pin breakout box terminal No. 36 (Gray wire).
- MAF/IAT sensor 6-pin harness connector terminal "E" and 104-pin breakout box terminal No. 88 (Blue/White wire).
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.
- Short Circuit Inspection
Check for continuity between following:- MAF/IAT sensor 6-pin harness connector terminal "B" (White/red wire) and ground.
- MAF/IAT sensor 6-pin harness connector terminal "D" (Gray wire) and power supply.
- MAF/IAT sensor 6-pin harness connector terminal "E" (Blue/White wire) and power supply.
- MAF/IAT sensor 6-pin harness connector terminal "E" (Blue/White wire) and ground.
If continuity is present, repair short circuit in suspect wire or replace wire harness.