- Check the MAF sensor B+ circuit for an open, or short to ground.
Wire side of female terminals
MAF/IAT sensor 5P connector
JUMPER WIRE
Is a problem found?
YES – Repair the MAF B+ circuit. 
NO – Go to step 11.
- Connect ECM connector.
- Connect the MAF sensor 5P connector terminals No. 4 and No. 5 with a jumper wire.
Wire side of female terminals
MAF/IAT sensor 5P connector
JUMPER WIRE
- Turn the ignition switch ON (II).
- Check the MAF with the scan tool.
Is about 225 g/sec (811 kg/h) indicated?
YES – Replace the IAT/MAF sensor.
NO – Substitute a known good ECM and recheck. If symptom/indication goes away, replace the original ECM.
| NOTICE |
The battery power supply short circuit to 5 V power supply damages the ECM.