## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-103

1. 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.

1. Connect ECM connector.

1. 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

1. Turn the ignition switch ON (II).

1. 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.

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