## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-111

1. Turn the ignition switch ON (II).

1. Measure voltage between the APP sensor 6P connector terminals No. 1 and No. 2.

(For example; Right handle)

Wire side of female terminals

Is there about 5 V?

YES – Go to step 11.

NO – Go to step 10.

1. Measure voltage between the ECM connector terminals A 76 and 78.

Is there about 5 V?

YES – Repair open in the wire between ECM and the APP sensor.

NO – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.

1. Check the APP sensor signal circuit for short.

Is a problem found?

YES – Repair open in the signal wire between ECM and the APP sensor 1.

NO – Replace the APP sensor 1.

NOTICE

The battery power supply short circuit to 5 V power supply damages the ECM.

a a a