## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-64

Is a problem found? YES – Repair as necessary. NO – Go to step 8.

1. Turn the ignition switch OFF.

1. Disconnect the MAP sensor 3P connector terminals No. 1 and No. 3 with a jumper wire.

Wire side of female terminals

MAP sensor 3P connector

JUMPER WIRE

1. Turn the ignition switch ON (II).

1. Check the MAP with the scan tool.

Is about 250 kPa (1,877 mmHg, 73 in. Hg) indicated?

YES – Replace the MAP sensor.

NO – Go to step 12.

1. Disconnect ECM connector.

1. Check the MAP sensor signal circuit, +5 V circuit and ground circuit for open/short to ground.

Wire side of female terminals

MAP sensor 3P connector

JUMPER WIRE

Wire side of female terminals

MAP sensor 3P connector

JUMPER WIRE

Is a problem found?

YES – Replace the MAP sensor circuit.

NO – Go to step 14.

1. 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.

a a a