## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-117

DTC P1238: Boost Pressure Control Circuit Low Voltage

1. Check the ''On Board Diagnostic (OBD) System Check''.

Was the ''OBD System Check'' performed?

YES – Go to step 2.

NO – Go to OBD System Check.

1. Turn the ignition switch OFF.

1. Check for the following conditions:

- Damaged turboactuator or EVRV.

- EVRV wire harness and connector.

Is a problem found?

YES – Repair as necessary.

NO – Go to step 4.

1. Disconnect the EVRV connector.

1. Turn the ignition switch ON (II).

1. Measure voltage between the EVRV 2P connector terminals No. 1 and body ground.

Wire side of female terminals

Is there B+?

YES – Go to step 7.

NO – Repair open in the wire between EVRV and the main relay.

1. Turn the ignition switch OFF.

1. Disconnect the ECM A connector.

1. Check the circuit between EVRV connector No. 2 terminal and ECM A connector terminal No. 17 for open.

Wire side of female terminals

Injector 2P connector

JUMPER WIRE

Is a problem found?

YES – Repair open in the wire between EVRV and the ECM.

NO – Go to step 10.

1. Measure resistance between the EVRV 2P connector terminals No. 1 and No. 2.

Is there 14.7 – 16.1 ohms (20°C (68°F)) (At room temperature)?

YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.

NO – Replace the EVRV.

NOTICE

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

a a a