## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-63

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 2.

NO – Replace the APP sensor 2.

NOTICE

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

DTC P0236: Manifold Absolute Pressure (MAP) System Performance

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. Check the DTC.

Are there any other (beside DTC P0236) being output?

YES – Go to relevant DTC chart.

NO – Go to step 3.

1. Turn the ignition switch ON (II).

1. Check the MAP with the scan tool.

Is about atmospheric pressure indicated?

YES – Go to step 5.

NO – Go to step 7.

1. Start the engine at idling.

1. Check the MAP with the scan tool.

Is about 20 – 30 kPa (150 – 225 mmHg, 5.9 – 8.9 in. Hg) indicated?

YES – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the MAP sensor and at the ECM.

NO – Go to step 7.

1. Check for the following conditions:

- Damaging MAP sensor
- The vacuum hose work at the MAP sensor for leaks
- The PCV system vacuum leaks
- An incorrect PCV valve
- Vacuum leaks EGR valve flange and pipes
- Intake manifold vacuum leaks

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