## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-62

DTC P0228: Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

1. Check the DTC.

Are there other DTCs P1627, P1618 (beside DTC P1228) being output?

YES – Go to DTC P1627, P1618 chart (5 V reference #2 circuit failure)

NO – Go to step 2.

1. Check for the following conditions:

- Damaging APP sensor
- An incorrect APP sensor fixing
- Damaging accelerator pedal

Is a problem found?

YES – Repair as necessary.

NO – Go to step 3.

1. Turn the ignition switch ON (II).

1. Check the APP with the scan tool.

Is about 0 % indicated?

YES – Go to step 5.

NO – Go to step 6.

1. Press the accelerator pedal.

Is about 0 (Idle) – 100 % (WOT) indicated?

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

NO – Go to step 6.

1. Turn the ignition switch OFF.

1. Disconnect the APP sensor 6P connector.

1. Turn the ignition switch ON (II).

1. Measure voltage between the APP sensor 6P connector terminals No. 4 and No. 6.

(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 79 and 81.

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.

a a a