## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-57

DTC P0192: Rail Pressure (RP) Sensor 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. Check the DTC.

Are there other DTCs P1627, P1618 (beside DTC P0192) being output?

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

NO – Go to step 3.

1. Check for the following conditions:

- Damage to the RP sensor.

Is a problem found?

YES – Repair as necessary.

NO – Go to step 4.

1. Turn the ignition switch OFF.

1. Disconnect ECM connector.

1. Measure the resistance of RP sensor as below.

- Between terminal 86 and 90.

Is there about 0.9 – 1.3 Kohms (At room temperature: about 20°C (68°F))?

YES – Go to step 7.

NO – Go to step 9.

1. Turn the engine ON at idling.

1. Check the RP sensor signal voltage.

Is about 1 V indicated?

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

NO – Replace the RP sensor.

1. Disconnect the RP sensor 3P connector.

1. Check the RP sensor signal circuit for short.

   Turn the ignition switch ON (II).

Is a problem found?

YES – Repair the RP sensor signal circuit for short.

NO – Go to step 11.

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