## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-99

DTC P1092: Rail Pressure (RP) Control Valve Circuit Short

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 DTCs (beside DTC P1092) being output?

YES – Go to relevant DTC chart.

NO – Go to step 3.

1. Check for the following conditions:

- Damaged the fuel metering unit.

Is a problem found?

YES – Repair as necessary (Replace the fuel supply pump).

NO – Go to step 4.

1. Turn the ignition switch OFF.

1. Disconnect ECM connector.

1. Check the fuel metering unit circuit for short.

Is a problem found?

YES – Repair the fuel metering unit circuit.

NO – Go to step 7.

1. Measure the resistance of fuel metering unit as below.

Is the resistance value 2.5 – 3.2 ohms (At room temperature)?

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

NO – Replace the supply pump.

NOTICE

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

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