## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-94

DTC P1087: Rail Pressure (RP) High

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 (beside DTC P1807) being output?

YES – Go to relevant DTC chart.

NO – Go to step 3.

1. Disconnect ECM connector.

1. Measure the resistance of RP sensor as below.

- Between terminal 86 and 90.

Is there 0.9 – 1.3 ohms? (At indoor temperature)

YES – Go to step 5.

NO – Go to step 8.

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 – Go to step 7.

1. Check for the following conditions:

- Damaged supply pump.
- Damaged common rail.
- Damaged fuel metering unit.
- Fuel leaks injection pipes.
- Damaged the RP sensor.

Is a problem found?

YES – Repair as necessary.

NO – Go to step 8.

1. Turn the ignition switch OFF.

1. Disconnect the RP sensor 3P connector terminals No.1 and No.2 with a jumper wire.

Wire side of female terminals

RP sensor 3P connector

JUMPER WIRE

a a a