## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-97

1. Check the RP sensor signal circuit, +5 V circuit for open.

Is a problem found?

YES – Repair the RP sensor signal or +5 V circuit.

NO – Go to step 11.

1. Check the RP sensor signal voltage.

Is about 5 V indicated?

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

NO – Go to step 12.

1. Turn the ignition switch OFF.

1. Measure the resistance of RP sensor.

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

YES – Go to step 14.

NO – Replace the RP sensor.

1. Recheck the DTC P1088 troubleshooting.

Was a problem completed ohm?

YES – System is OK.

NO – Replace the supply pump.

NOTICE

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

a a a