## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-108

DTC P1108: BARO Sensor Circuit High Voltage

1. Check the ''On Board Diagnostic (OBD) System Check''.

Was the ''OBD System Check'' performed?

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

NO – Go to OBD System Check.

DTC P1195: Rail Pressure (RP) Sensor Supply Voltage High/Low

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 P1195) being output?

YES – Go to DTC P1627, P1628 chart (5V reference #2 circuit failure).

NO – Go to step 3.

1. Check the following conditions:

- Damaging 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 ohms (At room temperature: about 20°C (68°F))?

YES – Go to step 7.

NO – Go to step 9.

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