DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 70

DRIVEABILITY - DIESEL
P0235-BOOST PRESSURE SENSOR SUPPLY VOLTAGE TOO HIGH OR
LOW —
Continued
TEST
3 Turn the ignition off.
Disconnect the Boost Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Sensor Reference Voltage B circuit
at the Boost Pressure Sensor harness connector.
Is the resistance above 1000 ohms?
Yes → Go To 4
→ Repair the Sensor Reference Voltage B circuit for a short to
No
4 Turn the ignition off.
Disconnect the Boost Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the Sensor Ground circuit and the Sensor Reference
Voltage B circuit at the Boost Pressure Sensor harness connector.
Is the resistance above 1000 ohms?
Yes → Go To 5
→ Repair the Sensor Reference Voltage B circuit for a short to the
No
5 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the 5-volt Supply circuit at the APP
Sensor harness connector.
Is the resistance above 1000 ohms?
Yes → Go To 6
→ Repair the APP Sensor 5-volt Supply circuit for a short to ground.
No
6 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage between ground and the 5-volt Supply circuit at the APP Sensor
harness connector.
Is the voltage above 1.0 volt?
Yes → Repair the APP Sensor 5-volt Supply circuit for a short to voltage.
→ Replace and program the Engine Control Module in accordance
No
ACTION
ground.
Perform ROAD TEST VERIFICATION - VER-2.
Sensor Ground circuit.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
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APPLICABILITY
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