DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 64

DRIVEABILITY - DIESEL
P0235-BOOST PRESSURE SENSOR SIGNAL VOLTAGE TOO HIGH —
Continued
TEST
3 Turn the ignition off.
Disconnect the Boost Pressure 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.
Is the voltage above 1.0 volt?
Yes → Repair the 5-volt Supply circuit for a short to voltage.
→ Replace and program the Engine Control Module in accordance
No
4 Turn the ignition off.
Disconnect the Boost Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage between ground and the Boost Pressure Sensor Signal circuit.
Is the voltage above 1.0 volt?
Yes → Go To 5
→ Go To 6
No
5 Turn the ignition off.
Disconnect the Boost Pressure 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 Boost Pressure Sensor Signal circuit.
Is the voltage above 1.0 volt?
Yes → Repair the Boost Pressure Sensor Signal circuit for a short to
→ Replace and program the Engine Control Module in accordance
No
6 Turn the ignition off.
Disconnect the Boost Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 5.0 ohms?
Yes → Go To 7
→ Repair the Boost Pressure Sensor Ground circuit for an open.
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
56
APPLICABILITY
All
All
All
All