DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 69 / 284

Symptom:
P0235-BOOST PRESSURE SENSOR SUPPLY VOLTAGE TOO HIGH
OR LOW
When Monitored and Set Condition:
P0235-BOOST PRESSURE SENSOR SUPPLY VOLTAGE TOO HIGH OR LOW
When Monitored: With the ignition on.
Set Condition: The Sensor Reference Voltage B voltage to the Boost Pressure Sensor is
below 4.8 volts or above 5.2 volts for at least 100 ms.
POSSIBLE CAUSES
INTERMITTENT CONDITION
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
SENSOR REFERENCE VOLTAGE B CIRCUIT SHORTED TO GROUND
SENSOR REFERENCE VOLTAGE B CIRCUIT SHORTED TO SENSOR GROUND
SENSOR REFERENCE VOLTAGE B CIRCUIT SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 NOTE: If DTC P0641 or P0651 is present with this DTC, diagnose DTCs
P0641 and P0651 before diagnosing this DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Turn the ignition off, wait 30 seconds, then turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC set again? All
Yes
→
Go To 2
No
→
Go To 7
2 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 Sensor Reference Voltage B circuit at
the Boost Pressure Sensor harness connector.
Is the voltage above 1.0 volt? All
Yes
→
Repair the Sensor Reference Voltage B circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 3
61
DRIVEABILITY - DIESEL
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