Jeep XJ. Manual — part 600
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Boost Pressure Sensor Ground circuit for high resis-
tance.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the 5-volt Supply circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the 5-volt Supply circuit for high resistance.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Replace the Turbocharger Boost Pressure/Intake Air Temperature Sensor.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle, pausing several times to cycle the ignition.
Monitor the DRB for ECM DTCs.
Did this DTC reset?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
The repair is complete.
Perform ROAD TEST VERIFICATION - VER-2.
6
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
52
DRIVEABILITY - DIESEL
P0235-TURBOCHARGER BOOST SENSOR PLAUSIBILITY —
Continued
Symptom:
P0235-TURBOCHARGER BOOST SENSOR SIGNAL HIGH EX-
CEEDED
When Monitored and Set Condition:
P0235-TURBOCHARGER BOOST SENSOR SIGNAL HIGH EXCEEDED
When Monitored:
With the ignition on.
Set Condition:
The turbocharger boost pressure sensor signal voltage exceeds 4.80 volts
for at least 2 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN
BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
TURBOCHARGER BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR
POOR CONNECTOR TERMINAL CONTACT
ENGINE CONTROL MODULE (5-VOLT SUPPLY SHORTED TO VOLTAGE)
ENGINE CONTROL MODULE (INTERNAL)
ENGINE CONTROL MODULE (SENSOR SIGNAL SHORTED TO VOLTAGE)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, read the Turbocharger Boost Pressure Sensor voltage.
Is the voltage above 4.5 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Turn the ignition on.
Measure the voltage between ground and the Turbocharger Boost Pressure Sensor
5-volt Supply circuit.
Is the voltage above 5.2 volts?
All
Yes
→
No
→
53
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Measure the voltage between ground and the 5-volt Supply circuit.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the 5-volt Supply circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT 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?
All
Yes
→
No
→
5
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
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?
All
Yes
→
Repair the Boost Pressure Sensor Signal circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Boost Pressure Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
54
DRIVEABILITY - DIESEL
P0235-TURBOCHARGER BOOST SENSOR SIGNAL HIGH EXCEEDED —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
NOTE: Ensure all harness connectors are connected.
Turn the ignition on.
Measure the voltage of the Boost Pressure Sensor Signal circuit by backprobing ECM
harness connector C1, cavity 40.
Is the voltage above 4.5 volts?
All
Yes
→
Replace the Turbocharger Boost Pressure/Intake Air Tempera-
ture Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
8
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC reset?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Ensure good terminal contact between the Turbocharger Boost
Pressure/IAT Sensor harness connector and the sensor. The
repair is complete.
Perform ROAD TEST VERIFICATION - VER-2.
9
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
55
DRIVEABILITY - DIESEL
P0235-TURBOCHARGER BOOST SENSOR SIGNAL HIGH EXCEEDED —
Continued
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