Jeep XJ. Manual — part 602
TEST
ACTION
APPLICABILITY
3
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.
60
DRIVEABILITY - DIESEL
P0235-TURBOCHARGER BOOST SENSOR SUPPLY HIGH EXCEEDED —
Continued
Symptom:
P0235-TURBOCHARGER
BOOST
SENSOR
SUPPLY
LOW
EX-
CEEDED
When Monitored and Set Condition:
P0235-TURBOCHARGER BOOST SENSOR SUPPLY LOW EXCEEDED
When Monitored:
With the ignition on.
Set Condition:
The turbocharger boost pressure sensor supply voltage stays below 4.75
volts for at least 2 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
TURBOCHARGER BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5-VOLT SUPPLY AND SENSOR GROUND CIRCUITS SHORTED TOGETHER
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
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 reset?
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 4.7 volts?
All
Yes
→
Replace the Turbocharger Boost Pressure/Intake Air Tempera-
ture Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Measure the resistance between ground and the 5-volt Supply circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the 5-volt Supply circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
61
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Measure the resistance between the 5-volt Supply circuit and the Sensor Ground
circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the 5-volt Supply and Sensor Ground circuits for a short
together.
Perform ROAD TEST VERIFICATION - VER-2.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Engine Control Module in accordance
with the Service Information.
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.
62
DRIVEABILITY - DIESEL
P0235-TURBOCHARGER BOOST SENSOR SUPPLY LOW EXCEEDED —
Continued
Symptom:
P0400-EGR OPEN CIRCUIT
When Monitored and Set Condition:
P0400-EGR OPEN CIRCUIT
When Monitored:
With the ignition on.
Set Condition:
The ECM detects an open or short to ground on the electric vacuum
modulator control circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
FUSED ASD RELAY OUTPUT CIRCUIT OPEN
EGR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
EGR SOLENOID CONTROL CIRCUIT OPEN
SUBSTITUTE EGR SOLENOID
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Perform several ignition cycles, turning the ignition off for at least 10 seconds
between each ignition cycle.
Monitor the DRB for ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused ASD Relay Output
circuit.
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the Fused ASD Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
63
DRIVEABILITY - DIESEL
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