Jeep XJ. Manual — part 610
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Measure the resistance of the Intake Air Temperature Sensor Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Intake Air Temperature Sensor Signal circuit for an
open.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Connect a jumper wire between the IAT Sensor Signal and IAT Sensor Ground
circuits in the Turbocharger Boost Pressure/IAT Sensor harness connector.
Turn the ignition on.
Monitor the DRB for ECM DTCs.
Does the DRB display P1110 AIR TEMP. SENSOR SRC LOW EXCEEDED?
All
Yes
→
Replace the Turbocharger Boost Pressure/Intake Air Tempera-
ture Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Turn the ignition on.
Connect a jumper wire between the Intake Air Temperature Sensor Signal circuit
and ground.
Monitor the DRB for ECM DTCs.
Does the DRB display P1110 AIR TEMP. SENSOR SRC LOW EXCEEDED?
All
Yes
→
Repair the Intake Air Temperature Sensor Ground circuit for an
open.
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
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.
92
DRIVEABILITY - DIESEL
P1110-AIR TEMP. SENSOR SRC HIGH EXCEEDED —
Continued
Symptom:
P1110-AIR TEMP. SENSOR SRC LOW EXCEEDED
When Monitored and Set Condition:
P1110-AIR TEMP. SENSOR SRC LOW EXCEEDED
When Monitored:
With the ignition on.
Set Condition:
The intake air temperature sensor signal goes below 0.18 volt for at least
2 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
INTAKE AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
TURBOCHARGER BOOST PRESSURE/IAT SENSOR
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Monitor the DRB for ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
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 Intake Air Temperature Sensor
Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Intake Air Temperature Sensor Signal circuit for a
short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the Turbocharger Boost Pressure/IAT Sensor harness connector.
Turn the ignition on.
Monitor the DRB for ECM DTCs.
Does the DRB display P1110 AIR TEMP. SENSOR SRC HIGH EXCEEDED?
All
Yes
→
Replace the Turbocharger Boost Pressure/Intake Air Tempera-
ture Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
93
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
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.
5
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.
94
DRIVEABILITY - DIESEL
P1110-AIR TEMP. SENSOR SRC LOW EXCEEDED —
Continued
Symptom:
P1201-NEEDLE MOVEMENT SENSOR SRC HIGH EXCEEDED
When Monitored and Set Condition:
P1201-NEEDLE MOVEMENT SENSOR SRC HIGH EXCEEDED
When Monitored:
With the ignition on.
Set Condition:
The ECM detects high voltage on the needle movement sensor signal
circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
NEEDLE MOVEMENT SENSOR GROUND CIRCUIT OPEN
NEEDLE MOVEMENT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
NEEDLE MOVEMENT SENSOR
NEEDLE MOVEMENT SENSOR SIGNAL CIRCUIT OPEN
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 ECM harness connectors.
Disconnect the Needle Movement Sensor harness connector.
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 on the Needle Movement Sensor Signal circuit.
Is the voltage below 0.5 volt?
All
Yes
→
No
→
Repair the Needle Movement Sensor Signal circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
NOTE: Remove the jumper wire.
95
DRIVEABILITY - DIESEL
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