Jeep Liberty KJ. Manual — part 679
5.
SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the Sensor Ground circuit between the ECM
harness connector and the Boost Pressure Sensor harness connector.
Is the resistance below 10.0 ohms?
Yes
>> Replace and program the Engine Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
KJ
P0110-INTAKE AIR TEMP SENSOR SIGNAL VOLTAGE TOO LOW
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 775
•
When Monitored:
With the ignition on.
•
Set Condition:
The Intake Air Temperature Sensor signal is below 0.45 volt.
Possible Causes
INTERMITTENT CONDITION
INTAKE AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
INTAKE AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
BOOST PRESSURE/IAT SENSOR
ENGINE CONTROL MODULE
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions
under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the
DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may
assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Monitor the scan tool for ECM DTCs for at least 2 minutes.
Did this DTC set again?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
BOOST PRESSURE/IAT SENSOR
Turn the ignition off.
Disconnect the Boost Pressure/IAT Sensor harness connector.
Turn the ignition on.
Monitor the scan tool for ECM DTCs for at least 2 minutes.
Does the scan tool display P0110 INTAKE AIR TEMP SIGNAL
VOLTAGE TOO HIGH?
Yes
>> Replace the Boost Pressure/Intake Air Temperature Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
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ENGINE DIESEL DIAG
KJ
3.
INTAKE AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Boost Pressure/IAT Sensor harness connector.
Measure the resistance between ground and the Intake Air Temperature
Sensor Signal circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 4
No
>> Repair the Intake Air Temperature Sensor Signal circuit for
a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
4.
INTAKE AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO
SENSOR GROUND
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Boost Pressure/IAT Sensor harness connector.
Measure the resistance between the Intake Air Temperature Sensor Sig-
nal circuit and the Sensor Ground circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 5
No
>> Repair the Intake Air Temperature Sensor Signal circuit for
a short to the Sensor Ground circuit.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
5.
ENGINE CONTROL MODULE
If there are no possible causes remaining, view repair.
Repair
Replace and program the Engine Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 777
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