Jeep Liberty KJ. Manual — part 676
6.
INLET PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT HIGH RESISTANCE
Measure the resistance of the Inlet Pressure Sensor 5-volt Supply cir-
cuit.
Is the resistance below 10.0 ohms?
Yes
>> Replace the Inlet Pressure Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Inlet Pressure Sensor 5 Volt Supply circuit for
high resistance.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
KJ
P0105-INLET PRESSURE SENSOR SIGNAL VOLTAGE TOO HIGH
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
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•
When Monitored:
With the ignition on.
•
Set Condition:
The Inlet Pressure Sensor signal is above 4.75 volts for 2.0 seconds.
Possible Causes
INTERMITTENT CONDITION
INLET PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
INLET PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
INLET PRESSURE SENSOR GROUND CIRCUIT OPEN
INLET PRESSURE SENSOR
ENGINE CONTROL MODULE (INTERNAL)
ENGINE CONTROL MODULE (SENSOR SIGNAL SHORTED TO VOLTAGE)
Diagnostic Test
1.
CHECKING FOR CURRENT 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.
NOTE: Ensure all turbocharger inlet and outlet tubes are connected properly, without damage and restric-
tion before continuing with this test.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Cycle the ignition key on and off several times, leaving the key on for at least 10 seconds at a time.
With the scan tool, read ECM DTCs.
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.
MEASURE THE INLET PRESSURE SENSOR SIGNAL CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the Inlet Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage between ground and the Inlet Pressure Sensor
Signal circuit.
Is the voltage above 1.0 volt?
Yes
>> Go To 3
No
>> Go To 4
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ENGINE DIESEL DIAG
KJ
3.
INLET PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Inlet Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay.
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 Inlet Pressure Sensor
Signal circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the Inlet Pressure Sensor Signal circuit for a short to
voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> 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).
4.
INLET PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Inlet Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay.
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 Inlet Pressure Sensor
Ground circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the Inlet Pressure Sensor Ground circuit for a short
to voltage. The ECM will need to be checked for proper
operation before the repair is completed. A short to voltage
on a ground circuit can damage the ECM.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 5
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ENGINE DIESEL DIAG
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