Jeep Liberty KJ. Manual — part 701
2.
HIGH RESISTANCE IN THE BOOST PRESSURE SENSOR SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the Boost Pressure/IAT Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Boost Pressure Sensor Signal circuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 3
No
>> Repair the Boost Pressure Sensor Signal circuit for high
resistance.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
3.
HIGH RESISTANCE IN THE BOOST PRESSURE SENSOR GROUND CIRCUIT
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 4
No
>> Repair the Boost Pressure Sensor Ground circuit for high
resistance.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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4.
HIGH RESISTANCE IN THE BOOST PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT
Measure the resistance of the Boost Pressure Sensor 5-Volt Supply cir-
cuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 5
No
>> Repair the Boost Pressure Sensor 5-Volt Supply circuit for
high resistance.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
5.
BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR
Replace the Boost Pressure/Intake Air Temperature Sensor.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Test drive the vehicle, pausing several times to cycle the ignition.
Monitor the scan tool for ECM DTCs.
Did this DTC set again?
Yes
>> Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> The repair is complete.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
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P0235-BOOST PRESSURE SENSOR SIGNAL VOLTAGE TOO HIGH
For a complete wiring diagram Refer to Section 8W
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•
When Monitored:
With the ignition on.
•
Set Condition:
The Boost Pressure Sensor signal voltage is above 4.79 volts for 0.5 seconds.
Possible Causes
BOOST PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN
BOOST PRESSURE SENSOR
POOR CONNECTOR TERMINAL CONTACT
ENGINE CONTROL MODULE (INTERNAL)
ENGINE CONTROL MODULE (SENSOR SIGNAL SHORTED TO VOLTAGE)
Diagnostic Test
1.
CHECKING FOR CURRENT DTC
NOTE: If a P0234 or P0299 DTC is present with this DTC, diagnose P0234 or P0299 DTC before continuing.
NOTE: If DTC P0641, P0651 or P0697 is present with this DTC, diagnose DTCs P0641, P0651 or P0697 before
diagnosing this 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. Also ensure the wastegate actuator and actuator rod are attached and
functioning properly.
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)
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ENGINE DIESEL DIAG
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