Jeep Liberty KJ. Manual — part 703
•
When Monitored:
With the ignition on.
•
Set Condition:
The Boost Pressure Sensor signal voltage is below 0.29 volt for 0.5 seconds.
Possible Causes
BOOST PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT OPEN
BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR
BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
BOOST PRESSURE SENSOR SIGNAL AND GROUND CIRCUITS SHORTED TOGETHER
BOOST PRESSURE SENSOR SIGNAL CIRCUIT OPEN
ENGINE CONTROL MODULE
Diagnostic Test
1.
READ THE BOOST PRESSURE SENSOR VOLTAGE ON THE SCAN TOOL
NOTE: If DTC P0641, P0651 or P0697 is present with this DTC,
diagnose DTCs P0641, P0651 or P0697 before diagnosing this DTC.
Turn the ignition on.
With the scan tool, read the Boost Pressure Sensor voltage.
Is the voltage below 0.2 volt?
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
KJ
2.
SENSOR REFERENCE VOLTAGE B CIRCUIT OPEN
Turn the ignition off.
Disconnect the Boost Pressure/IAT Sensor harness connector.
Turn the ignition on.
Measure the voltage between ground and the Boost Pressure Sensor
5-Volt Supply circuit.
Is the voltage above 4.9 volts?
Yes
>> Go To 3
No
>> Repair the Boost Pressure Sensor 5-Volt Supply circuit for
an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
3.
BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR
Turn the ignition off.
Disconnect the Boost Pressure/IAT Sensor harness connector.
Turn the ignition on.
Connect a jumper wire between the Boost Pressure Sensor Signal and
Boost Pressure Sensor 5-Volt Supply circuits.
With the scan tool, read the Boost Pressure Sensor voltage.
Is the Boost Pressure Sensor voltage above 4.5 volts?
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 4
KJ
ENGINE DIESEL DIAG
9 - 871
4.
BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Boost Pressure Sen-
sor Signal circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 5
No
>> Repair the Boost Pressure Sensor Signal circuit for a short
to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
5.
BOOST PRESSURE SENSOR SIGNAL AND GROUND CIRCUITS SHORTED TOGETHER
Measure the resistance between the Boost Pressure Sensor Signal cir-
cuit and Sensor Ground circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 6
No
>> Repair the Boost Pressure 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).
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ENGINE DIESEL DIAG
KJ
6.
BOOST PRESSURE SENSOR SIGNAL CIRCUIT OPEN
Measure the resistance of the Boost Pressure Sensor Signal circuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 7
No
>> Repair the Boost Pressure Sensor Signal circuit for an
open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
7.
ENGINE CONTROL MODULE
If there are no possible causes remaining, view repair.
Repair
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).
KJ
ENGINE DIESEL DIAG
9 - 873
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