Jeep Liberty KJ. Manual — part 660
•
When Monitored:
With the ignition on and the ECM Boost Pressure Solenoid command on.
•
Set Condition:
The ECM detects excessive current on the Boost Pressure Solenoid Control circuit.
Possible Causes
BOOST PRESSURE SOLENOID
BP SOLENOID CONTROL SHORTED TO VOLTAGE
ENGINE CONTROL MODULE - INTERNAL SHORT TO VOLTAGE
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.
Test drive the vehicle.
Monitor the scan tool for 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.
BP SOLENOID CONTROL SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the BP Solenoid harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage of the BP Solenoid Control circuit.
Is the voltage below 1.0 volt?
Yes
>> Go To 3
No
>> Repair the BP Solenoid Control circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
9 - 698
ENGINE DIESEL DIAG
KJ
3.
BOOST PRESSURE SOLENOID
Turn the ignition off.
Disconnect the BP Solenoid harness connector.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Monitor the scan tool for ECM DTCs.
Does the scan tool display P0045 BOOST PRESSURE SOLENOID OPEN CIRCUIT?
Yes
>> Replace the Boost Pressure Solenoid.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 699
P0047-TURBOCHARGER BOOST PRESSURE SOLENOID SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W
9 - 700
ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on and the Boost Pressure Solenoid command off.
•
Set Condition:
The Engine Control Module (ECM) detects that the (X653) Boost Pressure Solenoid Control circuit is shorted
to ground for 5.3 seconds.
Possible Causes
(X653) BOOST PRESSURE SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
(X653) BOOST PRESSURE SOLENOID CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
BOOST PRESSURE SOLENOID
ENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the Boost Pressure Solenoid.
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
(X653) BOOST PRESSURE SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Boost Pressure Solenoid connector.
Disconnect the Engine Control Module (ECM) connector.
Measure the resistance between ground and the (X653) Boost Pressure
Solenoid Control circuit in the Boost Pressure Solenoid harness connec-
tor.
Is the resistance below 1000 ohms?
Yes
>> Repair the (X653) Boost Pressure Solenoid Control circuit
for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 3
KJ
ENGINE DIESEL DIAG
9 - 701
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