Jeep Liberty KJ. Manual — part 820
•
When Monitored:
With the ignition on and the ECM EGR Air Flow Control Valve command on.
•
Set Condition:
The ECM detects excessive current on the EGR Air Flow Control Valve Control circuit.
Possible Causes
INTERMITTENT CONDITION
EGR AIR FLOW CONTROL VALVE
EGR AIR FLOW CONTROL VALVE 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 and 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.
EGR AIR FLOW CONTROL VALVE
Turn the ignition off.
Disconnect the EGR Air Flow Control Valve 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 an EGR AIR FLOW CONTROL VALVE OPEN CIRCUIT dtc?
Yes
>> Replace the EGR Air Flow Control Valve.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
9 - 1338
ENGINE DIESEL DIAG
KJ
3.
EGR AIR FLOW CONTROL VALVE SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the EGR Air Flow Control Valve 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 EGR Air Flow Control Valve Control circuit.
Is the voltage below 1.0 volt?
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 EGR Air Flow Control Valve Control circuit for a
short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1339
P2101-EGR AIR FLOW CONTROL VALVE OPEN CKT
For a complete wiring diagram Refer to Section 8W
9 - 1340
ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on and the ECM EGR Air Flow Control Valve command off.
•
Set Condition:
The ECM does not detect voltage on the EGR Air Flow Control Valve Control circuit.
Possible Causes
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
EGR AIR FLOW CONTROL VALVE CIRCUIT SHORTED TO GROUND
EGR AIR FLOW CONTROL VALVE CIRCUIT OPEN
EGR AIR FLOW CONTROL VALVE
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.
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.
ASD OUTPUT CKT OPEN
Turn the ignition off.
Disconnect the EGR Air Flow Control Valve harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay
Output circuit.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the ASD Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1341
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