Jeep Liberty KJ. Manual — part 860
P2141-EGR AIR FLOW CONTROL VALVE SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W
9 - 1398
ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on and the ECM EGR Air Flow Control Valve command off.
•
Set Condition:
The ECM detect a short to ground on the EGR Air Flow Control Valve Control circuit for 0.5 second.
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 DRB 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 DRB, erase ECM DTCs.
Test drive the vehicle.
Monitor the DRB 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 - 1399
3.
EGR AIR FLOW CONTROL VALVE SHORTED TO GROUND
Turn the ignition off.
Disconnect the EGR Air Flow Control Valve harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the EGR Air Flow Control
Valve Control circuit.
Is the resistance above 1000 ohms?
Yes
>> Go To 4
No
>> Repair the EGR Air Flow Control Valve circuit for a short to
ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
4.
EGR AIR FLOW CONTROL VALVE CIRCUIT OPEN
Turn the ignition off.
Disconnect the EGR Air Flow Control Valve harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the EGR Air Flow Control Valve Control cir-
cuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 5
No
>> Repair the EGR Air Flow Control Valve Control circuit for an
open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
KJ
5.
EGR AIR FLOW CONTROL VALVE
Turn the ignition off.
Install a substitute EGR Air Flow Control Valve in place of the vehicle’s EGR Air Flow Control Valve.
NOTE: Ensure the ECM and EGR Air Flow Control Valve harness connectors are connected.
Turn the ignition on.
With the DRB, check for this DTC to set again.
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
>> Replace the EGR Air Flow Control Valve.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1401
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