Jeep Liberty KJ. Manual — part 821
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 scan tool , 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 - 1343
P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY
For a complete wiring diagram Refer to Section 8W
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ENGINE DIESEL DIAG
KJ
•
When Monitored:
With the ignition on.
•
Set Condition:
APP Sensor #1 and APP Sensor #2 signals do not agree.
Possible Causes
ACCELERATOR PEDAL POSITION SENSOR
ECM - APP SENSOR 1 5-VOLT SUPPLY CIRCUIT
SENSOR GROUND OPEN (APP SENSOR)
INTERMITTENT CONDITION
APP SENSOR 5-VOLT SUPPLY CIRCUIT OPEN
APP SENSOR SIGNAL CIRCUIT OPEN
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO SENSOR GROUND
APP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
VERIFY APP SENSOR OPERATION
APP SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
ECM - SENSOR GROUND OPEN
APP SENSOR CIRCUIT SHORTED TO VOLTAGE
APP SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
ECM - APP SENSOR SIGNAL CIRCUIT
Diagnostic Test
1.
APP SENSOR IDLE VOLTAGE
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 check-
ing for an active DTC.
NOTE: The APP Sensor is a device that contains 2 separate poten-
tiometer type sensors. Each sensor has its own 5-volt supply cir-
cuit, sensor ground circuit and signal circuit. The APP Sensor no
longer incorporates a low-idle switch.
NOTE: The APP Sensor 2 signal should always be approximately
1/2 the voltage of the APP Sensor 1 signal.
Inspect the APP Sensor for proper travel from the rest position to the
fully depressed position.
Turn the ignition on.
Using a voltmeter, backprobe the APP Sensor 1 and APP Sensor 2 Signal circuits at the APP Sensor harness con-
nector with the accelerator pedal in the at rest position.
Is the voltage between 0.42 and 0.51 volt for sensor 1 and 0.19 and 0.28 volt for sensor 2?
Yes
>> Go To 2
No
>> Go To 4
KJ
ENGINE DIESEL DIAG
9 - 1345
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