Jeep Liberty KJ. Manual — part 662
5.
ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure
Solenoid and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Replace the Engine Control Module (ECM) in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
9 - 706
ENGINE DIESEL DIAG
KJ
P0070-AMBIENT AIR TEMPERATURE SIGNAL VOLTAGE TOO HIGH
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 707
•
When Monitored:
With the ignition on.
•
Set Condition:
The Ambient Air Temperature Sensor signal is above 4.82 volts for 0.5 second.
Possible Causes
AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
AMBIENT AIR TEMP SENSOR GROUND CIRCUIT OPEN
AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT OPEN
AMBIENT TEMPERATURE SENSOR
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.
Turn the ignition off for 10 seconds.
Turn the ignition on.
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.
AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor 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 on the Ambient Air Temperature Sensor Signal cir-
cuit.
NOTE: Remove the jumper wire.
Is the voltage below 1.0 volt?
Yes
>> Go To 3
No
>> Repair the Ambient Air Temperature Sensor Signal circuit
for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
9 - 708
ENGINE DIESEL DIAG
KJ
3.
AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Ambient Air Temperature Sensor harness connector.
Measure the resistance of the Ambient Air Temperature Sensor Signal
circuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 4
No
>> Repair the Ambient Air Temperature Sensor Signal circuit
for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
4.
AMBIENT TEMPERATURE SENSOR
Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Connect a jumper wire between the Ambient Temperature Sensor Signal and Sensor Ground circuits in the Ambient
Temperature Sensor harness connector.
Turn the ignition on.
Monitor the scan tool for ECM DTCs.
Does the scan tool display P0070 AMB TEMP. SENSOR CIRCUIT SIGNAL VOLTAGE TOO LOW?
Yes
>> Replace the Ambient Temperature Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 5
5.
AMBIENT TEMP SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Ambient temperature Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit between the ECM
harness connector and the Ambient Temperature Sensor harness con-
nector.
Is the resistance below 10.0 ohms?
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 Ambient Air Temperature Sensor Ground circuit
for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 709
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст