Jeep Liberty KJ. Manual — part 759
P0602-ECM INVALID CODE WORD
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
The ECM detects an internal failure.
Possible Causes
ENGINE CONTROL MODULE
INTERMITTENT CONDITION
Diagnostic Test
1.
ENGINE CONTROL MODULE
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.
NOTE: If there are other DTC’s set with this DTC repair other DTC’s before continuing with this diagnostic
procedure.
NOTE: This code can be caused by an intermittent problem in the wiring and connectors to the Engine
Control Module. Inspect the Engine Control Module harness connector and associated wiring for signs of
poor terminal contact.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds between each engine run cycle.
With the scan tool, read the ECM DTCs.
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
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
9 - 1094
ENGINE DIESEL DIAG
KJ
P0606-ECM DEVIATION ERROR
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
The ECM detects an internal failure.
Possible Causes
ENGINE CONTROL MODULE
INTERMITTENT CONDITION
Diagnostic Test
1.
ENGINE CONTROL MODULE
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.
NOTE: If there are other DTC’s set with this DTC repair other DTC’s before continuing with this diagnostic
procedure.
NOTE: This code can be caused by an intermittent problem in the wiring and connectors to the Engine
Control Module. Inspect the Engine Control Module harness connector and associated wiring for signs of
poor terminal contact.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds between each engine run cycle.
With the scan tool, read the ECM DTCs.
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
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
KJ
ENGINE DIESEL DIAG
9 - 1095
P0606-ECM CHECKSUM ERROR
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
The ECM detects an internal failure.
Possible Causes
ENGINE CONTROL MODULE
INTERMITTENT CONDITION
Diagnostic Test
1.
ENGINE CONTROL MODULE
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.
NOTE: If there are other DTC’s set with this DTC repair other DTC’s before continuing with this diagnostic
procedure.
NOTE: This code can be caused by an intermittent problem in the wiring and connectors to the Engine
Control Module. Inspect the Engine Control Module harness connector and associated wiring for signs of
poor terminal contact.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds between each engine run cycle.
With the scan tool, read the ECM DTCs.
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
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
9 - 1096
ENGINE DIESEL DIAG
KJ
P0606-ECM INTERNAL ERROR
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
The ECM detects an internal failure.
Possible Causes
ENGINE CONTROL MODULE
INTERMITTENT CONDITION
Diagnostic Test
1.
ENGINE CONTROL MODULE
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.
NOTE: If there are other DTC’s set with this DTC repair other DTC’s before continuing with this diagnostic
procedure.
NOTE: This code can be caused by an intermittent problem in the wiring and connectors to the Engine
Control Module. Inspect the Engine Control Module harness connector and associated wiring for signs of
poor terminal contact.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds between each engine run cycle.
With the scan tool, read the ECM DTCs.
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
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
KJ
ENGINE DIESEL DIAG
9 - 1097
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