Jeep Grand Cherokee WK. Manual — part 1133
U1418-IMPLAUSIBLE RIGHT WHEEL DISTANCE SIGNAL RECEIVED
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ENGINE ELECTRICAL DIAGNOSTICS
WK
U1418-IMPLAUSIBLE RIGHT WHEEL DISTANCE SIGNAL RECEIVED (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on.
•
Set Condition:
The PCM gets an implausible signal over the CAN C circuit from the ABS Module. The circuit is continuously
monitored.
Possible Causes
VEHICLE SPEED SENSOR FAULT ACTIVE IN ANTI-LOCK BRAKE MODULE
CAN C BUS CIRCUIT SHORTED
CAN C BUS CIRCUIT OPEN
ABS MODULE
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Theory of Operation
The ABS Module sends an implausible distance signal over the CAN C Bus circuit to the PCM.
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the U1418-IMPLAUSIBLE RIGHT WHEEL DISTANCE SIGNAL RECEIVED active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
ABS MODULE IS ACTIVE ON THE CAN C BUS
With the scan tool, select ECU View.
Verify that the ABS Module active on the bus.
Is the ABS Module active on the bus?
Yes
>> Go To 3
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No
Response diagnostic procedures.
Perform BODY VERIFICATION TEST – VER 1.
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ENGINE ELECTRICAL DIAGNOSTICS
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U1418-IMPLAUSIBLE RIGHT WHEEL DISTANCE SIGNAL RECEIVED (CONTINUED)
3.
DTCS STORED OR ACTIVE IN THE ABS MODULE
Check for DTCs in the ABS Module.
Are any DTCs active or stored in the ABS Module?
Yes
>> Refer to section 5 - BRAKES - ABS ELECTRICAL DIAGNOSTICS and perform the diagnostics for the
DTCs in the ABS Module.
Perform ABS VERIFICATION TEST – VER 1
No
>> Go to 4
4.
ACTIVE DTCS IN THE FCM
With the scan tool, select ECU View and select FCM.
With the scan tool, read active DTCs.
Are any Communication DTCs active in the FCM relating to the ABS System?
Yes
>> Replace the ABS Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
*5.7L INTERMITTENT NO CRANK CONDITION
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Possible Causes
ETC STARTER INHIBIT
Diagnostic Test
1.
ETC STARTER INHIBIT
NOTE: This 5.7L engine will try to relearn ETC position when the key is left in the on position for an
extended period of time and will not allow the starter to crank during this procedure. This procedure can
take up to 2.5 seconds.
To verify the cause of the no crank condition or delayed crank use the scan tool, and read the ETC Starter Inhibit
mileage.
The controller will store the mileage at which the no start condition occurred because of the ETC testing procedure.
This is considered normal operation for a vehicle equipped with an Electronic Throttle Control System and no
repairs are necessary.
Is a mileage stored under the ETC Starter Inhibit?
Yes
>> Test Complete.
No
>> Refer to the appropriate diagnostic procedure for further assistance if any other DTC’s are set.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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