Dodge Ram Truck 1500-2500-3500. Manual — part 578
ROLLING CODE FAILURE
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
At ignition on, after ignition on during any rolling code handshake that occurs with the PCM due to a SKIM or
PCM reset.
•
Set Condition:
When a PCM STATUS message with a Valid Key status is not received by the SKIM within 3.5 seconds of
transmitting the last Valid Key Code message to the PCM.
Possible Causes
WIRE HARNESS OPEN OR SHORTED
SKIM
PCM
Diagnostic Test
1.
ACTIVE DTC
With the scan tool, erase the SKIM DTCs.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on and wait 2 minutes.
With the scan tool, read the SKIM DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform SKIS VERIFICATION. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD
PROCEDURE)
2.
CORRECT VIN IN THE PCM
Turn the ignition on.
With the scan tool, select Engine system from the main menu.
Display and record the Vehicle Identification Number.
NOTE: Make sure that a VIN has been programmed into the PCM. If a VIN is not displayed, attempt to pro-
gram the PCM with the correct vehicle VIN before continuing.
Does the VIN recorded from the PCM match the VIN of the vehicle?
Yes
>> Go To 3
No
>> Perform the PCM replaced to update the VIN in the PCM.
Perform SKIS VERIFICATION. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD
PROCEDURE)
8Q - 14
VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS
DR/DH
ROLLING CODE FAILURE (CONTINUED)
3.
SKIM
Turn the ignition off.
Replace and program the Sentry Key Immobilizer Module in accordance with the Service Information.
Turn the ignition on.
With the scan tool, display and clear all PCM and SKIM DTC’s.
Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle.
With the scan tool, check for SKIM DTCs.
Does the scan tool display the same DTC?
Yes
>> Replace and program the Powertrain Control Module per Service Information.
Perform SKIS VERIFICATION. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD
PROCEDURE)
No
>> The repair is complete.
Perform SKIS VERIFICATION. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD
PROCEDURE)
DR/DH
VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS
8Q - 15
VIN MISMATCH
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
When the VIN received from the PCM does not match the VIN stored in the SKIM’s EEPROM.
Possible Causes
WIRE HARNESS OPEN OR SHORTED
SKIM
PCM
Diagnostic Test
1.
ACTIVE DTC
With the scan tool, erase the SKIM DTCs.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on and wait 2 minutes.
With the scan tool, read the SKIM DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform SKIS VERIFICATION. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD
PROCEDURE)
2.
CORRECT VIN IN THE PCM
Turn the ignition on.
With the scan tool, select Engine system from the main menu.
Display and record the Vehicle Identification Number.
NOTE: Make sure that a VIN has been programmed into the PCM. If a VIN is not displayed, attempt to pro-
gram the PCM with the correct vehicle VIN before continuing.
Does the VIN recorded from the PCM match the VIN of the vehicle?
Yes
>> Go To 3
No
>> Perform the PCM replaced to update the VIN in the PCM.
Perform SKIS VERIFICATION. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD
PROCEDURE)
8Q - 16
VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS
DR/DH
VIN MISMATCH (CONTINUED)
3.
SKIM
Turn the ignition off.
Replace and program the Sentry Key Immobilizer Module in accordance with the Service Information.
Turn the ignition on.
With the scan tool, display and clear all PCM and SKIM DTC’s.
Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle.
With the scan tool, check for SKIM DTCs.
Does the scan tool display the same DTC?
Yes
>> Replace and program the Powertrain Control Module per Service Information.
Perform SKIS VERIFICATION. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD
PROCEDURE)
No
>> The repair is complete.
Perform SKIS VERIFICATION. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD
PROCEDURE)
DR/DH
VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS
8Q - 17
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