B1A28-ECM MISMATCH WITH SKIM

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:
A valid key is recognized but the programmed VIN does not match between the WCM and PCM.

Possible Causes

VERIFYING PCM VIN

REPLACE SKREEM AND CHECK DTCS

INTERMITTENT WIRING HARNESS PROBLEM

PCM

Diagnostic Test

1. DETERMINING IF DTC IS CURRENT

With the scan tool, erase the SKREEM DTCs.
Turn the ignition off.
Wait 10 seconds.
Turn the ignition on and wait 2 minutes.
With the scan tool, read the SKREEM DTCs.

Does the scan tool display the DTC that was previously erased?

Yes

Go To 2

Go To 4

2. VERIFYING THE PCM VIN

Turn the ignition on.
With the scan tool, select Engine system from the main menu.
Display and record the Vehicle Identification Number.

NOTE: Ensure that a VIN has been programmed into the PCM. If a VIN is not displayed, attempt to program the PCM with the correct VIN before continuing.

Does the VIN recorded from the PCM match the VIN of the vehicle?

Yes

Go To 3

Using the scan tool perform the PCM Replace procedure to update the VIN in the PCM.
Perform SKREEM VERIFICATION TEST

3. REPLACE SKREEM AND CHECK DTC'S

Turn the ignition off.
Replace and program the Sentry Key Remote Entry Module in accordance with the Service Information.
Turn the ignition on.
With the scan tool, display and clear all PCM and SKREEM DTC's.
Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle.
With the scan tool, check for SKREEM DTCs.

Does the scan tool display the same DTC?

Yes

Replace and program the Powertrain Control Module in accordance with the Service Information.
Perform SKREEM VERIFICATION TEST

The repair is complete.
Perform SKREEM VERIFICATION TEST

4. INTERMITTENT

Turn the ignition off.

NOTE: Check for the following conditions:

Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.

Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Refer to any Technical Service Bulletins (TSB) that may apply.

Were any problems found?

Yes

Repair wiring harness/connectors as necessary.
Perform SKREEM VERIFICATION TEST

Test Complete.