Chrysler Pacifica. Manual — part 397

Symptom List:

PCM STATUS FAILURE
SERIAL LINK EXTERNAL FAULT

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be PCM STATUS FAILURE.

When Monitored and Set Condition:

PCM STATUS FAILURE

When Monitored:

With the ignition on.

Set Condition:

This DTC exists when a PCM STATUS message was not received from the

PCM for at least 20.0 consecutive seconds.

SERIAL LINK EXTERNAL FAULT

When Monitored:

At ignition on, after ignition on during any rolling code handshake that

occurs with the PCM due to a SKIM reset, or during SECRET KEY transfers to the PCM.

Set Condition:

When the SKIM does not receive an expected PCI BUS message trans-

mission acknowledgement from the PCM after 3 transmit attempts.

POSSIBLE CAUSES

INTERMITTENT WIRING HARNESS PROBLEM

WIRING HARNESS INSPECTION

SKREEM/PCM

TEST

ACTION

APPLICABILITY

1

NOTE: Ensure the PCM has proper power and ground connections before
continuing.
With the DRBIII

t, read and record the SKREEM DTCs then erase the SKREEM

DTCs.
Turn the ignition off.
Wait 2 minutes.
Turn the ignition on.
With the DRBIII

t, read the SKREEM DTCs.

Does the DRBIII

t display the DTC that was previously erased?

All

Yes

→ Go To 2

No

→ Go To 4

309

SKREEM

TEST

ACTION

APPLICABILITY

2

Turn the ignition off.
NOTE: Visually inspect the related wiring harness and CCD/PCI Bus
(whichever applicable) circuits. Look for any chafed, pierced, pinched, or
partially broken wires.
NOTE: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Were any problems found?

All

Yes

→ Repair as necessary.

Perform SKREEM VERIFICATION TEST - VER 1A.

No

→ Go To 3

3

NOTE: Before proceeding it will be necessary to obtain the SKREEM PIN.
Turn the ignition on.
With the DRBIII

t, display and erase all PCM and SKREEM DTC’s.

Perform 5 ignition key cycles, leaving the ignition key on for a minimum of 90 seconds
per cycle.
With the DRBIII

t, read the SKREEM DTCs.

Does the code appear?

All

Yes

→ Replace and program the Powertrain Control Module in accor-

dance with the Service Information.
Perform SKREEM VERIFICATION TEST - VER 1A.

No

→ Test Complete.

4

Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
NOTE: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Were any problems found?

All

Yes

→ Repair wiring harness/connectors as necessary.

Perform SKREEM VERIFICATION TEST - VER 1A.

No

→ Test Complete.

310

SKREEM

PCM STATUS FAILURE —

Continued

Symptom List:

ROLLING CODE FAILURE
VIN MISMATCH

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be ROLLING CODE FAILURE.

When Monitored and Set Condition:

ROLLING CODE FAILURE

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.

VIN MISMATCH

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

VERIFYING PCM VIN

REPLACE SKREEM AND CHECK DTC’S

INTERMITTENT WIRING HARNESS PROBLEM

PCM

TEST

ACTION

APPLICABILITY

1

With the DRBIII

t, erase the SKREEM DTCs.

Turn the ignition off.
Wait 10 seconds.
Turn the ignition on and wait 2 minutes.
With the DRBIII

t, read the SKREEM DTCs.

Does the DRBIII

t display the DTC that was previously erased?

All

Yes

→ Go To 2

No

→ Go To 4

311

SKREEM

TEST

ACTION

APPLICABILITY

2

Turn the ignition on.
With the DRBIII

t, 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 vehicle VIN before
continuing.
Does the VIN recorded from the PCM match the VIN of the vehicle?

All

Yes

→ Go To 3

No

→ Perform the PCM replaced to update the VIN in the PCM.

Perform SKREEM VERIFICATION TEST - VER 1A.

3

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 DRBIII

t, 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 DRBIII

t, check for SKREEM DTCs.

Does the DRBIII

t display the same DTC?

All

Yes

→ Replace and program the Powertrain Control Module in accor-

dance with the Service Information.
Perform SKREEM VERIFICATION TEST - VER 1A.

No

→ The repair is complete.

Perform SKREEM VERIFICATION TEST - VER 1A.

4

Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
NOTE: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Were any problems found?

All

Yes

→ Repair wiring harness/connectors as necessary.

Perform SKREEM VERIFICATION TEST - VER 1A.

No

→ Test Complete.

312

SKREEM

ROLLING CODE FAILURE —

Continued