Dodge Ram. Manual — part 109
Symptom:
PCI BUS INTERNAL FAILURE
When Monitored and Set Condition:
PCI BUS INTERNAL FAILURE
When Monitored:
Continuous
Set Condition:
The Instrument Cluster fails the loopback test on the PCI Bus.
POSSIBLE CAUSES
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
NOTE: If this is an active DTC, answer yes to the question.
With the DRBIII
t, erase DTCs.
Cycle the ignition and wait approximately 1 minute.
With the DRBIII
t, read DTCs.
Did this DTC reset?
All
Yes
→ Replace the Instrument Cluster in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
433
INSTRUMENT CLUSTER
Symptom:
PCM MESSAGES NOT RECEIVED
When Monitored and Set Condition:
PCM MESSAGES NOT RECEIVED
When Monitored:
With the ignition on.
Set Condition:
The MIC does not receive any messages from the PCM for at least 5
seconds.
POSSIBLE CAUSES
PCM MESSAGES NOT RECEIVED
ATTEMPT TO COMMUNICATE WITH THE PCM
PCI BUS CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: To proceed in this test, the DTC must be active.
With the DRB, enter SYSTEM MONITORS then J1850 MODULE SCAN.
Is the PCM active on the BUS?
All
Yes
→ Check the condition of the J1850 Bus circuit wiring. Erase DTC,
if DTC resets replace the Instrument Cluster in accordance with
the service information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition on.
With the DRB, attempt to communicate with the PCM.
Was the DRB able to communicate with the PCM?
All
Yes
→ Go To 3
No
→ Refer to the communication category and perform the appropriate
symptom.
Perform BODY VERIFICATION TEST - VER 1.
434
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the PCM harness connector.
CAUTION: If NGC, DO NOT PROBE THE PCM HARNESS CONNECTORS.
PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM
TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION.
INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Disconnect the DRBIII
t from the DLC.
Measure the resistance of the PCI Bus circuit between the PCM connector (from
special tool #8815 if NGC) and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace and program the Powertrain Control Module in accor-
dance with the service information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
435
INSTRUMENT CLUSTER
PCM MESSAGES NOT RECEIVED —
Continued
Symptom:
PRNDL SWITCH INPUT CIRCUIT OPEN (DIESEL ONLY)
When Monitored and Set Condition:
PRNDL SWITCH INPUT CIRCUIT OPEN (DIESEL ONLY)
When Monitored:
With the ignition on.
Set Condition:
The instrument Cluster detects that an open condition exists in the
PRNDL circuit.
POSSIBLE CAUSES
TRANSMISSION RANGE SENSOR
TRS MUX CIRCUIT OPEN
TRANSMISSION RANGE SENSOR 5 VOLT SUPPLY CIRCUIT OPEN
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure that the correct Instrument Cluster is installed and is
correctly configured for the vehicle.
Turn the ignition off.
Disconnect the Transmission Range Sensor harness connector.
Connect a jumper wire between cavity 2 and cavity 5.
Turn the ignition on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PRNDL Switch Input Circuit Shorted?
All
Yes
→ Replace the Transmission Range Sensor in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Transmission Range Sensor harness connector.
Disconnect the Instrument Cluster C3 harness connector.
Measure the resistance of the Transmission Range Sensor MUX circuit.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Transmission Range Sensor MUX circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
436
INSTRUMENT CLUSTER
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