Dodge Dakota (R1). Manual — part 122
Symptom List:
P0600-PCM FAILURE SPI COMMUNICATIONS - DIESEL
P0601-PCM INTERNAL CONTROLLER FAILURE - DIESEL
P1696-PCM FAILURE EEPROM WRITE DENIED
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0600-PCM FAILURE SPI
COMMUNICATIONS - DIESEL.
POSSIBLE CAUSES
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: This DTC indicates an internal PCM problem.
View repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
23
COMMUNICATION
Symptom:
P1687-NO CLUSTER BUS MESSAGE - DIESEL
When Monitored and Set Condition:
P1687-NO CLUSTER BUS MESSAGE - DIESEL
When Monitored:
With the ignition on.
Set Condition:
The PCM has not received an expected Cluster Status Bus message from
the instrument cluster within the last 20 seconds.
POSSIBLE CAUSES
CHECK CLUSTER COMMUNICATION
PCI BUS CIRCUIT OPEN
PCM - INTERNAL FAILURE
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB III, erase PCM DTCs.
Cycle the ignition key on and off several times, leaving the key on for at least 10
seconds at a time.
With the DRB III, read PCM DTCs.
Did this DTC reset?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRB III, attempt to communicate with the Instrument Cluster.
Can the DRB III communicate with the Instrument Cluster?
All
Yes
→
No
→
Refer to COMMUNICATION for the related symptom(s).
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Instrument Cluster harness connector.
Measure the resistance of the PCI Bus circuit between the PCM harness connector
and the Instrument Cluster harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the PCI Bus circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
24
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running and at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
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.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
25
COMMUNICATION
P1687-NO CLUSTER BUS MESSAGE - DIESEL —
Continued
Symptom:
*NO RESPONSE FROM ECM - DIESEL ONLY
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE PCM
CHECK ECM POWERS AND GROUNDS
SCI TRANSMIT CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB attempt to communicate with the PCM.
Was the DRB able to communicate with the PCM?
All
Yes
→
No
→
Refer to symptom list for problems related to No Response From
ECM and PCM.
Perform ROAD TEST VERIFICATION - VER-2.
2
Perform the symptom Checking ECM and PCM Power and Ground Circuits in the
Driveability category.
Did the vehicle pass this test?
All
Yes
→
No
→
Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance of the SCI Transmit circuit between the ECM connector and
the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
Replace and the Engine Control Module in accordance with the
Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the SCI Transmit circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
26
COMMUNICATION
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