Symptom:
P1652-SERIAL COMMUNICATION LINK MALFUNCTION
When Monitored and Set Condition:
P1652-SERIAL COMMUNICATION LINK MALFUNCTION
When Monitored: Continuously with engine running.
Set Condition: The DTC sets in approximately 20 seconds if no BUS messages are
received by the TCM. Note: Due to the integration of the Powertrain and Transmission
Control Modules, bus communication between the modules is internal.
POSSIBLE CAUSES
ENGINE COMMUNICATION DTCS PRESENT
POWERTRAIN CONTROL MODULE
INTERMITTENT WIRING AND CONNECTORS
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read Engine DTC’s.
Are there any Engine Communication DTC’s present?
All
Yes → Refer to the Powertrain category and perform the appropriate
symptom.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No → Go To 2
2 With the DRBIIIt, erase Transmission DTC’s.
Start the Engine in Park.
With the DRBIIIt, read Transmission DTCs.
NOTE: The Engine must run for at least 20 seconds to reset this DTC.
Did the DTC reset after the engine was started?
All
Yes → Go To 3
No → Go To 4
3 Using the schematics as a guide, inspect the wiring and connectors. Repair as
necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module. WITH THE DRBIIIt
PERFORM QUICK LEARN AND REPROGRAM PINION FAC-
TOR.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
146
TRANSMISSION - NGC
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