Symptom:
P1694-BUS COMMUNICATION WITH ENGINE MODULE
When Monitored and Set Condition:
P1694-BUS COMMUNICATION WITH ENGINE MODULE
When Monitored: Continuously with ignition key on.
Set Condition: If no bus messages are received from the Powertrain Control Module
(PCM) for 10 seconds. Note: Due to the integration of the Powertrain and Transmission
Control Modules, bus communication between the modules is internal.
POSSIBLE CAUSES
POWERTRAIN CONTROL MODULE
INTERMITTENT WIRING AND CONNECTORS
TEST ACTION APPLICABILITY
1 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 2
No → Go To 3
2 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 per the Service Informa-
tion. WITH THE DRBIIIt PERFORM QUICK LEARN AND
REPROGRAM PINION FACTOR.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
3 The conditions necessary to set the DTC are not present at this time.
Make sure to check for any Communication DTCs or customer concerns of possible
bus problems. This includes any other controllers on the bus on this vehicle. If there
is a bus problem refer to the Communication Category for diagnosis.
With the DRBIIIt, check the EATX EVENT DATA to help identify the conditions in
which the DTC was set.
Were there any problems found?
All
Yes → Repair as necessary.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No → Test Complete.
153
TRANSMISSION - NGC
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