TEST ACTION APPLICABILITY
3 With the DRBIIIt, check all of the other modules on the vehicle for evidence of a
vehicle bus problem.
Bus related DTC’s in other modules point to an overall vehicle bus problem. Other
symptoms such as a customer complaint of intermittent operation of bus controlled
features also indicate a bus problem.
Does the PRNDL display indicate 9No Bus9 or is there any evidence of an overall
vehicle bus problem?
All
Yes → Refer to the Communications category and perform the appropri-
ate symptom.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No → Go To 4
4 Ignition on, engine not running.
With the DRBIIIt, clear all DTC’s.
Start the engine in park.
NOTE: May take up to 30 seconds of a consistent fault to set this DTC.
With the DRBIIIt, read the BCM DTC’s.
Does the Body Control Module have a 9MIC MESSAGES NOT RECEIVED9 DTC?
All
Yes → Refer to the Communications category and perform test for 9MIC
MESSAGES NOT RECEIVED9.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No → Go To 5
5 Ignition on, engine not running.
With the DRBIIIt, erase Transmission DTC’s.
Start the engine in park.
With the DRBIIIt, read Transmission DTC’s.
Is the DTC 9P1687 NO COMMUNICATION WITH THE MIC9 present?
All
Yes → Replace the Powertrain Control Module. WITH THE DRBIIIt
PERFORM QUICK LEARN AND REPROGRAM PINION FAC-
TOR.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No → Test Complete.
6 The conditions necessary to set the DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring and connectors while checking for shorts and open circuits.
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.
152
TRANSMISSION - NGC
P1687-NO COMMUNICATION WITH THE MIC — Continued
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