Jeep Wrangler TJ. Manual — part 170
Symptom:
P1687-NO COMMUNICATION WITH THE MIC
When Monitored and Set Condition:
P1687-NO COMMUNICATION WITH THE MIC
When Monitored:
Continuously with engine running.
Set Condition:
The code sets in approximately 25 seconds if no BUS messages are
received from the MIC.
POSSIBLE CAUSES
OTHER BUS PROBLEMS PRESENT
INTERMITTENT WIRING AND CONNECTORS
MIC - NO COMMUNICATION
TRANSMISSION CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, Check the STARTS SINCE SET counter for P1687.
Note: This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter set at 0?
All
Yes
→ Go To 2
No
→ Go To 5
2
With the DRBIII
t, 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 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 3
3
Ignition on, engine not running.
With the DRBIII
t, clear all DTC’s.
Start the engine in park.
With the DRBIII
t, read the MIC DTC’s.
Can the DRBIII
t communicate with the MIC?
All
Yes
→ Go To 4
No
→ Refer to the Communication category and perform the appropri-
ate symptom related to No Response to MIC.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
405
TRANSMISSION - 42RLE
TEST
ACTION
APPLICABILITY
4
Ignition on, engine not running.
With the DRBIII
t, erase TCM DTC’s.
Start the engine in park.
With the DRBIII
t, read Transmission DTC’s.
Is the DTC, P1687- No Communication with the MIC, present?
All
Yes
→ Replace the Transmission Control Module per the Service Infor-
mation. WITH THE DRBIII
t PERFORM QUICK LEARN.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Test Complete.
5
The conditions necessary to set this 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 while checking for shorts and open circuits.
With the DRBIII
t, 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 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Test Complete.
406
TRANSMISSION - 42RLE
P1687-NO COMMUNICATION WITH THE MIC —
Continued
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 for
10 seconds.
POSSIBLE CAUSES
NO COMMUNICATION WITH PCM
OTHER BUS PROBLEMS PRESENT
INTERMITTENT WIRING AND CONNECTORS
TRANSMISSION CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, Check the STARTS SINCE SET counter for P1694.
Note: This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter for P1694 set to 0?
All
Yes
→ Go To 2
No
→ Go To 5
2
With the DRBIII
t, 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 Communication category and perform the appropri-
ate symptom.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 3
3
Ignition on, engine not running.
With the DRBIII
t, attempt to communicate with the Powertrain Control Module
(PCM).
Can the DRBIII
t communicate with the PCM?
All
Yes
→ Go To 4
No
→ Refer to the Communication category and perform the appropri-
ate symptom.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
407
TRANSMISSION - 42RLE
TEST
ACTION
APPLICABILITY
4
Ignition on, engine not running.
With the DRBIII
t, erase TCM DTC’s.
Start the engine in park.
With the DRBIII
t, read Transmission DTC’s.
Did the DTC, P1694, return?
All
Yes
→ Replace the Transmission Control Module per the Service Infor-
mation. WITH THE DRBIII
t PERFORM QUICK LEARN.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 5
5
The conditions necessary to set this 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 while checking for shorts and open circuits.
With the DRBIII
t, 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 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Test Complete.
408
TRANSMISSION - 42RLE
P1694-BUS COMMUNICATION WITH ENGINE MODULE —
Continued
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