Jeep XJ. Manual — part 553
Symptom:
*CMTC BUTTONS INOPERATIVE
POSSIBLE CAUSES
CMTC - BUTTONS STUCK ON
CMTC - BUTTONS INOPERATIVE
TEST
ACTION
APPLICABILITY
1
Using the DRBIII
t in Compass/Mini Trip, Inputs/Outputs, read the Button state.
Does the DRBIII
t display either button pressed?
All
Yes
→
Replace the CMTC Push Button Module assembly in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→
2
Using the DRBIII
t in Compass/Mini Trip, Inputs/Outputs, read the Button state.
While observing the DRB press the STEP button, then the US/M button.
Does the DRBIII
t display PRESSED after pressing each button?
All
No
→
Replace the CMTC Push Button Module assembly in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Yes
→
Test Complete.
92
OVERHEAD CONSOLE
Symptom:
*CMTC DISPLAY SEGMENTS FAIL TO OPERATE
POSSIBLE CAUSES
CMTC SEGMENTS FAIL TO LIGHT UP
TEST
ACTION
APPLICABILITY
1
Perform the Compass/Mini Trip Auto Self Test. A Display Segment test will be run.
Did all the segments light?
All
Yes
→
Test Complete.
No
→
Replace the Compass Mini Trip Module.
Perform BODY VERIFICATION TEST - VER 1.
93
OVERHEAD CONSOLE
Symptom:
*CMTC DISPLAYS - CCD
POSSIBLE CAUSES
*CMTC DISPLAYS - CCD
TEST
ACTION
APPLICABILITY
1
Does the CMTC display - CCD?
All
Yes
→
Refer to symptom list for problems related to Communications.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Test Complete.
94
OVERHEAD CONSOLE
Symptom:
*CMTC DISPLAYS - SC
POSSIBLE CAUSES
CHECKING AMBIENT TEMPERATURE SENSOR
AMBIENT TEMPERATURE SENSOR SIGNAL SHORT TO GROUND
CMTC - AMBIENT TEMPERATURE INCORRECT (SHORTED)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Replace the Ambient Temperature Sensor harness connector
Note: Check connectors - Clean/repair as necessary.
Remove the Ambient Temperature Sensor.
Measure the resistance of the Ambient Temperature Sensor.
Using the resistance/degrees specifications compare the resistance reading of the
Ambient Temp Sensor, to the air temperature.
SENSOR SPECIFICATIONS: 32°F= 29.3 - 36 Ohms, 50°F= 18 - 22 Ohms, 68°F= 11.4
- 13.6 Ohms, 77°F= 9.1 - 10.8 Ohms, 86°= 7.4 - 8.7 Ohms, 104°= 4.9 - 5,7 Ohms, 122°=
3.3 - 3.8 Ohms
Is the resistance measurement with in the min/max readings, for the current
temperature?
All
Yes
→
No
→
Replace the Ambient Temperature Sensor in accordance with the
Service Information.
Note: After any repair for an ambient temperature sensor problem, the
vehicle must be driven over 3 miles above 25 mph continuouly in order to
update the CMTC display
2
Turn the ignition off.
Disconnect the Ambient Temperature Sensor.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the ambient temperature sensor signal circuit to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Ambient Temperature Sensor circuit for a short to
ground.
No
→
3
If there are no possible causes remaining, replace the CTMC.
If there are no possible causes remaining, view repair.
All
Repair
If there are no possible causes remaining, replace the CMTC.
95
OVERHEAD CONSOLE
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