Jeep XJ. Manual — part 554
Symptom:
*CMTC DISPLAYS- OC
POSSIBLE CAUSES
AMBIENT TEMP SENSOR GROUND CIRCUIT OPEN
AMBIENT TEMPERATURE SIGNAL CIRCUIT OPEN
CHECKING AMBIENT TEMPERATURE SENSOR
AMBIENT TEMP SENSOR GROUND CIRCUIT OPEN
AMBIENT TEMPERATURE SIGNAL CIRCUIT OPEN
CMTC - AMBIENT TEMPERATURE INCORRECT
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect 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.
Perform BODY VERIFICATION TEST - VER 1.
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, wait 1 minute.
Disconnect the ambient temperature sensor harness connector.
Measure the resistance between ground and the Ambient Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open in the ambient temperature ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
96
OVERHEAD CONSOLE
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the CMTC harness connector.
Disconnect the ambient temperature sensor.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the ambient temp signal circuit from the CMTC harness
connector to the ambient temp harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ambient Temperature Signal circuit for an open
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the CMTC harness connector.
Disconnect the ambient temperature sensor.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the ambient temp signal circuit from the CMTC harness
connector to the ambient temp harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ambient Temperature Signal circuit for an open
Perform BODY VERIFICATION TEST - VER 1.
5
Turn the ignition off, wait 1 minute.
Disconnect the ambient temperature sensor harness connector.
Measure the resistance between ground and the Ambient Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open in the Ambient Temperature Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
6
If there are no possible causes remaining, view repair.
All
Repair
Replace the CMTC.
Perform BODY VERIFICATION TEST - VER 1.
97
OVERHEAD CONSOLE
*CMTC DISPLAYS- OC —
Continued
Symptom:
*CMTC INCORRECT ELAPSED TIME
POSSIBLE CAUSES
CMTC INTERNAL FAULT
TEST
ACTION
APPLICABILITY
1
Verify that the symptom still exists.
Is the symptom present now?
All
Yes
→
If there are no possible causes remaining, replace the CMTC.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Test Complete.
98
OVERHEAD CONSOLE
Symptom:
*CMTC INCORRECT TEMP READING
POSSIBLE CAUSES
CHECKING AMBIENT TEMPERATURE SENSOR
AMBIENT TEMP SENSOR GROUND CIRCUIT OPEN
AMBIENT TEMPERATURE SIGNAL CIRCUIT OPEN
CMTC - AMBIENT TEMPERATURE INCORRECT (OC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect 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.
Perform BODY VERIFICATION TEST - VER 1.
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, wait 1 minute.
Disconnect the ambient temperature sensor harness connector.
Measure the resistance between ground and the Ambient Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open in the Ambient Temperature Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the CMTC harness connector.
Disconnect the ambient temperature sensor.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the ambient temp signal circuit from the CMTC harness
connector to the ambient temp harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ambient Temperature Signal circuit for an open
Perform BODY VERIFICATION TEST - VER 1.
99
OVERHEAD CONSOLE
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст