Chrysler Pacifica. Manual — part 142
Symptom List:
COOLDOWN TEST FAILED - ATC
COOLDOWN TIME EXCESSIVE FAULT - ATC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be COOLDOWN TEST FAILED -
ATC.
When Monitored and Set Condition:
COOLDOWN TEST FAILED - ATC
When Monitored:
When executing the Cooldown Test.
Set Condition:
This message will display if the A/C system is unable to bring the
evaporator temperature down either 6.7°C (20°F) within two minutes at ambient temper-
atures of 21°C (70°F) or above, or bring the evaporator temperature down 9.4°C (15°F)
within two minutes at ambient temperatures below 21°C (70°F).
COOLDOWN TIME EXCESSIVE FAULT - ATC
When Monitored:
When executing the Cooldown Test.
Set Condition:
This message will display if the A/C system is unable to bring the
evaporator temperature down either 6.7°C (20°F) within two minutes at ambient temper-
atures of 21°C (70°F) or above, or bring the evaporator temperature down 9.4°C (15°F)
within two minutes at ambient temperatures below 21°C (70°F).
POSSIBLE CAUSES
OTHER COOLDOWN TEST FAULT MESSAGES PRESENT
AUTOMATIC TEMPERATURE CONTROL (ATC) DTC(S) PRESENT
POWERTRAIN CONTROL MODULE (PCM) DTC(S) PRESENT
ADDITIONAL A/C SYSTEM TESTING REQUIRED
TEST
ACTION
APPLICABILITY
1
CAUTION: The work area ambient temperature must be above 15.6°C (60°F)
and the evaporator temperature must be above 12°C (53°F) in order to test
A/C system operation.
Are other Cooldown Test fault messages displayed?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom(s).
After the repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
565
HEATING & A/C
TEST
ACTION
APPLICABILITY
2
CAUTION: The work area ambient temperature must be above 15.6°C (60°F)
and the evaporator temperature must be above 12°C (53°F) in order to test
A/C system operation.
Turn the ignition on.
With the DRBIII
t, read the active ATC DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom(s).
After the repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
CAUTION: The work area ambient temperature must be above 15.6°C (60°F)
and the evaporator temperature must be above 12°C (53°F) in order to test
A/C system operation.
Turn the ignition on.
With the DRBIII
t, read PCM DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to the Powertrain Diagnostic Information for the related
symptom(s).
After the repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Refer to the Service Information for additional Cooldown Test
related diagnostic information and testing procedures.
After the repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
566
HEATING & A/C
COOLDOWN TEST FAILED - ATC —
Continued
Symptom List:
COOLDOWN TEST SENSOR FAILURE - MTC
COOLDOWN TIME EXCESSIVE FAULT - MTC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be COOLDOWN TEST SENSOR
FAILURE - MTC.
When Monitored and Set Condition:
COOLDOWN TEST SENSOR FAILURE - MTC
When Monitored:
When executing the AC Cooldown Test.
Set Condition:
This message will be displayed if a fault is detected with the Evaporator
Temperature Sensor/circuit when executing the AC Cooldown Test.
COOLDOWN TIME EXCESSIVE FAULT - MTC
When Monitored:
When executing the AC Cooldown Test.
Set Condition:
This message will be displayed if the A/C system is unable to bring the
evaporator temperature down 6.7°C (20°F) within two minutes.
POSSIBLE CAUSES
ACTIVE HVAC DTC(S) PRESENT
POWERTRAIN CONTROL MODULE (PCM) DTC(S) PRESENT
ADDITIONAL A/C SYSTEM TESTING REQUIRED
TEST
ACTION
APPLICABILITY
1
CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
Turn the ignition on.
With the DRBIII
t, read active HVAC DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom(s).
After repair is complete, run the Cooldown Test again.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
567
HEATING & A/C
TEST
ACTION
APPLICABILITY
2
CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
Turn the ignition on.
With the DRBIII
t, read Powertrain Control Module (PCM) DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to Powertrain Diagnostic information for the related symp-
tom(s).
After repair is complete, run the Cooldown Test again.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Refer to the Service Information for additional Cooldown Test
related diagnostic information and testing procedures.
After repair is complete, run the Cooldown Test again.
Perform BODY VERIFICATION TEST - VER 1.
568
HEATING & A/C
COOLDOWN TEST SENSOR FAILURE - MTC —
Continued
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