Dodge Ram. Manual — part 96
Symptom:
BLOWER NOT ON HIGH
When Monitored and Set Condition:
BLOWER NOT ON HIGH
When Monitored:
When executing the Cooldown Test.
Set Condition:
This message will be displayed if the blower is not operating at high speed
while the Cooldown Test is running.
POSSIBLE CAUSES
CHECK FOR HVAC DTCS
TEST SET UP CONDITIONS NOT MET
BLOWER/RELATED CIRCUITS
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read HVAC DTCs.
Does the DRBIII
t display any HVAC DTCs?
All
Yes
→ Return to the symptom list and choose the symptom(s). After the
repair is complete, with the DRBIII
t, erase the DTC(s). Cycle the
ignition switch. Start the engine. Set the blower control to high
speed. With the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Was the blower control set to high speed the entire time the Cooldown Test was
actuated?
All
Yes
→ Check the blower motor and related circuits for blower operation
problems. Repair as necessary. After repair is complete, start the
engine. Set the blower control to high speed. With the DRBIII
t,
actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Start the engine. Set the blower control to high speed. With the
DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
381
HEATING & A/C
Symptom List:
COOLDOWN TEST SENSOR FAILURE
COOLDOWN TIME EXCESSIVE FAULT
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be COOLDOWN TEST SENSOR
FAILURE.
When Monitored and Set Condition:
COOLDOWN TEST SENSOR FAILURE
When Monitored:
When executing the Cooldown Test.
Set Condition:
This message will be displayed if a fault is detected with the Evaporator
Temperature Sensor/circuit when executing the Cooldown Test.
COOLDOWN TIME EXCESSIVE FAULT
When Monitored:
When executing the 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 one minute.
POSSIBLE CAUSES
CHECK FOR HVAC DTCS
CHECK FOR PCM DTCS
A/C SYSTEM TESTING
TEST
ACTION
APPLICABILITY
1
CAUTION: The evaporator temperature must be above 12.7°C (55°F) to test
A/C system operation.
Turn the ignition on.
With the DRBIII
t, read HVAC DTCs.
Does the DRBIII
t display any HVAC DTCs?
All
Yes
→ Return to the symptom list and choose the symptom(s). After the
repair is complete, with the DRBIII
t, erase the DTC(s). Cycle the
ignition switch. Start the engine. Set the blower control to high
speed. With the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
382
HEATING & A/C
TEST
ACTION
APPLICABILITY
2
CAUTION: The evaporator temperature must be above 12.7°C (55°F) to test
A/C system operation.
Turn the ignition on.
With the DRBIII
t, check the PCM for any DTCs.
Are any DTCs present?
All
Yes
→ Refer to Powertrain Diagnostic Information. After the repair is
complete, with the DRBIII
t, erase the DTC(s). Cycle the ignition
switch. Start the engine. Set the blower control to high speed.
With the DRBIII
t, actuate 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.
Perform BODY VERIFICATION TEST - VER 1.
383
HEATING & A/C
COOLDOWN TEST SENSOR FAILURE —
Continued
Symptom:
COOLDOWN TEST TOO COLD TO START
When Monitored and Set Condition:
COOLDOWN TEST TOO COLD TO START
When Monitored:
When executing the Cooldown Test.
Set Condition:
This message will be displayed if the A/C - Heater Control Module sees
evaporator temperature below 12.7°C (55°F) when executing the Cooldown Test.
POSSIBLE CAUSES
EVAPORATOR TEMPERATURE TOO LOW
CHECK FOR HVAC DTCS
CHECK FOR PCM DTCS
EVAPORATOR TEMPERATURE SENSOR
SENSOR GROUND CIRCUIT HIGH RESISTANCE
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT HIGH RESISTANCE
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
CAUTION: The work area ambient temperature must be above 21.1°C (70°F)
to test A/C system operation.
Start the engine.
Turn the A/C off.
Turn the blower on high. Allow the blower to run for 5 minutes to ensure that the
Evaporator Temperature Sensor temperature is above 12.7°C (55°F).
With the DRBIII
t, actuate the Cooldown Test.
Does the DRBIII
t display: Cooldown Test Too Cold To Start?
All
Yes
→ Go To 2
No
→ Perform additional testing as necessary.
Perform BODY VERIFICATION TEST - VER 1.
2
CAUTION: 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 HVAC DTCs.
Does the DRBIII
t display any HVAC DTCs?
All
Yes
→ Return to the symptom list and choose the symptom(s). After the
repair is complete, with the DRBIII
t, erase the DTC(s). Cycle the
ignition switch. Start the engine. Set the blower control to high
speed. With the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
384
HEATING & A/C
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