Dodge Dakota (R1). Manual — part 51
TEST
ACTION
APPLICABILITY
2
CAUTION: The evaporator temperature must be above 18.3°C (65°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 the Powertrain Diagnostic Information.
After 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 repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
201
HEATING & A/C
COOLDOWN TEST EXCESSIVE FAULT —
Continued
Symptom:
COOLDOWN TEST SET UP FAULT
When Monitored and Set Condition:
COOLDOWN TEST SET UP FAULT
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. With the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→
2
Was the blower control switch set to high speed when 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, with the
DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Start the engine. Set the Blower switch to high speed. With the
DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
202
HEATING & A/C
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 18.3°C (65°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 18.3°C (65°F).
With the DRBIII
t, actuate the Cooldown Test.
Does the DRBIII
t display: Cooldown Test Too Cold To Start?
All
Yes
→
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. With the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→
203
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
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, check the PCM for any DTCs.
Are any DTCs present?
All
Yes
→
Refer to the Powertrain Diagnostic Information. After the repair
is complete, with the DRBIII
t, erase the DTC(s). Cycle the
ignition switch. With the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→
4
Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Turn the ignition on.
With the DRBIII
t in Sensor Display, read the Evaporator Temperature Sensor
voltage.
Is the voltage above 4.9 volts?
All
Yes
→
No
→
5
Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Connect a jumper wire between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit at the Evaporator Temperature Sensor harness
connector.
Turn the ignition on.
With the DRBIII
t in Sensor Display, read the Evaporator Temperature Sensor
voltage.
Is the voltage 0.0 volts?
All
Yes
→
Replace the Evaporator Temperature Sensor in accordance with
the Service Information. After repair is complete, rerun the
Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→
6
NOTE: Ensure that the voltmeter leads meet the terminals in the connector
and that there is good terminal to wire connection.
NOTE: Ensure the voltmeter leads are connected for positive polarity.
Back probe the Sensor Ground circuit between the Evaporator Temperature Sensor
harness connector and the A/C - Heater Control Module C1 harness connector.
Turn the ignition on.
Is the voltage below 0.10 volt?
All
Yes
→
No
→
Repair the high resistance in the Sensor Ground circuit. After
repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
204
HEATING & A/C
COOLDOWN TEST TOO COLD TO START —
Continued
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