Diagnostic Procedure
INVALID CONDITIONS FOR COOLDOWN TEST, EVAP TEMPERATURE TOO LOW - ATC SYMPTOM CHART
| 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. Start the engine.Press the A/C mode switch off. The Snowflake should not be displayed on the ATC display panel.Set the blower speed to high. Allow the blower to run for 5 minutes to ensure that the Evaporator Temperature Sensor temperature is above 11.6°C (53°F).With the DRBIII®, actuate the AC Cooldown Test.Does the DRBIII® display the INVALID CONDITIONS FOR COOLDOWN TEST fault message?Yes --> Go To 2No --> Perform additional testing as necessary.Perform BODY VERIFICATION TEST - VER 1
. |
All |
| 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®, read the active ATC DTCs.Does the DRBIII® display any DTCs?Yes --> Return to the Heating & A/C symptom list and choose the symptom(s). After the repair is complete, with the DRBIII®, erase the DTC(s), then cycle the ignition switch, and then with the DRBIII®, actuate the AC Cooldown Test.Perform BODY VERIFICATION TEST - VER 1
.No --> Go To 3 |
All |
| 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®, read PCM DTCs.Does the DRBIII® display any DTCs?Yes --> Refer to the POWERTRAIN DIAGNOSTIC PROCEDURES
for the related symptom(s). After the repair is complete, with the DRBIII®, erase the DTC(s), then cycle the ignition switch, and then with the DRBIII®, actuate the AC Cooldown Test.Perform BODY VERIFICATION TEST - VER 1
.No --> Go To 4 |
All |
| 4 | Turn the ignition off. Disconnect the ATC C1 harness connector. Measure the resistance between the Evaporator Temperature Sensor Signal circuit and the Sensor Ground circuit. The approximate circuit resistance should be: 1,468 ohms @ 40°C (104°F). 1,800 ohms @ 35°C (95°F). 2,221 ohms @ 30°C (86°F). 2,757 ohms @ 25°C (77°F). 3,443 ohms @ 20°C (68°F). 4,330 ohms @ 15°C (59°F). 5,485 ohms @ 10°C (50°F). 7,354 ohms @ 4°C (39°F). 8,130 ohms @ 2°C (36°F). Is the resistance within the specifications? Yes --> Replace the Automatic Temperature Control (ATC) in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Ck the related ckts & connectors for conditions that would cause a high resistance in the ckts. Repair as necessary. If Ok, replace the Evap Temp Sensor in accordance with the Service Information. After repair is complete, run the AC Cooldown Test again. Perform BODY VERIFICATION TEST - VER 1 . |
All |