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82–SENSOR TOO COLD TO START COOLDOWN TEST (MTC) (CONTINUED) For the Manual Temperature Control (MTC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING - SCHE- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes FAULTS PRESENT IN THE HVAC SYSTEM EVAPORATOR TEMPERATURE BELOW 18.3°C (65°F) AT START OF COOLDOWN TEST HIGH RESISTANCE ON (C121) SENSOR GROUND CIRCUIT HIGH RESISTANCE ON (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT EVAPORATOR TEMPERATURE SENSOR A/C HEATER CONTROL NOTE: This DTC will display as active if the ignition is not cycled after running the Cooldown Test. Other- Diagnostic Test 1. CHECK FOR ACTIVE DTC 31, 32, 83, OR 84 IN THE A/C HEATER CONTROL Turn the ignition on. Actuate the Display DTC function by performing the following: • Turn the blower control on. • Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and Does the A/C status indicator display DTC 31, 32, 83, or 84? Yes >> Diagnose and repair the DTC(s). Refer to the Table of Contents in this section for a complete list of HVAC related symptoms. Run the Cooldown Test again after the repair is complete. No >> Go To 2 2. ERASE DTCs IN THE A/C HEATER CONTROL Actuate the Clear DTC function by performing the following: • Turn the blower control on. • Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode • When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simulta- Turn the ignition off. >> Go To 3 24 - 196 HVAC - ELECTRICAL DIAGNOSTICS WK |