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81–BLOWER NOT ON HIGH AT START OF 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 BLOWER CONTROL NOT SET TO HIGH SPEED WHEN EXECUTING THE COOLDOWN TEST BLOWER MOTOR / RELATED CIRCUITS (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (C121) SENSOR GROUND CIRCUIT (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO GROUND (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT OPEN 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 THE BLOWER SPEED SETTING Was the blower control set to high speed before executing the Cooldown Test? Yes >> Go To 2 No >> Start the engine, set the blower control to high speed, and then run the Cooldown Test again. Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL 2. CHECK THE (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (C121) Turn the ignition off. Disconnect the A/C Heater Control C2 harness connector. Measure the resistance between the (C41) Blower Switch Position Sig- Is the resistance below 10K ohms? Yes >> Repair the (C41) Blower Switch Position Signal circuit for a short to the (C121) Sensor Ground circuit. Run the Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 No >> Go To 3 24 - 192 HVAC - ELECTRICAL DIAGNOSTICS WK |