MTC 32

32-EVAPORATOR SENSOR SHORTED (MTC)

32-Evaporator Sensor Shorted (MTC):

WHEN MONITORED
Following the Start Up Wait Time after ignition on.

SET CONDITION
If the Evaporator Temperature Sensor input is out of range toward the low voltage threshold.

POSSIBLE CAUSES
- (C21) evaporator temperature sensor signal circuit shorted to ground
- (C21) evaporator temperature sensor signal circuit shorted to (C121) sensor ground Circuit
- Evaporator temperature sensor
- A/C heater control

NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (MTC) for stored DTC test procedures. HVAC System Test (MTC)

DIAGNOSTIC TEST

1. CHECK FOR DTC 32-EVAPORATOR SENSOR SHORTED WITH EVAPORATOR TEMPERATURE SENSOR HARNESS CONNECTOR DISCONNECTED




Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Actuate the Clear DTC function by performing the following:
- Turn the ignition on.
- Turn the blower control on.
- Press the A/C mode switch down, turn the blower control to off, wait 3 seconds and then release the A/C mode switch.
- When the A/C status indicator begins flashing DTCs, press the A/C mode switch down for 3 seconds and then release the switch.

Turn the ignition off, wait 10 seconds, and 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 3 seconds and then release the A/C mode switch.

NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.

Read DTCs from the flashing A/C status indictor.

Q: Does the A/C status indicator flash DTC 32?

YES: Go To 2
NO: Replace the Evaporator Temperature Sensor. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2. CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Measure the resistance of the (C21) Evaporator Temperature Sensor Signal circuit between ground and the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO (C121) SENSOR GROUND CIRCUIT




Measure the resistance between the (C21) Evaporator Temperature Sensor Signal circuit and the (C121) Sensor Ground circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to the (C121) Sensor Ground circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test