Manual Temperature Control

B1032 - Evaporator Fin Temperature Sensor Circuit High

For a complete wiring diagram, refer to.






• When Monitored: With the ignition on.

• Set Condition: If the evaporator temperature sensor input is out of range toward the high voltage threshold.






• This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored.

Test Step 1 - Check Evaporator Temperature Sensor Signal Circuit for a Short to Voltage






• Turn the ignition OFF.

• Disconnect the A/C heater control C2 (3 ZONE MTC) 16 way harness connector.

• Turn the ignition ON.

• Measure the voltage of the evaporator temperature sensor signal circuit in the A/C heater control C2 (3 ZONE MTC) 16 way harness connector.

Is the voltage more than 0.2 volts?

Yes

• Repair the evaporator temperature sensor signal circuit for a short to voltage.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Go to Test Step 2 => [ Test Step 2 - Check Evaporator Temperature Sensor Signal Circuit,
Sensor Ground Circuit, and Evaporator Temperature Sensor ]

Test Step 2 - Check Evaporator Temperature Sensor Signal Circuit, Sensor Ground Circuit, and Evaporator Temperature Sensor






• Turn the ignition OFF.

• Measure the resistance between the evaporator temperature sensor signal circuit and the sensor ground circuit in the A/C heater control C2 (3 ZONE MTC) 16 way harness connector. The approximate circuit resistance should be as follows:

• 1468 ohms @ 40 °C (104 °F)

• 1800 ohms @ 35 °C (95 °F)

• 2221 ohms @ 30 °C (86 °F)

• 2757 ohms @ 25 °C (77 °F)

• 3443 ohms @ 20 °C (68 °F)

• 4330 ohms @ 15 °C (59 °F)

• 5485 ohms @ 10 °C (50 °F)

• 6998 ohms @ 5 °C (41 °F)

• 7354 ohms @ 4 °C (39 °F)

• 7731 ohms @ 3 °C (37 °F)

• 8130 ohms @ 2 °C (36 °F)

• 8553 ohms @ 1 °C (34 °F)

• 9000 ohms @ 0 °C (32 °F)

Is the resistance within the specifications?

Yes

• Replace the A/C heater control.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Go to Test Step 3 => [ Test Step 3 - Check Evaporator Temperature Sensor Signal Circuit
for an Open ]

Test Step 3 - Check Evaporator Temperature Sensor Signal Circuit for an Open






• Disconnect the evaporator temperature sensor harness connector.

• Measure the resistance of the evaporator temperature sensor signal circuit between the A/C heater control C2 (3 ZONE MTC) 16 way harness connector and the evaporator temperature sensor harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Go to Test Step 4 => [ Test Step 4 - Check Sensor Ground Circuit for an Open ]

No

• Repair the evaporator temperature sensor signal circuit for an open.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 4 - Check Sensor Ground Circuit for an Open






• Measure the resistance of the sensor ground circuit between the A/C heater control C2 (3 ZONE MTC) 16 way harness connector and the evaporator temperature sensor harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Replace the evaporator temperature sensor.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Repair the sensor ground circuit for an open.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test