B1031–EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW (CCN)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
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(C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
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EVAPORATOR TEMPERATURE SENSOR
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INSTRUMENT CLUSTER (CCN)
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Diagnostic Test
1.
VERIFY B1031–EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW IS ACTIVE
Turn the ignition on.
With the scan tool, erase DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display this DTC as active?
Yes
No
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Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related
connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
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Perform the BODY VERIFICATION TEST – VER 1.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2.
CHECK FOR DTC WITH THE EVAPORATOR TEMPERATURE SENSOR HARNESS CONNECTOR DISCONNECTED
Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Turn the ignition on.
With the scan tool, erase DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display this DTC as active?
Yes
No
3.
CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Instrument Cluster (CCN) C3 harness connector.
Measure the resistance between ground and the (C21) Evaporator Temperature Sensor Signal circuit and ground.
Does the ohm meter read open circuit?
Yes
No
-
Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to ground.