DTC 5 - Evaporator Fin Sensor "Open"

DIAGNOSTIC TROUBLE CODE 5 - EVAPORATOR FIN SENSOR "OPEN"
When the Control Module performs diagnostics on the Evaporator Fin Sensor, the module tests the circuit for open and short circuit conditions. When an open circuit condition is found, DTC 5 sets. When the condition is not corrected, the compressor may not cycle long enough to maintain passenger comfort. This condition should not be mistaken for an A/C system low on refrigerant charge.

When a DTC 5 is detected, it is stored in the Control Module memory. After the DTC is found and corrected, it is necessary to erase the DTC before the test can run successfully. To erase the DTC, use the DRB III. Run the Calibration test once more to ensure the condition is corrected.

Detection
When the voltage at C21 is greater than 4.75 volts, the DRB III� will display the DTC (may take up to 15 minutes to set).

Possible Causes
When DTC 5 is detected, the only possible caused are an OPEN circuit or a SHORT to voltage in the Evaporator

Test Procedures
1. Using a voltmeter, check Pin 1 of the evaporator probe wiring connector for 0.1 - 4.75 volts. If OK, go to Step 2. If not OK, if greater than 4.75 volts check for loose or corroded connector, open circuit and repair as necessary.
2. Using a ohmmeter, check Pin 2 for a good ground, If OK, go to Step 3. If not OK, check for loose or corroded connector, open or shorted circuit and repair as necessary.
3. If ground and power circuit are OK, replace Evaporator Probe.
4. Once repairs are completed, press the intermittent button about 5 seconds until all LED's light to remove fault code from memory. Then repeat the Calibration Diagnostic and Cooldown test. Repeating the test is necessary to clear the fault codes.