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Home >> Chrysler >> 2005 >> Pacifica Limited >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Body Diagnostic Procedures - Diagnostic Information And Procedures - HVAC, Ignition Power Accessory, Instrument Cluster, Interior Lighting, Navigation, Overhead Console >> Heating & A/C >> Symptom: EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE) - MTC >> Diagnostic Procedure

Diagnostic Procedure

EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE) SYMPTOM CHART

TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the Evaporator Temperature Sensor Signal circuit.
Is there any voltage present?
Yes --> Repair the Evaporator Temperature Sensor Signal circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Go To 2		 All
2 Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit and the Sensor Ground circuit. The approximate circuit resistance should be:
1,468 ohms @ 40°C (104°F).
1,800 ohms @ 35°C (95°F).
2,221 ohms @ 30°C (86°F).
2,757 ohms @ 25°C (77°F).
3,443 ohms @ 20°C (68°F).
4,330 ohms @ 15°C (59°F).
5,485 ohms @ 10°C (50°F).
7,354 ohms @ 4°C (39°F).
8,130 ohms @ 2°C (36°F).
Is the resistance within the specifications?
Yes --> Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Go To 3		 All
3 Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Evaporator Temperature Sensor Signal circuit between the A/C Heater Control C1 harness connector and the in-line C202 harness connector.
Is the resistance below 5.0 ohms?
Yes --> Go To 4
No --> Repair the Evaporator Temperature Sensor Signal circuit between the A/C Heater Control C1 harness connector and the in-line C202 harness connector (HVAC side) for an open.
Perform BODY VERIFICATION TEST - VER 1 .		 All
4 Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Sensor Ground circuit between the A/C Heater Control C1 harness connector and the in-line C202 harness connector.
Is the resistance below 5.0 ohms?
Yes --> Check the wiring harness between the in-line C202 harness connector (plenum side) and the Evaporator Temperature Sensor for an open. Repair as necessary. If Ok, replace the Evaporator Temperature Sensor in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Repair the Sensor Ground circuit between the A/C Heater Control C1 harness connector and the in-line C202 harness connector (HVAC side) for an open.
Perform BODY VERIFICATION TEST - VER 1 .		 All
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