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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: EVAP TEMP SENSOR OPEN (ACTIVE) - ATC >> Diagnostic Procedure

Diagnostic Procedure

EVAP TEMP SENSOR OPEN (ACTIVE) SYMPTOM CHART

TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Turn the ignition on.
Measure the voltage of the Evaporator Temperature Sensor Signal circuit.
Is the voltage above 0.2 volts?
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 ATC C1 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit and the Front Blower Motor Control circuit.
Is the resistance below 10K ohms?
Yes --> Repair the Evaporator Temperature Sensor Signal circuit for a short to the Front Blower Motor Control circuit.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Go To 3		 All
3 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit and the Rear Booster Fan Control circuit.
Is the resistance below 10K ohms?
Yes --> Repair the Evaporator Temperature Sensor Signal circuit for a short to the Rear Booster Fan Control circuit.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Go To 4		 All
4 Turn the ignition off.
Disconnect the ATC 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 Automatic Temperature Control (ATC) in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Go To 5		 All
5 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Evaporator Temperature Sensor Signal circuit between the ATC C1 harness connector and the in-line C202 harness connector (IP Side).
Is the resistance below 5.0 ohms?
Yes --> Go To 6
No --> Repair the Evaporator Temperature Sensor Signal circuit between the ATC C1 harness connector and the in-line C202 harness connector (IP side) for an open.
Perform BODY VERIFICATION TEST - VER 1 .		 All
6 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Sensor Ground circuit between the ATC C1 harness connector and the in-line C202 harness connector (IP side).
Is the resistance below 5.0 ohms?
Yes --> Check the wiring harness between the in-line C202 harness connector (HVAC side) and the Evap Temp Sensor for an open. Repair as necessary. If Ok, replace the Evaporator Temperature Sensor.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Repair the Sensor Ground circuit between the ATC C1 harness connector and the in-line C202 harness connector (IP side) for an open.
Perform BODY VERIFICATION TEST - VER 1 .		 All
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