Dodge Nitro. Manual - part 697

With the ignition on. 

Set Condition: 

If the Evaporator Temperature Sensor input is out of range toward the high voltage threshold. 

Diagnostic Test 

1) ACTIVE DTC(S) PRESENT 

Turn the ignition on. 

Using the A/C Heater Control, turn the heater on. 

With the scan tool, check for DTCs. 

Does the scan tool display this DTC as active?  

Yes  

Go to 2).  

No  

The condition that caused this symptom is currently not present. 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.  

Perform BODY VERIFICATION TEST - VER 1 .  

2) CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A 
SHORT TO VOLTAGE 

Possible Causes 

(C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
(C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
(C121) SENSOR GROUND CIRCUIT OPEN
EVAPORATOR TEMPERATURE SENSOR
A/C HEATER CONTROL

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Fig. 4: Measuring Voltage Of (C21) Evaporator Temperature Sensor Signal Circuit In A/C Heater 
Control C1 Harness Connector 
Courtesy of CHRYSLER LLC 

Turn the ignition off. 

Disconnect the A/C Heater Control C1 harness connector. 

Turn the ignition on. 

Measure the voltage of the (C21) Evaporator Temperature Sensor Signal circuit in the A/C Heater 
Control C1 harness connector. 

Is there any voltage present?  

Yes  

Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to voltage.  

Perform BODY VERIFICATION TEST - VER 1 .  

No  

Go to 3).  

3) CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT, (C121) 
SENSOR GROUND CIRCUIT, & EVAPORATOR TEMPERATURE SENSOR 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Fig. 5: Measuring Resistance Between (C21) Evaporator Temperature Sensor Signal Circuit And 
(C121) Sensor Ground Circuit In A/C Heater Control C1 Harness Connector 
Courtesy of CHRYSLER LLC 

Turn the ignition off. 

Measure the resistance between the (C21) Evaporator Temperature Sensor Signal circuit and the (C121) 
Sensor Ground circuit in the A/C Heater Control C1 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  

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Replace the A/C Heater Control in accordance with the service information.  

Perform BODY VERIFICATION TEST - VER 1 .  

No  

Go to 4).  

4) CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN 
OPEN 

Fig. 6: Measuring Resistance Of (C21) Evaporator Temperature Sensor Signal Circuit Between 
A/C Heater Control C1 Harness Connector And Evaporator Temperature Sensor Harness 
Connector 
Courtesy of CHRYSLER LLC 

Disconnect the Evaporator Temperature Sensor harness connector. 

Measure the resistance of the (C21) Evaporator Temperature Sensor Signal circuit between the A/C 
Heater Control C1 harness connector and the Evaporator Temperature Sensor harness connector.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro