Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2302
2.
CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT, (C121) SENSOR GROUND
CIRCUIT, & EVAPORATOR TEMPERATURE SENSOR
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 C2 harness connector. The approximate circuit resis-
tance 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
>> Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 3
3.
CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN
Disconnect the Evaporator Temperature Sensor harness connector.
Measure the resistance of the (C21) Evaporator Temperature Sensor
Signal circuit between the A/C Heater Control C2 harness connector
and the Evaporator Temperature Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the (C21) Evaporator Temperature Sensor Signal
circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
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HVAC - ELECTRICAL DIAGNOSTICS
LX
4.
CHECK (C121) SENSOR GROUND CIRCUIT FOR AN OPEN
Measure the resistance of the (C121) Sensor Ground circuit between
the A/C Heater Control C2 harness connector and the Evaporator Tem-
perature Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Evaporator Temperature Sensor in accordance
with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Repair the (C121) Sensor Ground circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 243
B1034–INFRARED TEMPERATURE SENSOR INPUT CIRCUIT LOW (ATC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the IR Sensor fails the internal self test.
Possible Causes
A/C HEATER CONTROL
NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC
is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures.
Diagnostic Test
1.
REPLACE THE A/C HEATER CONTROL
Repair
Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
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HVAC - ELECTRICAL DIAGNOSTICS
LX
B1035–INFRARED TEMPERATURE SENSOR INPUT CIRCUIT HIGH (ATC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the IR Sensor fails the internal self test.
Possible Causes
A/C HEATER CONTROL
NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC
is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures.
Diagnostic Test
1.
REPLACE THE A/C HEATER CONTROL
Repair
Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 245
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