Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2301

•

When Monitored:
With the ignition on.

•

Set Condition:
If the Evaporator Temperature Sensor input is out of range toward the low voltage threshold.

Possible Causes

(C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

(C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO (C121) SENSOR GROUND
CIRCUIT

EVAPORATOR TEMPERATURE SENSOR

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.

CHECK FOR DTC B1031–EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW WITH
EVAPORATOR TEMPERATURE SENSOR HARNESS CONNECTOR DISCONNECTED

Turn the ignition off.

Disconnect the Evaporator Temperature Sensor harness connector.

Turn the ignition on.

With the scan tool, erase HVAC DTCs.

Turn the ignition off, wait 10 seconds, and turn the ignition on.

With the scan tool, read HVAC DTCs.

Does the scan tool display: B1031–EVAPORATOR FIN TEMPER-
ATURE SENSOR CIRCUIT LOW?

Yes

>> Go To 2

No

>> 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).

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HVAC - ELECTRICAL DIAGNOSTICS

LX

2.

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

Turn the ignition off.

Disconnect the A/C Heater Control C2 harness connector.

Measure the resistance of the (C21) Evaporator Temperature Sensor
Signal circuit between ground and the A/C Heater Control C2 harness
connector.

Is the resistance below 10k ohms?

Yes

>> Repair the (C21) Evaporator Temperature Sensor Signal

circuit for a short to ground.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-

ELECTRICAL/ELECTRONIC

CONTROL

MODULES/

FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).

No

>> Go To 3

3.

CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO (C121)
SENSOR GROUND CIRCUIT

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.

Is the resistance below 10k ohms?

Yes

>> Repair the (C21) Evaporator Temperature Sensor Signal

circuit for a short to the (C121) Sensor Ground circuit.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-

ELECTRICAL/ELECTRONIC

CONTROL

MODULES/

FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).

No

>> Replace the A/C Heater Control in accordance with the Ser-

vice Information.

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 - 239

B1032–EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT HIGH (ATC)

For a complete wiring diagram Refer to Section 8W.

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HVAC - ELECTRICAL DIAGNOSTICS

LX

•

When Monitored:
With the ignition on.

•

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

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

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.

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

Turn the ignition off.

Disconnect the A/C Heater Control C2 harness connector.

Turn the ignition on.

Measure the voltage of the (C21) Evaporator Temperature Sensor Sig-
nal circuit.

Is the voltage above 0.2 volts?

Yes

>> Repair the (C21) Evaporator Temperature Sensor Signal

circuit for a short to voltage.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-

ELECTRICAL/ELECTRONIC

CONTROL

MODULES/

FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).

No

>> Go To 2

LX

HVAC - ELECTRICAL DIAGNOSTICS

24 - 241