Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2248
•
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 (MTC) for stored DTC test procedures.
Diagnostic Test
1.
CHECK FOR DTC 32–EVAPORATOR SENSOR SHORTED WITH EVAPORATOR TEMPERATURE SENSOR
HARNESS CONNECTOR DISCONNECTED
Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Turn the ignition on.
Actuate the Clear DTC function by performing the following:
•
Turn the blower control on.
•
Press the A/C mode switch down, turn the blower control to off,
wait until both LEDs illuminate (approximately 5 seconds) and
then release the A/C mode switch.
•
When the A/C status indicator begins displaying DTCs, set the
Mode switch to the floor position, simultaneously press the A/C
mode switch and the EBL mode switch down until both LEDs start
flashing (approximately 5 seconds) and then release the mode
switches. Stored DTCs will clear from memory in approximately
two seconds.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
Actuate the Display DTC function by performing the following:
•
Turn the blower control on.
•
Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately
5 seconds) and then release the A/C mode switch.
NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and
stored DTCs when the EBL status indicator is illuminated.
Read DTCs from the A/C status indictor.
Does the A/C status indicator display DTC 32?
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 TESTING).
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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
TESTING).
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 27
33–A/C MODE SWITCH STUCK (MTC)
For a complete wiring diagram Refer to Section 8W.
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HVAC - ELECTRICAL DIAGNOSTICS
LX
Theory of Operation
The A/C mode switch input changes when the switch is pushed down. A stored DTC 33 indicates that the A/C mode
switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state. An
active DTC 33 indicates that the A/C mode switch is stuck in a pushed position. An active DTC 33 will prevent the
control from entering diagnostic mode and performing certain diagnostic functions. It will also prevent proper A/C
mode switch and status indicator function. For additional information about the A/C Heater Control’s on-board diag-
nostics, refer to 24 - HEATING & AIR CONDITIONING - DIAGNOSIS AND TESTING.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C mode switch stays in a pushed position for more than 10 minutes.
Possible Causes
OBJECT HOLDING A/C MODE SWITCH IN A PUSHED POSITION
SUBSTANCE CAUSING A/C MODE SWITCH TO GET STUCK IN A PUSHED POSITION
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO VOLTAGE
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (Z908) GROUND CIRCUIT
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (Z909) GROUND CIRCUIT
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO GROUND
(C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT OPEN
A/C STATUS INDICATOR INOPERATIVE
A/C HEATER CONTROL
Diagnostic Test
1.
INSPECT THE A/C HEATER CONTROL FOR DAMAGE
Turn the ignition off.
Inspect the A/C Heater Control for damage.
Is the A/C Heater Control damaged?
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 2
2.
INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH TO STAY OR STICK IN A
PUSHED POSITION
Inspect the A/C Heater Control for anything that would cause the A/C mode switch to stay or stick in a pushed
position.
Is anything present that would cause the A/C mode switch to stay or stick in a pushed position?
Yes
>> Repair as necessary.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 3
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 29
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