Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2279
83–SENSOR FAILED OPEN DURING COOLDOWN TEST (MTC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
When executing the Cooldown Test.
•
Set Condition:
If the Evaporator Temperature Sensor input is out of range toward the high voltage threshold when executing
the Cooldown Test.
NOTE: This DTC will display as active if the ignition is not cycled after running the Cooldown Test. Other-
wise, it will display as stored until cleared.
Refer to 31–EVAPORATOR SENSOR OPEN for the diagnostic test procedure.
84–SENSOR FAILED SHORTED DURING COOLDOWN TEST (MTC)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
When executing the Cooldown Test.
•
Set Condition:
If the Evaporator Temperature Sensor input is out of range toward the low voltage threshold when executing
the Cooldown Test.
NOTE: This DTC will display as active if the ignition is not cycled after running the Cooldown Test. Other-
wise, it will display as stored until cleared.
Refer to 32–EVAPORATOR SENSOR SHORTED for the diagnostic test procedure.
24 - 150
HVAC - ELECTRICAL DIAGNOSTICS
LX
85–BLOWER NOT ON HIGH DURING COOLDOWN TEST (MTC)
For a complete wiring diagram Refer to Section 8W.
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 151
•
When Monitored:
When executing the Cooldown Test.
•
Set Condition:
If the A/C Heater Control sensed that the blower was not operating at high speed while the Cooldown Test was
running.
Possible Causes
BLOWER CONTROL DID NOT REMAIN ON THE HIGH SPEED SETTING DURING THE ENTIRE COOLDOWN
TEST
BLOWER MOTOR / RELATED CIRCUITS
(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 HEATER CONTROL
NOTE: This DTC will display as active if the ignition is not cycled after running the Cooldown Test. Other-
wise, it will display as stored until cleared.
Diagnostic Test
1.
CHECK THE BLOWER SPEED SETTING
Was the blower control set to high speed for the entire Cooldown Test?
Yes
>> Go To 2
No
>> Start the engine, set the blower control to high speed, and then run the Cooldown Test again.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
2.
CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z908)
GROUND CIRCUIT
Turn the ignition off.
Disconnect the A/C Heater Control C3 harness connector.
Measure the resistance between the (C850) Blower Switch Position Sig-
nal circuit and the (Z908) Ground circuit in the A/C Heater Control C3
harness connector.
Is the resistance below 10K ohms?
Yes
>> Repair the (C850) Blower Switch Position Signal circuit for a
short to the (Z908) Ground circuit. Run the Cooldown Test
again after the repair is complete.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 3
24 - 152
HVAC - ELECTRICAL DIAGNOSTICS
LX
3.
CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (Z909)
GROUND CIRCUIT
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the (C850) Blower Switch Position Sig-
nal circuit and the (Z909) Ground circuit in the A/C Heater Control C1
harness connector.
Is the resistance below 10K ohms?
Yes
>> Repair the (C850) Blower Switch Position Signal circuit for a
short to the (Z909) Ground circuit. Run the Cooldown Test
again after the repair is complete.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 4
4.
CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT VOLTAGE
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C850) Blower Switch Position Signal circuit.
Is the voltage above 4.8 volts?
Yes
>> Check the blower motor and related circuits for the cause of
blower operation problems and repair as necessary. Run
the Cooldown Test again after the repair is complete.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 5
5.
CHECK THE (C850) BLOWER SWITCH POSITION SIGNAL CIRCUIT FOR A SHORT TO GROUND
Measure the resistance of the (C850) Blower Switch Position Signal cir-
cuit between ground and the A/C Heater Control C3 harness connector.
Is the resistance below 10K ohms?
Yes
>> Repair the (C850) Blower Switch Position Signal circuit for a
short to ground. Run the Cooldown Test again after the
repair is complete.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 6
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 153
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст