DTC P0483 [MZ-CD 1.6 (Y6) (EURO4 emission level)]


id0102g6832100

DTC P0483

Cooling fan control circuit performance problem

DETECTION CONDITION
•  The PCM monitors the cooling fan control signal circuit at PCM terminal 318. If the PCM detects any of the following conditions in the cooling fan control signal circuit, the PCM determines that there is a malfunction in the cooling fan control circuit.
―  Open circuit is detected for 2 s
―  Temperature of power stage module in PCM is detected as excessively high for 1 s
POSSIBLE CAUSE
•  Fan control module connector or terminal malfunction
•  Open circuit in wiring harness between following fan control module terminal and ground
―  Terminal 1A
―  Terminal 2A
•  Open circuit in wiring harness between battery positive post and fan control module terminal 1D
•  Short to ground in wiring harness between FAN1/FAN2 fuse and cooling fan control module terminal 1D
•  PCM connector or terminal malfunction
•  Open circuit in wiring harness between fan control module terminal 1C and PCM terminal 318
•  Fan control module malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT FAN CONTROL MODULE CONNECTOR CONDITION
•  Switch the ignition to OFF.
•  Disconnect the fan control module connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 8.
No
Go to the next step.
4
INSPECT FAN CONTROL MODULE GROUND CIRCUIT FOR OPEN
•  Disconnect battery negative terminal.
•  Fan control module component connector is disconnected.
•  Inspect for continuity between fan control module terminals 1A and 2A (wiring harness-side) and body ground.
•  Is there any continuity?
Yes
Go to the next step.
No
Repair or replace wiring harness and/or ground point for a possible open circuit, then go to Step 8.
5
INSPECT FAN CONTROL MODULE POWER SUPPLY CIRCUIT FOR OPEN OR SHORT TO GROUND
•  Reconnect the battery negative terminal.
•  Fan control module connector is disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the fan control module terminal 1D (wiring harness-side).
•  Is the voltage B+?
Yes
Go to the next step.
No
Verify the FAN1 and FAN2 fuse condition.
•  If the FAN1 and/or FAN2 fuse is blown, repair or replace wiring harness for a possible short to ground circuit.
•  If the FAN1 and FAN2 fuse is normal, repair or replace wiring harness for a possible open circuit.
Then go to Step 8.
6
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 8.
No
Go to the next step.
7
INSPECT COOLING FAN CONTROL SIGNAL CIRCUIT FOR OPEN
•  Battery negative terminal is disconnected.
•  Fan control module and PCM connectors are disconnected.
•  Inspect for continuity between fan control module terminal 1C (wiring harness-side) and PCM terminal 318 (wiring harness-side).
•  Is there any continuity?
Yes
Replace the cooling fan component, then go to the next step.
No
Repair or replace the connector and/or terminals, then go to the next step.
8
VERIFY THAT DTC P0483 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.