Mazda CX 7. Manual - part 49

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–151

01-02

DTC P0463[L3 WITH TC]

id010239808200

Diagnostic procedure

End Of Sie

DTC P0463

Fuel gauge sender unit circuit high input

DETECTION 

CONDITION

• The PCM monitors the signals of the fuel level and fuel gauge sender unit output voltage from the 

instrument cluster. If the PCM detects that the fuel level or fuel gauge sender unit output voltage is too high, 
the PCM determines that the fuel gauge sender unit circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (CCM).

• MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in 

one drive cycle while the DTC for the same malfunction has been stored in the PCM.

• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive 

cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE 

CAUSE

• Instrument cluster malfunction

• Fuel gauge sender unit malfunction

• PCM malfunction

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 FREEZE FRAME DATA on the repair order, then go 
to the next step.

2

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

• Check for related Service Bulletins and/or on-

line repair information availability.

• Is any related repair information available?

Yes

Perform the 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 FUEL GAUGE SENDER UNIT

• Turn the ignition switch off.

• Inspect the fuel gauge sender unit.

 (See09-22-14 FUEL GAUGE SENDER UNIT 
INSPECTION.)

• Is the fuel gauge sender unit normal?

Yes

Replace the PCM, then go to the next step.

No

Repair or replace the fuel gauge sender unit, then go to the 
next step.

4

INSPECT INSTRUMENT CLUSTER

• Perform “INSTRUMENT CLUSTER INPUT/

OUTPUT CHECK MODE” procedure.
 (See 09-22-5 INSTRUMENT CLUSTER 
INPUT/OUTPUT CHECK MODE.)

• Is there any malfunction?

Yes

Repair or replace the suspected malfunction, then go to the 
next step.

No

Go to the next step.

5

VERIFY TROUBLESHOOTING OF DTC P0463 
COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Turn ignition switch to the ON position (Engine 

off).

• Clear the DTC from the memory using the M-

MDS.

• Start the engine.

• Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.

No

Go to the next step.

6

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

 (See 01-02-10 AFTER REPAIR 
PROCEDURE[L3 WITH TC].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
 (See 01-02-13 DTC TABLE[L3 WITH TC].)

No

Troubleshooting completed.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–152

DTC P0480[L3 WITH TC]

id010239807400

DTC P0480

Fan control circuit problem

DETECTION 

CONDITION

• The PCM monitors the input voltage from the fan control module No.1. If the voltage remains low or high, 

the PCM determines that the fan control circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (Other).

• The MIL does not illuminate.

• FREEZE FRAME DATA is not available.

• The DTC is stored in the PCM memory.

POSSIBLE 

CAUSE

• Fan control module No.1 malfunction

• Connector or terminal malfunction

• Short to the power supply in the wiring harness between fan control module No.1 terminal 1B and PCM 

terminal 1AE

• Short to ground in the wiring harness between fan control module No.1 terminal 1B and PCM terminal 1AE

• Open circuit in the wiring harness between fan control module No.1 terminal 1B and PCM terminal 1AE

• PCM malfunction

8

6

5

4

3

7

FROM COOLING FAN FUSE

FAN CONTROL MODULE No.1

1AE

PCM

PCM

WIRING HARNESS-SIDE CONNECTOR

FAN CONTROL MODULE No.1

WIRING HARNESS-SIDE CONNECTOR

1A

1B

1C

1A

1B

1C

1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M

1E

1A

1I

1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X

1T

1P

1H

1D

1L

1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O

1G

1C

1K

1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z

1V

1R 1N

1F

1B

1J

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–153

01-02

Diagnostic procedure

End Of Sie

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 Bulletins and/or on-line 

repair information availability.

• Is any related repair information available?

Yes

Perform the 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 No.1 
CONNECTOR FOR POOR CONNECTION

• Turn the ignition switch off.

• Disconnect the fan control module No.1 

connector.

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 9.

No

Go to the next step.

4

INSPECT FAN CONTROL MODULE No.1 
SIGNAL CIRCUIT FOR SHORT TO POWER 
SUPPLY

• Turn the ignition switch to the ON position 

(Engine off).

• Measure the voltage between fan control 

module No.1 terminal 1B (wiring harness-side) 
and body ground.

• Is the voltage B+?

Yes

Repair or replace the wiring harness for an open circuit, 
then go to Step 9.

No

Go to the next step.

5

INSPECT FAN CONTROL MODULE No.1 
SIGNAL CIRCUIT FOR SHORT TO GROUND

• Turn the ignition switch off.

• Inspect for continuity between fan control 

module No.1 terminal 1B (wiring harness-side) 
and body ground.

• Is there continuity?

Yes

Repair or replace the wiring harness for an open circuit, 
then go to Step 9.

No

Go to the next step.

6

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 9.

No

Go to the next step.

7

INSPECT FAN CONTROL module No.1 SIGNAL 
CIRCUIT FOR OPEN CIRCUIT

• Inspect for continuity between fan control 

module No.1 terminal 1B (wiring harness-side) 
and PCM terminal 1AE.

• Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness for an open circuit, 
then go to Step 9.

8

INSPECT FAN CONTROL module No.1

• Perform the fan control module No.1 

inspection.
(See01-03-78 ENGINE CONTROL SYSTEM 
OPERATION INSPECTION[L3 WITH TC].)

• Is the fan control module No.1 normal?

Yes

Go to the next step.

No

Replace the fan control module No.1, then go to the next 
step.

9

VERIFY TROUBLESHOOTING OF DTC P0480 
COMPLETED

• Clear the DTC from the PCM memory using 

the M-MDS.

• Start the engine.

• Turn A/C switch to ON.

• Is the same DTC present?

Yes

Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH 
TC].)

No

Go to the next step.

10

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(See01-02-10 AFTER REPAIR 
PROCEDURE[L3 WITH TC].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Troubleshooting completed.

1871-1U-06B(01-02).fm  153 ページ  ２００６年３月１５日　水曜日　午前１０時３２分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–154

DTC P0481[L3 WITH TC]

id010239815200

Diagnostic procedure

DTC P0481

Fan control circuit problem

DETECTION 

CONDITION

• The PCM monitors the input voltage from the fan control module No.2. If the voltage remains low or high, 

the PCM determines that the fan control circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (Other).

• The MIL does not illuminate.

• FREEZE FRAME DATA is not available.

• The DTC is stored in the PCM memory.

POSSIBLE 

CAUSE

• Fan control module No.2 malfunction

• Connector or terminal malfunction

• Short to the power supply in the wiring harness between fan control module No.2 terminal 2B and PCM 

terminal 1R

• Short to ground in the wiring harness between fan control module No.2 terminal 2B and PCM terminal 1R

• Open circuit in the wiring harness between fan control module No.2 terminal 2B and PCM terminal 1R

• PCM malfunction

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 Bulletins and/or on-line 

repair information availability.

• Is any related repair information available?

Yes

Perform the 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 No.2 
CONNECTOR FOR POOR CONNECTION

• Turn the ignition switch off.

• Disconnect the fan control module No.2 

connector.

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 9.

No

Go to the next step.

8

6

5

4

3

7

FROM COOLING FAN FUSE

FAN CONTROL MODULE No.2

1R

PCM

PCM

WIRING HARNESS-SIDE CONNECTOR

FAN CONTROL MODULE No.2

WIRING HARNESS-SIDE CONNECTOR

2A

2B

2C

2A

2B

2C

1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M

1E

1A

1I

1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X

1T

1P

1H

1D

1L

1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O

1G

1C

1K

1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z

1V

1R 1N

1F

1B

1J

1871-1U-06B(01-02).fm  154 ページ  ２００６年３月１５日　水曜日　午前１０時３２分