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Mazda CX 7. Manual - part 48

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–147

01-02

DTC P0456[L3 WITH TC]

id010239807900

Diagnostic procedure

DTC P0456

Evaporative emission control system leak detected (very small leak)

DETECTION

CONDITION

• PCM measures the pump load current (EVAP line pressure) when a specified period has passed after the

EVAP system is sealed when monitoring conditions are met. If the load does not reach the reference load
value or the rate of the load increase is lower than the specification within a specified period, the PCM
determines that the EVAP system has a very small leak.

MONITORING CONDITION

— IG switch OFF

— IAT: 5— 35

°C {40— 95 °F}

— Battery voltage: 11— 20 V

— Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above

— Fuel tank level: 15— 85%

Diagnostic support note

• This is an intermittent monitor (Evaporative system monitor).

• 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.

• DIAGNOSTIC MONITORING TEST RESULT is available.

POSSIBLE

CAUSE

• Purge solenoid valve malfunction

• EVAP system leak detection pump malfunction

• Charcoal canister malfunction

• Fuel cap malfunction

• Fuel tank malfunction

• Fuel pump unit poor seal

• EVAP hose damaged or loose

• EVAP pipe damaged

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA AND
DIAGNOSTIC MONITORING TEST RESULTS
HAVE BEEN RECORDED

• Have the FREEZE FRAME DATA and

DIAGNOSTIC MONITORING TEST RESULTS
(Evaporative emission system related) been
recorded?

Yes

Go to the next step.

Record FREEZE FRAME DATA and DIAGNOSTIC
MONITORING TEST RESULTS on the repair order, then
go to the next step.

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.

Go to the next step.

VERIFY RELATED PENDING CODE OR
STORED DTCS

• Turn the ignition switch off then ON position

(Engine off).

• Verify related PENDING CODE or stored

DTCs.

• Are other DTC present?

Yes

Go to the appropriate DTC inspection.

Go to the next step.

CLASSIFY INTERMITTENT CONCERN OR
CONTINUOUS CONCERN

• Perform the evaporative system leak

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

• Does the system test result fail?

Yes

Go to the next step.

Intermittent concern exists. Inspect the purge solenoid
valve and the EVAP system leak detection pump circuit for
an intermittent concern.
(See01-03-76 INTERMITTENT CONCERN
TROUBLESHOOTING[L3 WITH TC].)

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–148

End Of Sie

LOCATE LEAK POINT

• Check for leakage for the following using the

Evaporative Emission Tester

— Charcoal canister

— Catch tank

— Fuel filler cap

— EVAP hoses and pipes

— Fuel tank

• Is leakage found?

Yes

Repair the leakage or replace the part, then go to Step 10.

Go to the next step.

INSPECT PURGE SOLENOID VALVE

• Inspect if the purge solenoid valve is stuck

closed.
(See01-16-9 PURGE SOLENOID VALVE
INSPECTION[L3 WITH TC].)

• Is the purge solenoid valve normal?

Yes

Go to the next step.

Replace the purge solenoid valve, then go to Step 10.

INSPECT EVAP SYSTEM LEAK DETECTION
PUMP

• Connect all disconnected connectors and

hoses.

• Place a clamp on the EVAP system leak

detection pump hose between the EVAP
system leak detection pump and the air filter.

• Perform the evaporative system leak

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

• Does the test result fail?

Yes

Go to Step 9.

Go to the next step.

CONFIRM EVAP SYSTEM LEAK DETECTION
PUMP LEAKAGE

• Remove the clamp.

• Perform the evaporative system leak

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

• Does the test result fail?

Yes

Replace the EVAP system leak detection pump, then go to
Step 10.

Go to the next step.

INSPECT FUEL PUMP UNIT INSTALLATION

• Remove the fuel tank.

• Visually inspect for damage, insufficient sealing

or a poorly installed pump unit.

• Is it normal?

Yes

Go to the next step.

Repair or replace the fuel tank or sealing, then go to the
next step.

PERFORM LEAK INSPECTION

• Connect all disconnected connectors and

hoses.

• Perform the evaporative system leak

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

• Does the test result fail?

Yes

Leakage still exists. Locate the leak point and repair.
Then go to the next step.

Go to next step

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].)

Troubleshooting completed.

STEP

INSPECTION

ACTION

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–149

01-02

DTC P0461[L3 WITH TC]

id010239808000

Diagnostic procedure

End Of Sie

DTC P0461

Fuel gauge sender unit circuit range/performance

DETECTION

CONDITION

• PCM monitors the fuel level voltage difference before and after the PCM-calculated fuel consumption has

reached 25 L {26.4 US qt., 22 Imp qt.}. If the difference is 5% less than the PCM-calculated fuel
consumption, the PCM determines that the fuel gauge sender unit range/performance is in error.

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

• Fuel gauge sender unit malfunction or substandard performance

• Instrument cluster malfunction

• PCM malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED

• Has the FREEZE FRAME DATA been

recorded?

Yes

Go to the next step.

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

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.

Go to the next step.

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.

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

INSPECT INSTRUMENT CLUSTER

• Perform the “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.

Go to the next step.

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].)

Troubleshooting completed.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–150

DTC P0462[L3 WITH TC]

id010239808100

Diagnostic procedure

End Of Sie

DTC P0462

Fuel gauge sender unit circuit low 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 low,
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 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

VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED

• Has the FREEZE FRAME DATA been

recorded?

Yes

Go to the next step.

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

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.

Go to the next step.

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.

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

INSPECT INSTRUMENT CLUSTER

• Perform the “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.

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P0462
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 PCM, then go to the next step.

Go to the next step.

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].)

Troubleshooting completed.

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