Mazda CX 7. Manual — part 51

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–159

01-02

End Of Sie

DTC P0505[L3 WITH TC]

id010239808500

Diagnostic procedure

4

VERIFY TROUBLESHOOTING OF DTC P0500
COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Turn ignition switch to the ON position (Engine

off).

• Clear the DTC from the PCM memory using

the M-MDS.

• Warm up the engine.

• Access the RPM and LOAD PID using the M-

MDS.

• Drive the vehicle under the following conditions

for 18s.
— Engine speed: 2,000 rpm or above

— Gear: Gear is in other than NEUTRAL

— Load: 40% or above

• Is the PENDING CODE for this 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.

5

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 troubleshooting.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0505

IAC system problem

DETECTION

CONDITION

• The PCM cannot control idle speed toward the target idle speed during the KOER self test.

POSSIBLE

CAUSE

• Air cleaner element clogged

• Air intake passage clogged

• A/C relay control circuit malfunction

• Generator control circuit malfunction

• Low engine compression (Over capacity of blow-by gas)

• Electronic throttle control system improper operation

• PCM malfunction

STEP

INSPECTION

ACTION

1

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.

2

VERIFY RELATED PENDING OR STORED DTCs

• Turn the ignition switch off then to the ON

position. (Engine off)

• Verify pending code or stored DTCs using the

M-MDS.

• Are DTCs P0506, P0507, P0638, P2100,

P2101, P2102, P2103, P2108, or P2119
present?

Yes

Perform the applicable DTC troubleshooting.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Go to the next step.

3

VERIFY ELECTRONIC THROTTLE CONTROL
SYSTEM OPERATION

• Perform the TP sweep inspection.

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

• Does the electronic throttle control system

work properly?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to the
inspection result.
Then go to Step 9.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–160

End Of Sie

DTC P0506[L3 WITH TC]

id010239808600

4

INSPECT A/C MAGNETIC CLUTCH OPERATION

Note

• The following test should be performed for

vehicles with A/C. Go to the next step for
vehicles without A/C

• Turn the fan switch off.

• Is the magnetic clutch still on?

Yes

Go to “A/C ALWAYS ON / A/C COMPRESSOR RUNS
CONTINUOUSLY.” of ENGINE SYMPTOM
TROUBLESHOOTING then go to Step 9.
(See01-03-5 ENGINE SYMPTOM
TROUBLESHOOTING[L3 WITH TC].)

No

Go to the next step.

5

INSPECT GENERATOR CONTROL CIRCUIT
MALFUNCTION

• Apply electrical load.

• Does the engine speed increase?

Yes

Go to the next step.

No

Repair for a short to the power supply in the generator
control circuit, then go to Step 9.

6

INSPECT AIR CLEANER ELEMENT

• Remove the air cleaner element with the

engine running.

• Does the engine speed increase?

Yes

Clean or replace the air cleaner element, then go to Step 9.

No

Go to the next step.

7

INSPECT THROTTLE BODY PASSAGE

• Is the throttle body clogged?

Yes

Clean or replace the throttle body passage, then go to Step
9.

No

Go to the next step.

8

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

(See01-10-9 COMPRESSION
INSPECTION[L3 WITH TC].)

• Is the engine compression normal?

Yes

Go to the next step.

No

Overhaul the engine, then go to the next step.

9

VERIFY TROUBLESHOOTING OF DTC P0505
COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear the DTC using the M-MDS.

• Perform the KOER Self-Test.

• 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 troubleshooting.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0506

Idle control system RPM lower than expected

DETECTION

CONDITION

• Actual idle speed is lower than expected by 100 rpm for 14 s when the brake pedal is depressed (brake

switch is on) and the steering wheel is held straight ahead (power steering pressure switch is off).

Note

• If the atmospheric pressure is less than 72.3 kPa {542 mmHg, 21.3 inHg} or the intake air temperature

is below –10

°C {14 °F}, the PCM cancels the diagnosis of P0506.

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 PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in PCM memory.

POSSIBLE

CAUSE

• Electronic throttle control system malfunction

• Air cleaner element clogged

• Air intake passage clogged

• A/C relay control circuit malfunction

• Generator malfunction

• Purge solenoid valve malfunction

• Low engine compression (Over capacity of blow-by gas)

• PCM malfunction

1871-1U-06B(01-02).fm 160 ページ ２００６年３月１５日 水曜日 午前１０時３２分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–161

01-02

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

2

VERIFY RELATED SERVICE 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, then go to the next step.

No

Go to the next step.

3

VERIFY RELATED PENDING OR STORED
DTCS

• Turn ignition switch to OFF, then ON (Engine

off).

• Verify pending code or stored DTCs using the

M-MDS.

• Are other DTCs present?

Yes

Repair the applicable DTCs.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Go to the next step.

4

INSPECT A/C MAGNET CLUTCH OPERATION

• Turn the blower motor switch off.

• Is the magnet clutch still on?

Yes

Refer to “A/C is always on or A/C compressor runs
continuously.” of ENGINE SYMPTOM
TROUBLESHOOTING, then go to Step 11.
(See01-03-69 NO.24 A/C IS ALWAYS ON OR A/C
COMPRESSOR RUNS CONTINUOUSLY[L3 WITH TC].)

No

Go to the next step.

5

INSPECT ELECTRONIC THROTTLE CONTROL
SYSTEM MALFUNCTION

• Inspect the following parts:

— APP sensor

(See01-40-33 ACCELERATOR PEDAL

POSITION (APP) SENSOR
INSPECTION[L3 WITH TC].)

— TP sensor

(See01-40-32 THROTTLE POSITION (TP)

SENSOR INSPECTION[L3 WITH TC].)

• Are they normal?

Yes

Go to the next step.

No

Replace the necessary parts, then go to Step 11.

6

INSPECT PURGE SOLENOID VALVE
MALFUNCTION

• Perform the purge solenoid valve inspection.

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

• Is the purge solenoid valve normal?

Yes

Go to the next step.

No

Replace the purge solenoid valve, then go to Step 11.

7

INSPECT AIR CLEANER ELEMENT

• Remove the air cleaner element with the

engine running.

• Does the engine speed increase?

Yes

Replace the air cleaner element, then go to Step 11.

No

Go to the next step.

8

INSPECT THROTTLE BODY PASSAGE

• Is the throttle body clogged?

Yes

Clean or replace the throttle body passage, then go to Step
11.

No

Go to the next step.

9

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

(See01-10-9 COMPRESSION
INSPECTION[L3 WITH TC].)

• Is the engine compression normal?

Yes

Go to the next step.

No

Overhaul the engine, then go to Step 11.

10

INSPECT GENERATOR

• Perform the generator inspection.

(See01-17-6 GENERATOR INSPECTION[L3
WITH TC].)

• Is the generator normal?

Yes

Go to the next step.

No

Repair or replace the related part, then go to the next step.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–162

End Of Sie

DTC P0507[L3 WITH TC]

id010239808700

Diagnostic procedure

11

VERIFY TROUBLESHOOTING OF DTC P0506
COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Start the engine.

• Clear the DTC from the PCM memory using

the M-MDS.

• Depress the brake pedal for 14 s or more.

• Is PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.

No

Go to the next step.

12

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.

STEP

INSPECTION

ACTION

DTC P0507

Idle control system RPM higher than expected

DETECTION

CONDITION

• Actual idle speed is higher than expected by 200 rpm for 14 s when the brake pedal is depressed (brake

switch is on) and steering wheel is held straight ahead (power steering pressure switch is off).

Note

• If the atmospheric pressure is less than 72.3 kPa {542 mmHg, 21.3 inHg} or the intake air temperature

is below –10

°C {14 °F}, the PCM cancels diagnosis of P0507.

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 PCM memory.

POSSIBLE

CAUSE

• Electronic throttle control system malfunction

• Vacuum hose misconnection

• 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 SERVICE 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, then go to the next step.

No

Go to the next step.

3

VERIFY RELATED PENDING OR STORED
DTCS

• Turn ignition switch to off, then ON position

(Engine off).

• Verify pending code or stored DTCs using the

M-MDS.

• Are other DTCs present?

Yes

Repair applicable DTCs.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Go to the next step.

4

INSPECT VACUUM HOSE CONNECTION

• Are the vacuum hoses connecting accurately?

(See01-13-4 VACUUM HOSE ROUTING
DIAGRAM[L3 WITH TC].)

Yes

Go to the next step.

No

Reconnect the vacuum hoses correctly, then go to step 6.

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