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Mazda CX 7. Manual - part 65

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–215

01-02

End Of Sie

INSPECT APP SENSOR CONNECTOR FOR
POOR CONNECTION

• Disconnect the APP sensor connector.

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the suspected terminal, then go to Step
10.

Go to the next step.

INSPECT APP SENSOR

• Perform the APP sensor inspection.

(See01-40-33 ACCELERATOR PEDAL
POSITION (APP) SENSOR INSPECTION[L3
WITH TC].)

• Is the APP sensor normal?

Yes

Go to the next step.

Replace the APP sensor, then go to Step 10.

INSPECT APP2 SIGNAL CIRCUIT FOR SHORT
TO POWER SUPPLY

• Turn ignition switch to the ON position (Engine

off).

• Measure the voltage between APP sensor

terminal C (harness-side) and body ground.

• Is the voltage above 4.5 V?

Yes

Repair or replace for a short to power supply. Then, go to
Step 10.

Go to the next step.

VERIFY APP SENSOR GROUND CIRCUIT FOR
OPEN CIRCUIT

• Disconnect the PCM connector.

• Inspect the continuity between APP sensor

terminal B (harness-side) and PCM terminal
1AV (harness-side).

• Is there continuity?

Yes

Repair or replace for an open circuit between APP sensor
terminal C (harness-side) and PCM connector terminal
1AC (harness-side). Then, go to Step 10.

Go to the next step.

INSPECT PCM CONNECTOR FOR POOR
CONNECTION

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair the terminal, then go to Step 10.

Go to the next step.

VERIFY APP SIGNAL CIRCUIT FOR SHORT TO
POWER SUPPLY CIRCUIT

• Inspect the continuity between throttle body

terminals A and C (harness-side).

• Is there continuity?

Yes

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

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P2128
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.

• Start the engine and warm it up completely.

• Is the same DTC present?

Yes

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

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

(See01-14-4 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]

01-02–216

DTC P2135[L3 WITH TC]

id010239812100

Diagnostic procedure

End Of Sie

DTC P2135

TP sensor No.1/No.2 voltage correlation problem

DETECTION

CONDITION

• The PCM compares the input voltage from TP sensor No.1 with the input voltage from TP sensor No.2

when the engine is running. If the difference is more than the specification, the PCM determines that there
is a TP sensor No.1/No.2 voltage correlation problem.

Diagnostic support note

• This is a continuous monitor (CCM).

• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE

CAUSE

• TP sensor No.1 malfunction

• TP sensor No.2 malfunction

• Connector or terminal 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 the FREEZE FRAME DATA on the repair order,
then go to the next step.

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.

Go to the next step.

INSPECT THROTTLE BODY CONNECTOR FOR
POOR CONNECTION

• Turn the ignition switch to off.

• Disconnect the throttle body 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 6.

Go to the next step.

INSPECT TP SENSOR

• Inspect the TP sensor.

(See01-40-32 THROTTLE POSITION (TP)
SENSOR INSPECTION[L3 WITH TC].)

• Is there any malfunction?

Yes

Replace the throttle body, then go to Step 6.
(See01-13-5 INTAKE AIR SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)

Go to the next step.

INSPECT PCM CONNECTOR FOR POOR
CONNECTION

• Turn the ignition switch to off.

• Disconnect the PCM 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 the next step.

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P2135
COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear the DTC from the PCM memory using

the M-MDS.

• Start the engine.

• Is the same DTC present?

Yes

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

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(See01-14-4 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].)

DTC troubleshooting completed.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–217

01-02

DTC P2138[L3 WITH TC]

id010239812200

Diagnostic procedure

End Of Sie

DTC P2138

APP sensor No.1/No.2 voltage correlation problem

DETECTION

CONDITION

• The PCM compares the input voltage from APP sensor No.1 with the input voltage from APP sensor No.2

when the engine is running. If the difference is more than the specification, the PCM determines that there
is an APP sensor No.1/No.2 angle correlation problem.

Diagnostic support note

• This is a continuous monitor (CCM).

• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE

CAUSE

• APP sensor No.1 malfunction

• APP sensor No.2 malfunction

• Connector or terminal 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 the FREEZE FRAME DATA on the repair order,
then go to the next step.

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.

Go to the next step.

INSPECT APP SENSOR CONNECTOR FOR
POOR CONNECTION

• Turn the ignition switch to off.

• Disconnect the APP sensor 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 6.

Go to the next step.

INSPECT APP SENSOR

• Inspect the APP sensor.

(See01-40-33 ACCELERATOR PEDAL
POSITION (APP) SENSOR INSPECTION[L3
WITH TC].)

• Is there any malfunction?

Yes

Replace the APP sensor, then go to Step 6.
(See01-13-17 ACCELERATOR PEDAL REMOVAL/
INSTALLATION[L3 WITH TC].)

Go to the next step.

INSPECT PCM CONNECTOR FOR POOR
CONNECTION

• Turn the ignition switch to off.

• Disconnect the PCM 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 the next step.

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P2138
COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear the DTC from the PCM memory using

the M-MDS.

• Start the engine.

• Is the same DTC present?

Yes

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

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(See01-14-4 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].)

DTC troubleshooting completed.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–218

DTC P2177[L3 WITH TC]

id010239812300

Diagnostic procedure

DTC P2177

Fuel system too lean at off idle

DETECTION

CONDITION

• PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) during closed loop fuel

control at off-idle. If the LONGFT and the sum total of these fuel trims exceed the preprogrammed criteria,
the PCM determines that the fuel system is too lean at off-idle.

Diagnostic support note

• This is a continuous monitor. (Fuel system)

• MIL illuminates if the PCM detects the above malfunctioning 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 conditions during the first drive

cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE

CAUSE

• Misfire

• Front HO2S deterioration

• Front HO2S heater malfunction

• MAF sensor malfunction

• Pressure regulator malfunction

• Fuel pressure sensor malfunction

• Relief valve (built-in fuel delivery pipe) malfunction

• Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction

• High pressure fuel pump malfunction

• Fuel pump malfunction

• Fuel filter clogged or restricted

• Fuel leakage on fuel line

• Exhaust system leakage

• Purge solenoid valve improper operation

• Purge solenoid valve malfunction (stuck open)

• Purge solenoid hoses improper connection

• Air suction in intake-air system

• Insufficient engine compression

• Variable valve timing control system improper operation

• PCM malfunction

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
(Fuel system related) been recorded?

Yes

Go to the next step.

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

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.

Go to the next step.

VERIFY RELATED PENDING CODE OR
STORED DTCS

• Turn the ignition switch to off, then to the ON

position (Engine off).

• Verify related pending code or stored DTCs.

• Are other DTCs present?

Yes

If misfire the DTC is present, go to Step 8.
If other DTCs is present, go to the applicable DTC
inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)

If driveability concern is present, go to Step 8.
If not, go to the next step.

IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA

• Is DTC P2177 on FREEZE FRAME DATA?

Yes

Go to the next step.

Go to troubleshooting procedures for DTC on FREEZE
FRAME DATA.

VERIFY CURRENT INPUT SIGNAL STATUS
(IGNITION SWITCH TO THE ON POSITION/
IDLE)

• Access the APP1, APP2, ECT, MAF, TP and

VSS PIDs using the M-MDS.

• Is there any signal that is far out of specification

when the ignition switch is at the ON position
and the engine runs?

Yes

Inspect the sensor and excessive resistance in related
wiring harnesses.
Repair if necessary.
Then go to Step 20.

Go to the next step.

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Content .. 63 64 65 66 ..