Mazda CX 7. Manual - part 64

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–211

01-02

End Of Sie

4

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.

No

Go to the next step.

5

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.

No

Replace the APP sensor, then go to Step 10.

6

INSPECT APP1 SIGNAL CIRCUIT FOR SHORT 
TO POWER SUPPLY

• Turn ignition switch to the ON position (Engine 

off).

• Measure the voltage between APP sensor 

terminal F (harness-side) and body ground.

• Is the voltage above 4.8 V?

Yes

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

No

Go to the next step.

7

VERIFY APP SENSOR GROUND CIRCUIT FOR 
OPEN CIRCUIT

• Disconnect the PCM connector.

• Inspect for continuity between APP sensor 

terminal E (harness side) and PCM terminal 
1U (harness side).

• Is there continuity?

Yes

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

No

Go to the next step.

8

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.

No

Go to the next step.

9

VERIFY TP SIGNAL CIRCUIT FOR SHORT TO 
POWER SUPPLY CIRCUIT

• Inspect for continuity between throttle body 

terminals D and F (harness side).

• Is there continuity?

Yes

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

No

Go to the next step.

10

VERIFY TROUBLESHOOTING OF DTC P2123 
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].)

No

Go to the next step.

11

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].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–212

DTC P2127[L3 WITH TC]

id010239811900

DTC P2127

Accelerator pedal position (APP) sensor No.2 circuit low input

DETECTION 

CONDITION

• The PCM monitors the APP sensor No.2 signal. If the PCM detects that the APP sensor No.2 voltage is 

below 0.2 V, the PCM determines that the APP sensor No.2 circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (CCM).

• MIL illuminates 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

• APP sensor malfunction

• Connector or terminal malfunction

• Open circuit between APP sensor terminal C and PCM terminal 1AC

• Short to ground circuit between APP sensor terminal C and PCM terminal 1AC

• Open circuit between APP sensor terminal A and PCM terminal 1AJ

A

C

B

PCM

APP SENSOR

3

4

5

6

3

7

1AJ

1AC

1AV

D

E

F

APP SENSOR

WIRING HARNESS SIDE CONNECTOR

PCM

WIRING HARNESS SIDE CONNECTOR

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]

01-02–213

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 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

CLASSIFY APP SENSOR OR HARNESS 
MALFUNCTION

• Connect the M-MDS.

• Access the APP2 PID.

• Disconnect the throttle body connector.

• Connect a jumper wire between APP sensor 

terminals A and C (harness-side).

• Is the PID approx. 100%?

Yes

Go to the next step.

No

Go to step 5.

4

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

Inspect for poor APP sensor connector terminal A 
connection. Repair or replace if necessary, then go to Step 
8.

No

Replace the APP sensor, then go to Step 8.

5

INSPECT POWER SUPPLY CIRCUIT VOLTAGE 
AT APP SENSOR CONNECTOR

• Turn ignition switch to the ON position (Engine 

off).

• Measure the voltage at APP sensor terminal A 

(harness-side).

• Is the voltage within 4.5— 5.5 V?

Yes

Go to the next step.

No

Repair or replace for an open circuit between APP sensor 
connector terminal A and PCM connector terminal 1AJ 
(harness-side).
Then, then go to Step 8.

6

VERIFY APP2 SIGNAL CIRCUIT FOR OPEN 
CIRCUIT

• Turn the ignition switch to off.

• Inspect for continuity between APP sensor 

terminal C (harness-side) and PCM terminal 
1AC (harness-side).

• Inspect for continuity between APP sensor 

terminal A (harness-side) and PCM terminal 
1AT (harness-side).

• Is there continuity?

Yes

Go to the next step.

No

Repair or replace the suspected wiring harness, then go to 
Step 8.

7

VERIFY APP2 SIGNAL CIRCUIT FOR SHORT 
TO GROUND

• Inspect for continuity between APP sensor 

terminal C (harness-side) and body ground.

• Is there continuity?

Yes

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

No

Go to the next step.

8

VERIFY TROUBLESHOOTING OF DTC P2127 
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 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].)

No

Go to the next step.

9

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].)

No

Troubleshooting completed.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–214

DTC P2128[L3 WITH TC]

id010239812000

Diagnostic procedure

DTC P2128

Accelerator pedal position (APP) sensor No.2 circuit high input

DETECTION 

CONDITION

• The PCM monitors the APP sensor No.2 signal. If the PCM detects that the APP sensor No.2 voltage is 

above 4.5 V, the PCM determines that the APP sensor No.2 circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (CCM).

• MIL illuminates 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

• APP sensor malfunction

• Connector or terminal malfunction

• Open circuit between APP sensor terminal B and PCM terminal 1AV

• Short to power supply circuit between APP sensor terminal C and PCM terminal 1AC

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 APP SENSOR CONNECTOR

• Turn the ignition switch to off.

• Verify that the APP sensor connector is 

connected securely.

• Is the connector normal?

Yes

Go to the next step.

No

Connect the connector securely, then go to Step 10.

PCM

APP SENSOR

3

7

3

3

4

8

5

4

4

8

8

6

9

A

C

B

1AJ

1AC

1AV

D

E

APP SENSOR

WIRING HARNESS SIDE CONNECTOR

PCM

WIRING HARNESS SIDE CONNECTOR

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

9

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