Mazda CX 7. Manual - part 33

 

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Mazda CX 7. Manual - part 33

 

 

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–87

01-02

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

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

• Have the FREEZE FRAME DATA and 

DIAGNOSTIC MONITORING TEST RESULTS 
(HO2S related) been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA and DIAGNOSTIC 
MONITORING TEST RESULTS 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

VERIFY RELATED PENDING CODE OR 
STORED DTC

• Turn the ignition switch off, then to the ON 

position (Engine off).

• Verify the related PENDING CODE or stored 

DTCs using the M-MDS.

• Are other DTCs present?

Yes

Go to appropriate DTC troubleshooting procedure.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Go to the next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME 
DATA

• Is DTC P0137 on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to the troubleshooting for the DTC on the FREEZE 
FRAME DATA.
(See01-02-13 DTC TABLE[L3 WITH TC].)

5

INSPECT REAR HO2S SIGNAL CIRCUIT FOR 
SHORT TO GROUND AT HARNESS

• Turn the ignition switch off.

• Disconnect rear HO2S and PCM connectors.

• Verify the continuity between rear HO2S 

sensor terminal A (wiring harness side) and 
body ground.

• Is there continuity?

Yes

Repair for a short to ground circuit, then go to Step 7.

No

Go to the next step.

6

INSPECT REAR HO2S SIGNAL CIRCUIT FOR 
SHORT TO GROUND AT REAR HO2S

• Rear HO2S connector disconnected.

• Verify the continuity between rear HO2S 

sensor terminal A (part side) and body ground.

• Is there continuity?

Yes

Replace the rear HO2S then go to the next step.

No

Go to the next step.

7

VERIFY TROUBLESHOOTING OF DTC P0137 
COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the PCM memory using 

the M-MDS.

• Perform the HO2S heater, HO2S and TWC 

Repair Verification Drive Mode.
 (See01-02-10 OBD-II DRIVE MODE[L3 WITH 
TC].)

• Is the PENDING CODE for this DTC present?

Yes

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

No

Go to the next step.

8

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  87 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–88

DTC P0138[L3 WITH TC]

id010239805100

DTC P0138

Rear HO2S circuit high input

DETECTION 

CONDITION

• The PCM monitors the input voltage from the rear HO2S. If the input voltage from the rear HO2S sensor is 

above 1.2 V for 0.8 s, the PCM determines that the circuit input is high.

Diagnostic support note

• This is an intermittent monitor (HO2S).

• The 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 first drive cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE 

CAUSE

• Rear HO2S malfunction

• Short to power supply in the wiring harness between rear HO2S terminal A and PCM terminal 2Q

• Rear HO2S or PCM terminal shorted

• PCM malfunction

REAR HO2S 

PCM

WIRING HARNESS-SIDE CONNECTOR

REAR HO2S

WIRING HARNESS-SIDE CONNECTOR

5

PCM

A

B

2Q

1BC

2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M

2E

2A

2I

2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P

2H

2D

2L

2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O

2G

2C

2K

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

2F

2B

2J

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

A

B

C

D

1871-1U-06B(01-02).fm  88 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–89

01-02

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

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

• Have the FREEZE FRAME DATA and 

DIAGNOSTIC MONITORING TEST RESULTS 
(HO2S related) been recorded?

Yes

Go to the next step.

No

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

2

VERIFY RELATED SERVICE INFORMATION 
AVAILABILITY

• Verify related service bulletins and/or repair 

Information availability.

• Is any related Service Information available?

Yes

Perform the repair or diagnosis according to available 
Service Information.

• If vehicle is not repaired, go to the next step.

No

Go to the next step.

3

VERIFY RELATED PENDING OR STORED DTC

• Turn the ignition switch off, then to the ON 

position. (Engine off)

• Verify pending code or stored DTCs using M-

MDS.

• Is other DTC present?

Yes

Go to the appropriate DTC troubleshooting procedures.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Go to the next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME 
DATA

• Is DTC P0138 on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to the troubleshooting procedures for the DTC on the 
FREEZE FRAME DATA.
(See01-02-13 DTC TABLE[L3 WITH TC].)

5

INSPECT REAR HO2S SIGNAL CIRCUIT FOR 
SHORT TO POWER SUPPLY

• Turn the ignition switch off.

• Disconnect rear HO2S connector.

• Turn the ignition switch to the ON position. 

(Engine off)

• Measure the voltage between rear HO2S 

terminal A (wiring harness-side) and body 
ground.

• Is there any voltage?

Yes

Replace short to power supply, then go to Step 7.

No

Go to the next step.

6

VERIFY CURRENT INPUT SIGNAL STATUS

• Start the engine.

• Access the O2S12 PID using the M-MDS.

• Verify the PID while racing the engine at least 

10 times in NEUTRAL.

• Does the PID stay above 0.55 V?

Yes

Replace the sensor, then go to the next step.
(See01-15-2 EXHAUST SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)

No

Go to the next step.

7

VERIFY TROUBLESHOOTING OF DTC P0138 
COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Turn the ignition switch to the ON position. 

(Engine off)

• Clear the DTC from the memory using the M-

MDS.

• Run the PCM adaptive memory procedure 

drive mode and HO2S heater, HO2S, and TWC 
repair verification drive mode.
(See01-02-10 OBD-II DRIVE MODE[L3 WITH 
TC].)

• 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.

8

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.

1871-1U-06B(01-02).fm  89 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–90

DTC P0139[L3 WITH TC]

id010239805200

Diagnostic procedure

DTC P0139

Rear HO2S circuit problem

DETECTION 

CONDITION

• The PCM monitors the rich (0.4 V) to lean (0.3 V) response time of the rear HO2S. The PCM measures the 

response time when the following conditions are met. The PCM determines that the rear HO2S response 
deteriorated when the measured response time is more than the threshold value (130 ms) five consecutive 
times.

MONITORING CONDITIONS

— HO2S heater, HO2S, and TWC Repair Verification Drive Mode or EGR, HO2S heater, HO2S, TWC, and 

EVAP System Repair Verification Drive Mode

— The following conditions are met:

• Fuel cut during deceleration

• Engine speed is more than 500 rpm.

• Engine coolant temperature is more than 70 °C {158 °F}.

• HO2S (rear) output voltage is more than 0.4 V.

• The PCM monitors for a time-out malfunction (when rear HO2S remains above 0.3 V for longer than a 

specified period of time during fuel cut control). The PCM measure the amount of time from when the 
following conditions are met until the rear HO2S output voltage drops below 0.3 V. The PCM determines 
that a HO2S time-out malfunction has occurred when the detected time is more than the threshold value 
(6.4 s) three consecutive times.

MONITORING CONDITIONS

— HO2S heater, HO2S, and TWC Repair Verification Drive Mode or EGR, HO2S heater, HO2S, TWC, and 

EVAP System Repair Verification Drive Mode

— The following conditions are met:

• Fuel cut during deceleration

• Engine speed is more than 500 rpm.

• Engine coolant temperature is more than 70 °C {158 °F}.

• HO2S (rear) is activated (more than 0.55 V).

Diagnostic support note

• This is an intermittent monitor (HO2S).

• The 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.

• DIAGNOSTIC MONITORING TEST RESULTS is available.

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

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE 

CAUSE

• Rear HO2S deterioration

• Rear HO2S malfunction

• Rear HO2S looseness

• Pressure regulator (built-in fuel pump unit) malfunction

• Fuel pump malfunction

• Fuel filter (built-in fuel pump unit) clogged or restricted

• Fuel leakage on fuel line from fuel delivery pipe to fuel pump

• Exhaust system leakage

• Purge solenoid valve malfunction

• Improper connection of purge solenoid hoses

• Insufficient compression

• Engine malfunction (Leakage engine coolant)

STEP

INSPECTION

ACTION

1

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

• Have the FREEZE FRAME DATA and 

DIAGNOSTIC MONITORING TEST RESULTS 
(HO2S related) been recorded?

Yes

Go to the next step.

No

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

2

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

• Verify related Service Bulletins and/or-line 

repair information availability.

• Is any related repair information available?

Yes

Perform the repair or diagnosis according to the available 
Service Information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

1871-1U-06B(01-02).fm  90 ページ  2006年3月15日 水曜日 午前10時32分

 

 

 

 

 

 

 

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