Mazda CX 7. Manual — part 19
ON-BOARD DIAGNOSTIC [L3 WITH TC]
01-02–31
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 heater 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
INSPECT FRONT HO2S CONNECTOR FOR
POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the front HO2S connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 7.
No
Go to the next step.
4
INSPECT FRONT HO2S HEATER CONTROL
CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
• Measure the voltage between front HO2S
terminal 2D (wiring harness-side) and body
ground.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to
power supply, then go to Step 7.
No
Go to the next step.
5
INSPECT FRONT HO2S HEATER
• Inspect the front HO2S heater.
(See01-40-37 HEATED OXYGEN SENSOR
(HO2S) INSPECTION[L3 WITH TC].)
• Is there any malfunction?
Yes
Replace the front HO2S, then go to Step 7.
(See01-15-2 EXHAUST SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)
No
Go to the next step.
6
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to the next step.
No
Go to the next step.
7
VERIFY TROUBLESHOOTING OF DTC P0032
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 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 inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No
DTC troubleshooting completed.
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ON-BOARD DIAGNOSTIC [L3 WITH TC]
01-02–32
DTC P0037[L3 WITH TC]
id010239802200
Diagnostic procedure
DTC P0037
Rear HO2S heater circuit low input
DETECTION
CONDITION
• The PCM monitors the rear HO2S heater output voltage. If the PCM turns the rear HO2S heater on or off
but the rear HO2S heater circuit voltage remains low the PCM determines that the rear HO2S heater circuit
has a malfunction.
Diagnostic support note
• This is a continuous monitor (HO2S heater).
• 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 the first drive
cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
POSSIBLE
CAUSE
• Rear HO2S heater malfunction
• Connector or terminal malfunction
• Open circuit in the wiring harness between ignition switch and rear HO2S terminal C
• Short to ground in the wiring harness between ignition switch and rear HO2S terminal C
• Open circuit in the wiring harness between rear HO2S terminal D and PCM terminal 2D
• Short to ground in the wiring harness between rear HO2S terminal D and PCM terminal 2D
• PCM malfunction
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 heater 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.
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
3
3
4
6
5
REAR HO2S HEATER
2D
PCM
PCM
WIRING HARNESS-SIDE CONNECTOR
C
D
IGNITION SWITCH
REAR HO2S
WIRING HARNESS-SIDE CONNECTOR
A
B
C
D
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ON-BOARD DIAGNOSTIC [L3 WITH TC]
01-02–33
01-02
End Of Sie
3
INSPECT REAR HO2S CONNECTOR FOR
POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the rear HO2S connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
4
INSPECT REAR HO2S HEATER POWER
CIRCUIT FOR OPEN CIRCUIT OR SHORT TO
GROUND
• Turn the ignition switch to the ON position
(Engine off).
• Measure the voltage between rear HO2S
terminal C (wiring harness-side) and body
ground.
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open
circuit or short to ground, then go to Step 9.
5
INSPECT REAR HO2S HEATER CONTROL
CIRCUIT FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between rear HO2S
terminal D (wiring harness-side) and body
ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to
ground, then go to Step 9.
No
Go to the next step.
6
INSPECT REAR HO2S HEATER
• Inspect the rear HO2S heater.
(See01-40-37 HEATED OXYGEN SENSOR
(HO2S) INSPECTION[L3 WITH TC].)
• Is there any malfunction?
Yes
Replace the rear HO2S, then go to Step 9.
(See01-15-2 EXHAUST SYSTEM REMOVAL/
INSTALLATION[L3 WITH TC].)
No
Go to the next step.
7
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
8
INSPECT REAR HO2S HEATER CONTROL
CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between rear HO2S
terminal D (wiring harness-side) and PCM
terminal 2D (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open
circuit, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0037
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 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 inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No
DTC troubleshooting completed.
STEP
INSPECTION
ACTION
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ON-BOARD DIAGNOSTIC [L3 WITH TC]
01-02–34
DTC P0038[L3 WITH TC]
id010239802300
DTC P0038
Rear HO2S heater circuit high input
DETECTION
CONDITION
• The PCM monitors the rear HO2S heater output voltage. If the PCM turns the rear HO2S heater off but the
rear HO2S heater circuit voltage remains high the PCM determines that the rear HO2S heater circuit has a
malfunction.
Diagnostic support note
• This is a continuous monitor (HO2S heater).
• 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 the first drive
cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
POSSIBLE
CAUSE
• Rear HO2S heater malfunction
• Connector or terminal malfunction
• Short to power supply in the wiring harness between rear HO2S terminal D and PCM terminal 2D
• PCM malfunction
REAR HO2S HEATER
2D
PCM
PCM
WIRING HARNESS-SIDE CONNECTOR
C
D
IGNITION SWITCH
A
B
C
D
REAR HO2S
WIRING HARNESS-SIDE CONNECTOR
3
3
5
7
6
4
8
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
1871-1U-06B(01-02).fm 34 ページ 2006年3月15日 水曜日 午前10時32分
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