Mazda CX-7 2007 Workshop Manual page 119

DTC P0131 Front HO2S circuit low input
FRONT HO2S
FRONT HO2S
WIRING HARNESS-SIDE CONNECTOR
1C 1A
1D 1B
Diagnostic procedure
STEP
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?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related Service Bulletins and/or on-line
repair information availability.
• Is any related repair information available?
3 VERIFY RELATED PENDING OR STORED DTC
• Turn the ignition switch off, then to the ON
position (Engine off).
• Verify the pending code or stored DTCs using
the M-MDS.
• Are other DTCs present?
4 IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
• Is DTC P0131 on FREEZE FRAME DATA?
5 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, corrosion).
• Is there any malfunction?
ON-BOARD DIAGNOSTIC [L3 WITH TC]
5 6
1C
5 6 9
1B
5 6 9
1A
2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M
2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z 2V 2R 2N
2C 2A
2D 2B
2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O
2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P
INSPECTION
PCM
9 8
2Z
8
2AC
8
2AD
PCM
WIRING HARNESS-SIDE CONNECTOR
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.
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.
Yes Go to the appropriate DTC troubleshooting procedures.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Go to the next step.
Yes Go to the next step.
No Go to troubleshooting procedures for the DTC on the
FREEZE FRAME DATA.
(See01-02-13 DTC TABLE[L3 WITH TC].)
Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
2I 2E 2A
2J 2F 2B
2G 2C
2K
2L 2H 2D
ACTION
01-02–77
01-02