Mazda CX-7 2007 Workshop Manual page 284

STEP
3 VERIFY RELATED PENDING CODE OR
STORED DTC
• Turn the ignition switch to off, then ON position
(Engine off).
• Verify the related PENDING CODE or stored
DTCs using the M-MDS.
• Is the DTC P0030, P0031 or P0032 also
present?
4 IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
• Is DTC P2251 on FREEZE FRAME DATA?
5 INSPECT FRONT HO2S CONNECTOR FOR
POOR CONNECTION
• Turn the ignition switch to off.
• Disconnect the front HO2S connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, and corrosion).
• Is there any malfunction?
6 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, and corrosion).
• Is there any malfunction?
7 INSPECT FRONT HO2S NEGATIVE CURRENT
CONTROL CIRCUIT FOR OPEN AT PCM -
FRONT HO2S
• The front HO2S and the PCM connectors
disconnected.
• Verify the continuity between the PCM terminal
2AC and the front HO2S terminal 1B at
harness-side connectors.
• Is there continuity?
8 VERIFY TROUBLESHOOTING OF DTC P2251
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 same DTC present?
9 VERIFY AFTER REPAIR PROCEDURE
• Perform the AFTER REPAIR PROCEDURE.
(See01-14-4 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
End Of Sie
WM: DTC P24XX
01-02–242
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Go to appropriate DTC troubleshooting procedure.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Go to the next step.
Yes Go to the next step.
No Go to troubleshooting for DTC on FREEZE FRAME DATA.
(See01-02-13 DTC TABLE[L3 WITH TC].)
Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
Yes Replace the front HO2S, then go to the next step.
No Repair or replace for open circuit, then go to the next step.
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.
Yes Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION