Mazda 6 2002 - Page 212

ON-BOARD DIAGNOSTIC
F115
F
Diagnostic procedure
STEP INSPECTION ACTION
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
2 VERIFY RELATED PENDING AND STORED
DTCS
Note
• If fuel monitor DTC, DTC P0131or P0132 is
retrieved, ignore it until P0140 is fixed.
• Turn ignition key to OFF, then ON (Engine
OFF).
• Verify pending and stored DTCs using WDS or
equivalent.
• Is other DTC present?
Yes Go to appropriate DTC troubleshooting procedures.
(See F67 DTC TABLE.)
No Go to next step.
3 IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
• Is DTC P0140 on FREEZE FRAME DATA?
Yes Go to next step.
No Go to troubleshooting procedures for DTC on FREEZE
FRAME DATA.
(See F67 DTC TABLE.)
4 VERIFY CURRENT INPUT SIGNAL STATUS
• Warm up engine.
• Access O2S12 for P0140 or O2S22 for P0160
PID using WDS or equivalent.
• Verify PID while racing engine at least 10
times (in NEUTRAL (MTX) or PARK (ATX)).
• Is PID reading okay?
 More than 0.55 V at least once during
engine racing.
Yes Go to step 7.
No Go to next step.
5 INSPECT INSTALLATION OF REAR HO2S
• Check if rear HO2S is loosely installed.
• Is sensor installed securely?
Yes Go to next step.
No Install sensor securely, then go to Step 9.
DTC P0140 Rear HO2S circuit no activity detected