Mazda 6 2002 Workshop Manual page 208

DTC P0134 Front HO2S circuit no activity detected
Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
2 VERIFY RELATED PENDING AND STORED
DTCS
Note
• If fuel monitor DTC, DTC P0131or P0132 is
retrieved, ignore it until P0134 is fied.
• Turn ignition key to OFF, then ON (Engine
OFF).
• Verify pending and stored DTCs using WDS or
equivalent.
• Is other DTC present?
3 IDENTIFY TRIGGER DTC FOR FREEZE FRAME
DATA
• Is DTC P0134 on FREEZE FRAME DATA?
4 VERIFY CURRENT INPUT SIGNAL STATUS
• Warm up engine.
• Access O2S11 PID using WDS or equivalent.
• Verify PID while racing engine (in NEUTRAL
(MTX) or PARK (ATX)).
• Is PID reading okay?
— More than 0.55 V when suddenly depress
accelerator pedal (rich condition).
— Less than 0.55 V just after release of
accelerator pedal (lean condition)
5 INSPECT INSTALLATION OF FRONT HO2S
• Check if front HO2S is loosely installed.
• Is sensor installed securely?
ON-BOARD DIAGNOSTIC
INSPECTION
Yes Go to net step.
No Intermittent concern eists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
Yes Go to appropriate DTC troubleshooting procedures.
No Go to net step.
Yes Go to net step.
No Go to troubleshooting procedures for DTC on FREEZE
FRAME DATA.
(See F–67 DTC TABLE.)
Yes Go to step 7.
No Go to net step.
Yes Go to net step.
No Install sensor securely, then go to Step 9.
ACTION
F–111
F