Mazda CX-7 2007 Workshop Manual page 125

STEP
14 VERIFY TROUBLESHOOTING OF DTC P0133
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn the ignition switch to the ON position.
(Engine off)
• Clear the DTC from the 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?
15 VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
End Of Sie
DTC P0134[L3 WITH TC]
DTC P0134 Front HO2S no activity detected
• The PCM monitors the input voltage from the HO2S when the following conditions are met. If under the
following monitoring conditions, the input voltage more than 3.22 V, the PCM determines that the front
HO2S is not activated.
MONITORING CONDITIONS
— HO2S, HO2S heater and TWC Repair Verification Drive Mode
— The following conditions are met
• Front HO2S heater is tuned on for above 30 s
DETECTION
• Battery voltage: 10— 18 V
CONDITION
Diagnostic support note
• This is an intermittent monitor (HO2S).
• 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 first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
• Front HO2S deterioration
• Front HO2S heater malfunction
• Leakage exhaust system
• Open or short circuit in the wiring harness between front HO2S terminal 2D and PCM terminal 2C
POSSIBLE
• Open or short circuit in the wiring harness between front HO2S terminal 1C and PCM terminal 2Z
CAUSE
• Open or short circuit in the wiring harness between front HO2S terminal 1B and PCM terminal 2AC
• Open or short circuit in the wiring harness between front HO2S terminal 1A and PCM terminal 2AD
• Insufficient compression
• Engine malfunction
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
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 troubleshooting.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION
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