POSSIBLE CAUSE
z
Contaminated HO2S
z
Exhaust leaks
z
Open circuit in wiring harness between PCM terminal 2Y (wiring harness-
side) and front HO2S (RH) terminal B (wiring harness-side)
z
Open circuit in wiring harness between PCM terminal 2BG (wiring harness-
side) and rear HO2S (RH) terminal B (wiring harness-side)
z
Open circuit in wiring harness between PCM terminal 2U (wiring harness-
side) and front HO2S (LH) terminal B (wiring harness-side)
z
Open circuit in wiring harness between PCM terminal 2BC (wiring harness-
side) and rear HO2S (LH) terminal B (wiring harness-side)
z
Open circuit in wiring harness between PCM terminal 2AL (wiring harness-
side) and HO2S terminal D (wiring harness-side)
z
Short to ground in wiring harness between PCM terminal 1BJ (wiring
harness-side) and PCM terminal 2Y (wiring harness-side)
z
Short to ground in wiring harness between PCM terminal 1BJ (wiring
harness-side) and PCM terminal 2BG (wiring harness-side)
z
Short to ground in wiring harness between PCM terminal 1BJ (wiring
harness-side) and PCM terminal 2U (wiring harness-side)
z
Short to ground in wiring harness between PCM terminal 1BJ (wiring
harness-side) and PCM terminal 2BC (wiring harness-side)
z
Short to ground in wiring harness between HO2S terminal A (wiring
harness-side) and battery negative terminal
z
Short to ground in wiring harness between HO2S terminal A (wiring
harness-side) and HO2S terminal C (wiring harness-side)
z
Short to ground in wiring harness between HO2S terminal A (wiring
harness-side) and HO2S terminal D (wiring harness-side)
z
Short to ground in wiring harness between HO2S terminal A (wiring
harness-side) and HO2S terminal B (wiring harness-side)
z
Short to ground in wiring harness between PCM terminal 2J and front HO2S
(RH) terminal A
z
Short to ground in wiring harness between PCM terminal 2AS and front
HO2S (LH) terminal A
z
Short to ground in wiring harness between PCM terminal 2E and rear HO2S
(RH) terminal A
z
Short to ground in wiring harness between PCM terminal 2AO and rear
HO2S (LH) terminal A
z
Incorrect fueling
z
MAF sensor malfunction
z
Deteriorating HO2S
z
Inlet air leaks
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
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