DTC P0172, P0175 [MZI-3.5]
DTC P0172, P0175 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DTC P0172, P0175 (MZI-3.5) DIAGNOSTIC PROCEDURE
z
Is the PENDING CODE for this
DTC present?
14
VERIFY AFTER REPAIR
PROCEDURE
z
Perform "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR
PROCEDURE [MZI-3.5]
.)
z
Are any DTC present?
Yes
Go to the applicable DTC inspection.
(See
DTC TABLE [MZI-3.5]
.)
No
Troubleshooting completed.
DTC P0172
P0172: System too rich (RH)
DTC P0175
P0175: System too rich (LH)
DETECTION
CONDITION
z
P0172 indicates that the fuel/air ratio is too rich (RH).
z
P0175 indicates that the fuel/air ratio is too rich (LH).
z
The adaptive fuel strategy continuously monitors the fuel delivery hardware.
The test fails when the adaptive fuel tables reach a rich calibrated limit.
POSSIBLE CAUSE
Fuel System:
z
Damaged or leaking fuel pulse damper
z
Leaking fuel injectors
z
Fuel return line restricted
z
Fuel rail pressure sensor bias
z
Purge solenoid valve is leaking when the canister is full
Base engine:
z
Engine oil contamination
Intake Air System
z
Damaged or contaminated MAF sensor
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA
Yes
Go to the next step.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:30 AM
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