Dtc P2177 [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
(See AFTER REPAIR PROCEDURE
• Are any DTCs present?
DTC P2177
• The PCM monitors short term fuel trim (SHRTFT) and long term fuel trim (LONGFT)
during closed loop fuel control during off-idle. If the LONGFT or the sum total of these
fuel trims exceed preprogrammed criteria, PCM determines that fuel system is too
lean during off-idle.
Diagnostic support note
• This is a continuous monitor. (Fuel system)
• MIL illuminates if PCM detects the above malfunctioning condition in two consecutive
DETECTION
CONDITION
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 PCM detects the above malfunction conditions
during first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
• Misfire
• Front HO2S deterioration
• Front HO2S heater malfunction
• MAF sensor malfunction
• Pressure regulator (built-in fuel pump unit) malfunction
• Fuel pump malfunction
• Fuel filter clogged or restricted
• Fuel leakage on fuel line from fuel delivery pipe and fuel pump
POSSIBLE
CAUSE
• Leakage exhaust system
• Purge solenoid valve improper operation
• Purge solenoid valve malfunction (stuck open)
• Purge solenoid hoses improper connection
• Air suction in intake-air system
• Insufficient engine compression
• Variable valve timing control system improper operation
Diagnostic procedure
Downloaded from
[Z6].)

DTC P2177 [Z6]

System too lean off idle
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B3E010202100W07