Mazda DTC P2177 Diagnostic

DTC P2177     System too lean off idle   DETECTION CONDITION • 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…

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Mazda DTC P0660 Diagnostic

DTC P0660     Variable intake-air control circuit/open   DETECTION CONDITION • The PCM monitors the variable intake-air control signal at PCM terminals 2AS and 2AO. If the PCM turns the variable intake-air shutter valve actuator to open or close but the voltages at PCM terminals 2AS and 2AO do not coincide with the PCM signal…

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Mazda DTC P0443 Diagnostic

DTC P0443     Purge solenoid valve circuit problem   DETECTION CONDITION • The PCM monitors the input voltages from the purge solenoid valve. If the voltage at PCM terminal 2AN remains low or high, the PCM determines that the purge solenoid valve circuit has malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The…

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Mazda DTC P2088 Diagnostic

DTC P2088     Variable valve timing control circuit low   DETECTION CONDITION • If the PCM detects that the OCV drive current is less than the specification* when the OCV control duty target is approx. 100 %, the PCM determines that the variable valve timing control circuit low. *: Detected specification value depends on the battery voltage….

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Mazda DTC P0012 Diagnostic

DTC P0012     CMP-timing over-retarded   DETECTION CONDITION • The actual valve timing is over-retarded from the target valve timing when the OCV system control is within feed-back range. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or…

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Mazda DTC P2178 Diagnostic

DTC P2178     System too rich off idle   DETECTION CONDITION • The PCM monitors short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) during closed loop fuel control at off-idle. If the LONGFT or the sum total of these fuel trims exceed preprogrammed criteria, PCM determines that fuel system is too rich…

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Mazda DTC P0031 Diagnostic

DTC P0031     Front HO2S heater control circuit low   DETECTION CONDITION • The PCM monitors front HO2S heater control voltage at PCM terminal 2AM. If PCM turns front HO2S heater off but front HO2S heater circuit has low voltage, PCM determines that front HO2S heater circuit has malfunction. Note • Front HO2S heater is controlled…

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Mazda DTC P0071 Diagnostic

DTC P0071     Ambient air thermistor circuit failure   DETECTION CONDITION Open circuit or short to power supply or GND in wiring harness between PJB and ambient temperature sensor POSSIBLE CAUSE • Open circuit in wiring harness between PJB terminal J-02 AD and ambient temperature sensor terminal A • Open circuit in wiring harness between PJB…

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Mazda DTC P0103 Diagnostic

DTC P0103     MAF sensor circuit high input   DETECTION CONDITION • The PCM monitors the input voltage from the MAF sensor when the engine running. If the input voltage at PCM terminal 1AC is above 4.9 V, the PCM determines that the MAF circuit has malfunction. Diagnostic support note • This is a continuous monitor (CCM)….

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Mazda DTC P0733 Diagnostic

DTC P0733     Gear 3 incorrect (incorrect gear ratio detected)   DETECTION CONDITION • The PCM monitors revolution ratio of forward clutch drum revolution to differential gear case revolution when the following monitoring conditions are met. If the revolution ratio is below 0.86 or 1.25 or more, the PCM determines that there is a malfunction. Monitoring…

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Mazda DTC P0038 Diagnostic

DTC P0038     Rear HO2S heater circuit high input   DETECTION CONDITION • The PCM monitors the rear HO2S heater control signal at PCM terminal 2C. If the PCM turns the rear HO2S heater on but the rear HO2S heater circuit has high voltage, the PCM determines that the rear HO2S heater circuit has malfunction….

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Mazda DTC C1446 Diagnostic

DTC C1446 Brake switch DETECTION CONDITION • Brake switch ON signal is input for 6 min or more when driving at a vehicle speed of 20 km/h {12.4 mph} or more. • Brake switch ON signal is not input even though the DSC HU/CM determines vehicle deceleration. POSSIBLE CAUSE • Open or short circuit in the wiring harness between brake switch…

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Mazda DTC P2097 Diagnostic

DTC P2097     Target A/F feedback system too rich   DETECTION CONDITION • The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is less than the specification, the PCM determines that the target A/F feedback system is too rich. Diagnostic support note • This is a…

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Mazda DTC P0602 Diagnostic

DTC P0602     PCM programming error   DETECTION CONDITION • No configuration data in the PCM Note • If “PCM CONFIGURATION” is successful, the PCM stored DTC P0602 and illuminates the MIL (System is normal). Clear the DTC P0602 using the WDS or equivalent after “PCM CONFIGURATION”. • The MIL goes out after three drive cycles with…

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Mazda DTC P0758 Diagnostic

DTC P0758     Shift solenoid B malfunction (electrical)   DETECTION CONDITION • If the PCM detects either of the following conditions, the PCM determines that shift solenoid B circuit has a malfunction. – Shift solenoid B voltage stuck at B+ after engine start – Shift solenoid B voltage stuck at 0 V after engine start Diagnostic support note: • This…

Mazda DTC P0734 Diagnostic

DTC P0734     Gear 4 incorrect (incorrect gear ratio detected)   DETECTION CONDITION • The PCM monitors revolution ratio of the forward clutch drum revolution to the differential gear case revolution when the following monitoring conditions are met. If the revolution ratio is below 0.6 or 1.25 or more, the PCM determines that there is a…

Mazda DTC P0121 Diagnostic

DTC P0121     TP sensor stuck closed   DETECTION CONDITION • If the PCM detects that the throttle valve opening angle is below 12.5% for 5 s after following conditions are met, the PCM determines that the TP is stuck closed: MONITORING CONDITION – Engine coolant temperature is above 70 °C {158 °F}. – MAF sensor signal is above 32.0 g/s {4.2 lb/min.}….

Mazda DTC P0610 Diagnostic

DTC P0610     PCM vehicle options error   DETECTION CONDITION • PCM data configuration error. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA…

Mazda DTC P0328 Diagnostic

DTC P0328   KS circuit high input   DETECTION CONDITION • The PCM monitors the input signal from the KS when the engine is running. If the input voltage at PCM terminals between 2Q and 2R is above 4.9 V, the PCM determines that KS circuit has a malfunction. Diagnostic support note • This is a continuous monitor…

Mazda DTC P0850 Diagnostic

DTC P0850     Neutral switch input circuit problem   DETECTION CONDITION • The PCM monitors changes in input voltage from the neutral switch. If the PCM does not detect PCM terminal 1S voltage changes while running vehicle with vehicle speed above 30 km/h {19 mph} and clutch pedal turns press and depress 10 times repeatedly, the PCM determines that…