Details On DTCs
WARNING: This page is about a different variant/trim than selected.
DTC P0171-00: (PCM, VIN Y) DETECTION CONDITION AND POSSIBLE CAUSE
| DESCRIPTION |
Fuel trim system too lean |
| DETECTION CONDITION |
Determination conditions |
- Any one of the following conditions is met:
- The sum of the fuel feedback correction amount (SHRTFT1) and the fuel learning correction amount (LONGFT1) is the specified value (30%) or more, and 10 s or more have elapsed with the fuel learning correction amount (LONGFT1) at the specified value (15%) or more.
- While the engine is idling or the vehicle is driven, the fuel feedback correction amount reaches the upper limit (25% or more) for 20 s or more.
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| Preconditions |
- Engine coolant temperature: 0-45 °C {32-113 °F}, 60 °C {140 °F} or more
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| Malfunction determination period |
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| Drive cycle |
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| Self test type |
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| Sensor used |
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| FAIL-SAFE FUNCTION |
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| VEHICLE STATUS WHEN DTCs ARE OUTPUT |
- Illuminates check engine light.
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| POSSIBLE CAUSE |
- ECT sensor signal malfunction
- MAF sensor signal malfunction
- MAP sensor signal malfunction
- IAT sensor No. 2 signal malfunction
- Related connector or terminals malfunction
- Related wiring harness malfunction
- High-pressure side fuel delivery system malfunction
- High fuel pressure sensor malfunction
- Relief valve (built-into high pressure fuel pump) malfunction
- Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)
- Spill valve control solenoid valve (built-into high pressure fuel pump) malfunction
- High pressure fuel pump malfunction
- Fuel leakage in fuel line
- Low-pressure side fuel delivery system malfunction
- Fuel filter clogged (built-into fuel pump unit)
- Low pressure side fuel line restriction (between fuel pump unit and high pressure fuel pump)
- Fuel pump unit malfunction
- Pressure regulator (built-into fuel pump unit) malfunction
- Fuel pump control module malfunction
- Fuel injector malfunction
- Improper operation of fuel injector
- Fuel injector related wiring harness malfunction
- Improper operation of purge control system
- Purge solenoid valve malfunction
- Purge solenoid hoses improper connection
- PCV valve malfunction
- MAF sensor malfunction
- Air cleaner element malfunction
- MAP sensor malfunction
- Air suction in intake air system
- Improper operation of electric variable valve timing control system
- Electric variable valve timing driver malfunction
- Electric variable valve timing motor malfunction
- Electric variable valve timing actuator malfunction
- Improper operation of hydraulic variable valve timing control system
- A/F sensor malfunction
- Poor fuel quality
- PCM malfunction
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