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Home >> Volvo >> 1993 >> 940 Base, 4D Sedan, AW70L >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls - Tests W/Codes) >> Fault Code Testing >> Code 5-1-2 (Short Term Fuel Trim) >> Fault Condition

Fault Condition

WARNING: This page is about a different car, the 1994 Volvo 960. However, it is still accessible from the selected car via links, so may be relevant.

The ECM receives information from the HO2S on air/fuel mixture. If air/fuel mixture deviates from l=1, the short-term fuel trim compensates for it by adjusting the injection period. If the short-term fuel trim remains lean for more than 3 minutes and engine temperature exceeds 75°C (167°F), DTC 5-1-2 is set.

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