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P0171, P0172, P1171, P1172

Read the instructions below then start the fault diagnostic procedure.

Symptom: The CHECK ENGINE lamp (MIL) comes on

P0171, P0172, P1171, P1172


Fuel Trim. Max Value, Air/Fuel too Lean.

Fuel Trim. Min Value, Air/Fuel too Rich.

Variable Intake Manifold Outer Flap Valve Circuit. Short to Ground.

Variable Intake Manifold Outer Flap Valve Circuit. Short to B+.


Fault symptoms

The CHECK ENGINE lamp (MIL) comes on

Conditions

P0171,P0172:

More than 25% enrichment or more than 25% leaner for at least 60 seconds.

P1171, P1172:

The air flow through the IAC-valve when idling is too small or too big in relation to the expected value