Malfunction Criteria

Fuel Trim Limits Exceeded (P0171, P0172)

A

Rich Limit Average > 1.0601 multiplier

Lean Limit Average < 0.94 multiplier

B

Rich Limit Average > 0.8 multiplier

Lean Limit Average < 1.25 multiplier

Fuel Trim Idle Condition Option Limits Exceeded (P2187, P2188)

A

Rich Limit Average > 1.5 multiplier

Lean Limit Average < 0.8 multiplier

B

Rich Limit Average > 0.78 multiplier

Lean Limit Average < 1.27 multiplier