Diagnostic Aids

If problem can not be isolated using diagnostic charts, monitor LT fuel trim and fuel trim cell while operating vehicle under various loads. This may isolate condition which caused Code P0172 to set.

Fig 1: Code P0172 Schematic (3.8L) Fuel Trim Rich

Fig 2: Code P0172 Flow Chart (3.8L 1 Of 2) Fuel Trim Rich

Fig 3: Code P0172 Flow Chart (1 of 2)

Fig 4: Code P0172 Flow Chart (3.8L - 2 Of 2) Fuel Trim Rich

Fig 5: Code P0172 Flow Chart (2 of 2)