2A Fault Codes 13 &/or 14 MAP Sensor Circuit

*** UPDATED BY TSB #18-61-86

1. Turn ignition Off, then tee a vacuum gauge into MAP sensor vacuum line.
2. Start engine, then observe vacuum gauge at idle and while snapping throttle open and closed.
3. If vacuum gauge is reading manifold vacuum at idle and immediately drops to zero when throttle is snapped open and closed, proceed to step B. 2B MAP Sensor In Logic Module
4. If vacuum gauge indicates zero vacuum at idle, repair vacuum line to throttle body.
5. If vacuum gauge slowly drops to zero when throttle is snapped open and closed, repair restriction in vacuum supply line to MAP sensor.