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

1. Turn ignition switch Off, then connect a vacuum gauge inline with map sensor vacuum hose.
2. Start engine and observe vacuum gauge with engine idling, then observe gauge while snapping throttle open and close.
3. If vacuum gauge reads manifold vacuum with engine idling or vacuum gauge reading drops to zero when throttle is snapped open and closed, proceed to Test 2 step B.
4. If vacuum gauge reads zero at idle, repair vacuum line to throttle body.
5. If vacuum gauge reading slowly drops to zero when throttle is snapped open and closed, repair restriction in vacuum supply line to MAP sensor.