DTC 73-1

DTC 73-1: MAP (Manifold Absolute Pressure) Sensor, or PCM
1. Clear the DTCs.
2. Test-drive the vehicle, and watch the VTM-4 indicator.
Does the VTM-4 indicator come on?
YES - Go to step 3.
NO - The system is OK at this time.
3. Watch the MIL.
Does the MIL come on?
YES - Check the Fuel and Emissions system for DTCs.
NO - Check for loose terminal fit in the VTM-4 control unit and the PCM connectors. If it is normal, replace the VTM-4 control unit.