Absolute Pressure Sensor: Testing and Inspection

TMap / MAP / Intake Air Temp. Sensor Testing

The EMS2000 compares the voltage outputs from the MAP sensor (ahead of the supercharger) to the outputs received from the TMAP (subject to increased pressures from the supercharger) and calculates air volume drawn into the engine.
- Voltage Reading of 0.6-1.5 volts indicates high vacuum condition (Idle or no load)
- Voltage Reading of 4 volts indicates low vacuum condition (Full Throttle)

TMap and MAP Sensors Failure Symptoms
- Engine difficult to start, stalls at idle and misfires.

TMap and MAP Sensor Testing
- Ensure that voltage changes and does not remain constant at 0 or 5 volts.
- Install BOB on EMS2000 check voltage at appropriate pins
- Check sensor for internal shorts

Intake Air Temp Sensor Failure Symptoms
- Problems with cold starting, poor driveability and an increase in emissions.
- Possible lack of power, particularly noticeable in hot ambient temperatures.

With other possible failure modes the EMS2000 should ensure that the engine will limp home on a default value.

Intake Air Temp Sensor Testing
- Ensure that voltage changes and does not remain constant at 0 or 5 volts.
- Check Sensor Resistance

NOTE: On the COOPER S only the downstream TMAP has an intake air temperature sensor built into it.