DF1

NOTE: Special Tool Required. MAP/BP Sensor Tester 105-00001. This tool converts the frequency output of the MAP/BP sensor to analog DC signal, and verifies the sensor reference voltage is within normal parameters.

Diagnostic Trouble Code (DTC) 126 indicates the Manifold Absolute Pressure (MAP)/Barometric Pressure (BARO) sensor is out of Self-Test range. Correct MAP/BARO range of measurement is typically from 1.4 to 1.6 volts.

Possible causes:

- MAP/BARO circuit open between sensor vehicle harness connector and PCM.

- MAP/BARO circuit shorted to VREF, SIG RTN, or GND.

- Damaged MAP/BARO sensor.

- Vacuum trapped at MAP/BARO sensor.

- High atmospheric pressure.

- Damaged Powertrain Control Module (PCM).

- VREF circuit open at MAP/BARO sensor.

- SIG RTN circuit open at MAP/BARO sensor.

- Key "OFF".

- Disconnect the MAP/BARO sensor from the vehicle harness.

- Connect the MAP/BARO tester between the vehicle harness connector and the MAP/BARO sensor.

- Insert MAP/BARO tester banana plugs into DVOM.

NOTE: Green light on tester indicates VREF is OK (4-6 volts). Red light (or no light) indicates VREF is either too low or too high.

- Key "ON".

- Is green light on?

Yes -- Go to DF3. DF3

No -- Go to DF2. DF2