- Using a multimeter, check for voltage by backprobing the MAP sensor connector.
- With the key ON, and the engine OFF, verify that
there is at least 4.8 volts between the SIG and GND terminals of the MAP sensor
connector. If voltage is not within specification, check power and ground
circuits and repair as necessary.
- With the key ON, and the engine ON, check the voltage
between GND and SIG RTN terminals. Voltage should be approximately between
0.8 and 2.4 volts. If voltage is not within specification, the sensor may
be faulty.
- If the voltage check in step 3 was OK, then check the voltage
between GND and SIG RTN terminals and suddenly depress the accelerator, the
voltage should rise and stay at 2.4 volts. If the voltage does not stay at
2.4 volts, replace the MAP sensor.
