Test DF: Step 1

1) Code 22: Check For Power to MAP/BP Sensor  Code 22 indicates that the MAP/BP sensor is out of Self-Test voltage range (1.4-1.6 volts). Possible causes of this code are:

• MAP/BP signal circuit open between sensor and ECA
• MAP/BP signal circuit shorted to VREF, SIG RTN or ground
• Faulty MAP/BP sensor
• Vacuum trapped at MAP/BP sensor
• High atmospheric pressure
• Faulty ECA
• VREF circuit open at sensor
• SIG RTN open at sensor

Turn key off. Disconnect MAP/BP sensor from vehicle harness. Connect MAP/BP tester between wiring harness and MAP/BP sensor. Connect "banana plugs" of tester into DVOM and set DVOM on 20-volt scale.

Turn key on. If Red light, or no light is on, it indicates VREF is either to high or too low. Go to next step. If Green light is on, it indicates VREF is okay. Go to step 3).