P0100 - Mass Air Flow Circuit Malfunction

The Mass Air Flow (MAF) sensor circuit is monitored by the Powertrain Control Module (PCM). The test fails when the signal received by the PCM is an excessively high voltage during key ON and engine OFF, high voltage during light load driving conditions, excessively low voltage during key ON engine running, or low voltage during heavy load driving conditions. When DTC P0100 is detected the PCM enters fail safe mode, the MIL illuminates, and the engine speed will not rise more than 2,400 rpm due to the fuel cut.

Possible Causes:
^ MAF circuit open
^ MAF circuit short to VPWR
^ MAF circuit short to GND
^ MAF RTN circuit open
^ MAF RTN circuit short to VPWR
^ MAF RTN circuit short to GND
^ Damaged MAF sensor
^ Intake air leaks
^ PWR GND circuit open
^ VPWR circuit open
^ VPWR circuit short to GND

Diagnostic Aids:
MAF PID reading with the engine running at idle should be 1.0 - 1.7 volts. The MAF PID reading with the engine running at 2,500 rpm should be 1.7 - 2.3 volts.