DC1 - KOEO DTC 1101 And KOER DTC 1101: Check MAF Sensor Output

Key On Engine Off (KOEO) DTC 1101 indicates the Mass Air Flow (MAF) signal was greater than 0.20 volts during KOEO Self-Test.

Key On Engine Running (KOER) DTC 1101 indicates the MAF signal was not between 2.50 and 25.72 gm/sec. (0.34 and 1.96 volts) during KOER Self-Test.

NOTE: DTC 1101 could be generated by a low charged vehicle battery or the garage exhaust ventilation system. Service the battery as necessary. Then remove ventilation system and properly vent to outside atmosphere. Rerun KOEO Self-Test. Diagnostic Subroutines (DSR) - Extracting Codes

Possible Causes:
- Damaged MAF sensor.
- Contaminated MAF sensor.
- MAF sensor partially connected.
- Open PWR GND harness circuit.
- Open MAF RTN harness circuit.
- Damaged PCM.

- Key Off.

- Disconnect PCM. Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Scan Tool connected.

- Install breakout box, connect PCM to breakout box.

- Key On, Engine Off.

- Measure between Test Pin 88 (MAF SIG) and Test Pins 24 or 103 (PWR GNP) at the breakout box.

- Is the voltage greater than 0.20 volts?

YES -- The MAF SIG voltage is greater than expected. Go to DC12. DC12 - Check PWR GND Circuit Continuity

NO -- Go to DC9. DC9 - Check MAF Circuit For Short to GND and MAF RTN Circuit