DTC P1100: MAF sensor Supply Voltage High/Low Check the ''On Board Diagnostic (OBD) System Check''. Was the ''OBD System Check'' performed? YES – Go to step 2. NO – Go to OBD System Check. Check the DTC. Are there any other DTCs (beside DTC P0101) being output? YES – Go to relevant DTC chart. NO – Go to step 3. Check for the following conditions: Damaged MAF sensor (A) The duct work at the MAF sensor for leaks PCV system vacuum leaks Incorrect PCV valve Vacuum leaks in EGR valve flange and pipes Intake manifold vacuum leaks Is a problem found? YES – Repair as necessary. NO – Go to step 4. Start the engine and allow it to idle.

Check the MAF with the scan tool. Is about 8 – 13 g/sec indicated (Sea level of 0 m at indoor temperature)? YES – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the MAF sensor and at the ECM. NO – Go to step 6. Turn the ignition switch OFF. Disconnect the MAF sensor 5P connector. Disconnect ECM connector. Check the MAF sensor signal and +5 V circuits for an open or short to ground. Wire side of female terminals MAF/IAT sensor 5P connector JUMPER WIRE Is a problem found? YES – Repair the MAF signal or +5 V circuit. NO – Go to step 10. aaa