Component Inspection

Visual Inspection.
1. Check the MAF for contamination, deterioration, or damage.
2. Is the MAF contaminated, deteriorated or damaged?
  YES
  - Repair or replace as necessary and Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to " 2 Check MAF" as below.
Check MAF.
1. Ignition "ON" & Engine "ON".
2. Install Scantool and select the "MAF SENSOR" parameter on the CURRENT DATA.
3. Monitor signal waveform of the "MAF SENSOR" on the Scantool.
  Specification: MAF value is increased correspondingly with TPS when pressing accelerator pedal.
  
  Fig 1: Screen Display - MAF Sensor Signal Waveform
4. Is the measured signal waveform of MAF sensor displaying correctly?
  YES
  - Go to " 3 Check PCM" as below.
  NO
  - Substitute with a known - good MAF and check for proper operation.
    If the problem is corrected, replace MAF and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check PCM.
1. Ignition "OFF".
2. Connect Scantool and Ignition "ON".
3. Select simulation function on scantool.
4. Simulate voltage at terminal 1 of MAF sensor signal connector.
  
  Fig 2: Screen Display - MAFS Voltage Simulation
5. Does the signal value of MAF sensor changes according to simulation voltage?
  YES
  - Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known - good PCM and check for proper operation.
    If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.