Signal Circuit Inspection

Check voltage
1. IG "OFF" and disconnect MAFS connector.
2. IG "ON' & ENG "OFF".
3. Measure voltage between terminal 1 of MAFS harness connector and chassis ground.
  Specification: Approx. 5V
4. Is the measured voltage within specification ?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - If the measured voltage is "0", go to step 4. If the measured voltage is over "5V", go to step 2.
Check short to battery in harness
1. IG "OFF" and disconnect MAFS and PCM connector.
2. Measure resistance between terminal 1 and 2 of MAFS harness connector.
3. Measure resistance between terminal 1 and 4 of MAFS harness connector.
  Specification: Infinite
4. Is the measured resistance within specification ?
  YES
  - Go to step 3.
  NO
  - Repair short to battery in harness and go to " VERIFICATION OF VEHICLE REPAIR " procedure.
Check short to ground in harness
1. IG "OFF" and disconnect MAFS and PCM connector.
2. Measure resistance between terminal 1 of MAFS harness connector and chassis ground.
  Specification: Infinite
3. Is the measured resistance within specification ?
  YES
  - Go to step 4.
  NO
  - Repair short to ground in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check open in harness
1. IG "OFF" and disconnect MAFS and PCM connector.
2. Measure resistance between terminal 1 of MAFS harness connector and terminal 47 of PCM harness connector.
  Specification: Approx. below 1Ω.
3. Is the measured resistance within specification ?
  YES
  - Go to "GROUND CIRCUIT INSPECTION " procedure.
  NO
  - Repair open in harness and go to "VERIFICATION OF VEHICLE REPAIR " procedure.