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 " 4Check open in harness" as follows. If the measured voltage is over "5V", go to " 2Check short to battery in harness" as follows.
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 " 3Check short to ground in harness" as follows.
  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 " 3Check open in harness" as follows.
  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 1 Ω.
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.