Signal Circuit Inspection

NOTE: This procedure is applied to vehicle with ABS (or ESC) in case of no ABS (or ESC), refer to "REAR WHEEL SPEED SENSOR ".

Check short to ground in harness
1. IG "OFF"
2. Disconnect PCM connector and ABS or ESC control module connector.
3. Measure resistance between terminal 52 of PCM harness connector and chassis ground.
  Specification: Infinite
4. Is the measured resistance within specifications?
  YES
  - Go to " 1Check open in harness" as follows.
  NO
  - Repair short to ground in harness, and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for open in harness
1. Ignition "OFF"
2. Disconnect PCM connector and ABS or ESC control module connector.
3. Measure resistance between terminal "52" of PCM harness connector and terminal "14 (With ESC: terminal 21)" of ABS control module harness connector.
  Specification: Approx. below 1Ω
  
  NOTE: This picture is only applied to vehicle with ABS
4. Is the measured resistance within specifications?
  YES
  - Go to " 3Check wheel speed sensor" procedure.
  NO
  - Check open in harness.
  - Repair or replace as necessary and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check wheel speed sensor
1. IG "OFF"
2. Check open or short in wheel speed sensor (Refer to "REAR WHEEL SPEED SENSOR ")
3. Is the wheel speed sensor normal?
  YES
  - Substitute with a known - good PCM/ ABS or ESC control unit and check for proper operation. If the problem is corrected, replace PCM/ ABS or ESC control unit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Repair or replace it as necessary.
  - And then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. After testing PCM on the vehicle, use this function to reuse the PCM on the others