Component Inspection

Component Inspection

1. Check CMPS
(1) IG "OFF" and connect scantool.
(2) ENG "ON" and Measure signal waveform at terminal 3 of CMPS.
A. Reference signal waveform :




(3) Is the measured signal waveform normal?
YES
- Substitute with a known-good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.
NO
- Substitute with a known-good CMPS and check for proper operation. If the problem is corrected, replace CMPS and go to "Verification of Vehicle Repair" procedure.

CAUTION:
There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM. After testing ECM on the vehicle, use this function to reuse the ECM on the others