Component Inspection: Notes

■ ECM check 

1. IG "OFF".
2. Select "Vehicle Scope meter" in the menu, and connect channel A of GDS with FR terminal of Alternator harness connector.
3. Connect Channel B of GDS with C terminal of Alternator harness connector.
4. Engine start. And check the signal waveforms. (Compare the signal waveform of electrical loads ON with OFF)

   Specification :  Refer to SIGNAL WAVEFORM & DATA 

5. Is the measured signal waveforms of Alternator normal?

   YES 

   • Go to ALTERNATOR CHECK  procedure.

   NO 

   • 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.