CMPS visual check
Key "OFF".
Check physical condition of CMPS.
Check the projection of cam-shaft visually after remove the CMPS.
Is everything O.K ?
YES
Go to "CMPS check" procedure.
NO
Repair as necessary and then, go to "Verification of Vehicle Repair" procedure.
CMPS check
Key "ON". (Don’t disconnect sensors.)
Select "vehicle scopemeter" in the menu, and connect channel A of scantool with terminal 2 of CMPS harness connector.
Engine start. And check the signal waveforms.
Specification :
Is the signal waveform within specifications?
YES
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. So, check poor connections and the related circuit between ECM and component thoroughly. Repair as necessary 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 then go to "Verification of Vehicle Repair" procedure.
