Inspection of ECM and Its Circuits - Part 2
Inspection of ECM and Its Circuits - Part 2
17. Reference waveform No. 17
EVAP canister purge valve signal
18. Reference waveform No. 18
No.2 Fuel injector signal (2) at engine idling
19. Reference waveform No. 19
CMP sensor signal at engine idling
20. Reference waveform No. 20
CMP sensor signal at engine idling
21. Reference waveform No. 21
EGR valve No.3 coil (1) and No.4 coil (2) signal
22. Reference waveform No. 22
Heated oxygen sensor heater signal
23. Reference waveform No. 23
No.1 Fuel injector signal (2) at engine idling
24. Reference waveform No. 24
ISC valve signal at engine idling
25. Reference waveform No. 25
No.3 ignition coil signal (2) at engine idling
26. Reference waveform No. 26
Ignition coil signal (2) at engine idling
27. Reference waveform No. 27
CKP sensor signal (2) at engine idling
28. Reference waveform No. 28
CKP sensor (1) signal at engine idling
29. Reference waveform No. 29
Knock sensor signal at engine speed 4000 rpm
30. Reference waveform No. 30
Knock sensor signal at engine speed 4000 rpm
31. Reference waveform No. 31
No.4 ignition coil signal (2) at engine idling
32. Reference waveform No. 32
No.1 ignition coil signal (2) at engine idling
33. Reference waveform No. 33
No.2 ignition coil signal (2) at engine idling
Resistance Check
1) Disconnect ECM couplers (1) from ECM with ignition switch OFF.
CAUTION:
Never touch terminals of ECM itself or connect voltmeter or ohmmeter (2).
2) Check resistance between each pair of terminals of disconnected couplers as listed in the following table.
CAUTION:
- Be sure to connect ohmmeter probe from wire harness side of coupler.
- Be sure to turn OFF ignition switch for this check.
- Resistance in the following table represents that when parts temperature is 20 °C (68 °F).
