Geely CK Series 2007 Workshop Manual page 189

(b) Inspect the engine ECU revolution output signal
1
Remove the engine ECU and retain the connection of connectors.
2
Connect the oscilloscope to the terminal 54 and ground.
3
Start the engine
4
Inspect the signal wave form
Standard:
Show the correct wave form
Result and solution:
Normal Repair or replace the harness or
connector
Abnormal Inspect the engine control system
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