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Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damage of component.

Perform checking procedure as follows.

(1)

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

(2)

Check connecting condition of ECM and component connector : Check terminal separation, damage of locking device and connecting condition between terminal and wiring.

note

Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition. (After checking, reconnect the pin at correct position.)

Is the problem found?

	▶ Repair the trouble causing part and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Signal Circuit Inspection".

Monitor the signal waveform at IG key ON/OFF.

Reference signal waveform

Fig.1) The waveforms of "IG key ON" signal and main relay operation are measured simultaneously.

☞ Check poor connection at the point of IG key ON.

Is the signal waveform normal?

	▶ Go to "Verification of Vehicle Repair" procedure.
	▶ Repair open OR eliminate the causes of excessive resistance between 'ECU-3 FUSE 10A' terminal of 'E/R JUNCTION BOX' harness connector and 'ON/START input' terminal of ECM harness connector, and go to "Verification of Vehicle Repair".