CHECK START SWITCH SIGNAL.

1) Connect the connector to ECM and power supply CM.

2) Read the waveform of start switch signal using an oscilloscope.

3) Press the push button ignition switch once with the clutch pedal depressed.

Connector & terminal

(B134) No. 27 (+) — Chassis ground (−):

QUESTION

Does waveforms of the start switch signal occur?

Yes No

Repair the poor contact of ECM connector.

Repair the poor contact of power supply CM connector.