< Timer diagnosis >

Start the count up operation of counters in ECM and in soaking timer IC when the engine is started.

Judge as timer malfunction if the difference between the counter in ECM and counter in soaking timer IC exceeds the allowable limit when the ignition switch is OFF.

Fig 1: Ignition Switch, Main Relay, Driving Cycle, ECM Counter And Soak Timer IC Counter Timing Pattern (Timer Diagnosis)

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• Abnormality Judgment 

Judge as NG when the following conditions are established.

• Normality Judgment 

Judge as OK when the following conditions are established.