SFI SYSTEM PROBLEM SYMPTOMS TABLE

Tech Tips

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace pats as necessary.

SFI system
Symptom Suspected Area See page
Engine does not crank (does not start) 1. Starter signal circuit

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2. Starter (for 1.0 kW Type)

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3. Starter (for 1.7 kW Type)

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4. ST relay

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No initial combustion (does not start) 1. ECM power source circuit

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2. VC output circuit

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3. Fuel pump control circuit

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4. ECM

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No complete combustion (does not start) 1. Fuel pump control circuit

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Engine cranks normally but difficult to start 1. Starter signal circuit

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2. Fuel pump control circuit

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3. Compression

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Difficult to start with cold engine 1. Starter signal circuit

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2. Fuel pump control circuit

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Difficult to start with hot engine 1. Starter signal circuit

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2. Fuel pump control circuit

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High engine idling speed (poor idling) 1. A/C signal circuit -
2. ECM power source circuit

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Low engine idling speed (poor idling) 1. A/C signal circuit -
2. Fuel pump control circuit

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Rough idling (poor idling) 1. Compression

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2. Fuel pump control circuit

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Hunting (poor idling) 1. ECM power source circuit

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2. Fuel pump control circuit

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Hesitation / Poor acceleration (poor driveability) 1. Fuel pump control circuit

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Surging (poor driveability) 1. Fuel pump control circuit

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2. Brake Override System

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Engine stalls soon after starting 1. Fuel pump control circuit

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2. ECM

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Engine stalls during A/C operation 1. A/C signal circuit (compressor circuit) -
2. ECM

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MIL is not illuminated 1. MIL circuit

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