Diagnostic Circuit Check

CAUTION: Perform all voltage measurements with ECU harness connector installed. Use a high-impedance DVOM (10,000-ohm minimum). Verify battery voltage is greater than 11 volts.

Fig 1: Diagnostic Circuit Check Schematic (5S-FE 4-Cylinder)

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Fig 2: Diagnostic Circuit Check Flow Chart

Fig 3: Diagnostic Circuit Check Schematic (3VZ-FE V6)