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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
G91D17528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Diagnostic Circuit Check Flow Chart
G91C17527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002