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Home >> Toyota >> 1994 >> Camry XLE, 2.2 S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4-CYL >> Trouble Code Charts >> ECM Back-Up Power Source Circuit Check

ECM Back-Up Power Source Circuit Check

Battery positive voltage is supplied to BATT terminal of ECM even when ignition switch is turned off for use by the diagnostic trouble code memory, air/fuel ratio adaptive control value memory, etc.

Fig 1: ECM Back-Up Power Source Circuit Check - Schematic
G94G44681Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: ECM Back-Up Power Source Circuit Check - Diagnostic Flowchart
G94B44686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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