Power Circuits
- Using a voltmeter, check for battery voltage between ECU power terminal and ground. See POWER & GROUND TERMINAL IDENTIFICATION table. See Figure and Figure . If battery voltage is not present, check appropriate ECU fuse in underhood fuse box. See ECU POWER CIRCUITS FUSE IDENTIFICATION table. If fuse is okay, check for an open in wire between underhood fuse box and appropriate ECU power circuit terminal.
- Turn ignition switch to ON position. Using a voltmeter, check for battery voltage between appropriate ECU power circuit terminal and ground. See POWER & GROUND TERMINAL IDENTIFICATION
table. See Figure
and Figure
. If battery voltage is not present, check appropriate fuse in underhood fuse box. See ECU POWER CIRCUITS FUSE IDENTIFICATION
table. If fuse is okay, check for an open in wire between fuse box and appropriate ECU power circuit terminal, or check for a defective ignition switch.POWER & GROUND TERMINAL IDENTIFICATION
Application (1) ECU Terminal Accord Ground Circuits A23, A24, A26 & B2 Power Circuits Ignition Switch In OFF Position D1 Ignition Switch In ON Position A25 & B1 Civic & CRX Ground Circuits A2, A4, A16 & A18 Power Circuits Ignition Switch In OFF Position B1 Ignition Switch In ON Position A13 & A15 Prelude 2.0L Ground Circuits A2, A4, A16 & A18 Power Circuits Ignition Switch In OFF Position A17 Ignition Switch In ON Position A13 & A15 2.1L Ground Circuits A23, A24, A26 & B2 Power Circuits Ignition Switch In OFF Position D1 Ignition Switch In ON Position A25 & B1 (1) See Figure and Figure for terminal location identification. ECU POWER CIRCUITS FUSE IDENTIFICATIONApplication (1) Fuse Accord Ignition Switch In OFF Position Back-Up Ignition Switch In ON Position ECU Civic & CRX Ignition Switch In OFF Position Hazard Ignition Switch In ON Position ECU Prelude Ignition Switch In OFF Position Clock Ignition Switch In ON Position EFI/ECU (1) All fuses in underhood fuse box.