Power Circuits
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- Check for battery voltage between PCM power terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION . See Fig 1. If battery voltage does not exist, check appropriate PCM f use in underhood fuse box. See PCM POWER CIRCUIT FUSE IDENTIFICATION . If fuse is okay, check for an open in wire between underhood fuse box and appropriate PCM power circuit terminal. See WIRING DIAGRAMS .
- Turn ignition on. Check for battery voltage between appropriate PCM power circuit terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION . If battery voltage does not exist, check appropriate fuse in underhood fuse box. See PCM POWER CIRCUIT FUSE IDENTIFICATION . If fuse is okay, check for open in wire between fuse box and appropriate PCM power circuit terminal, and check for defective ignition switch. See WIRING DIAGRAMS .POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION
Application (1) PCM Terminal Ground Circuits A12, A24, A25 & B9 Power Circuits Ignition Switch In OFF Position (2) D1 Ignition Switch In ON Position A13 & B1 (1) Use illustration for terminal location. See Fig 1 or Figure . (2) Back-up power supply. PCM POWER CIRCUIT FUSE IDENTIFICATIONApplication Fuse Ignition Switch In OFF Position BACK-UP Ignition Switch In ON Position ECU (ECM/PCM)