1997 Honda Prelude Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Power Circuits

  1. Check for battery voltage between appropriate PCM connector Voltage Back-Up (VBU) terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION . See Fig 1. If battery voltage does not exist, check appropriate PCM fuse. See PCM POWER CIRCUIT FUSE IDENTIFICATION . If fuse is okay, check for an open in wire between fuse and appropriate PCM connector terminal. See WIRING DIAGRAMS article.
  2. Turn ignition on. Check for battery voltage between appropriate PCM connector Ignition Power (IGP) source terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION . If battery voltage does not exist, check appropriate fuse. See PCM POWER CIRCUIT FUSE IDENTIFICATION . If fuse is okay, check for open in wire between fuse and appropriate PCM connector terminal. Check for defective ignition switch. See WIRING DIAGRAMS article.
POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION

Application (1) PCM Terminal
Ground Circuits
Logic Ground (LG1 & LG2) A9, A22, D11 & D12
Power Ground (PG1 & PG2) A10, A23, D11 & D12
Power Circuits
Ignition Switch In OFF Position (VBU) (2) C10
Ignition Switch In ON Position (IGP1 & IGP2) (3) A11 & A24
(1) Use illustration for terminal location. See Fig 1.
(2) Voltage Back-up (VBU) power supply, battery voltage at all times.
(3) Battery voltage with ignition on and zero volt with ignition off.
PCM POWER CIRCUIT FUSE IDENTIFICATION

Application Fuse
Ignition In OFF Position (1) No. 43 CLOCK RADIO (7.5-amps)
Ignition In ON Position (2) No. 4 ACG-S (15-amps)
(1) Located in underhood fuse/relay box.
(2) Located in underdash fuse/relay box.
Fig 1: PCM Harness Connector Terminal Identification
G96D09587Courtesy of AMERICAN HONDA MOTOR CO., INC.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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