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Power Circuits

  1. Check for battery voltage between appropriate PCM connector Voltage Back-Up (VBU) terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION  table. If battery voltage does not exist, check appropriate PCM fuse. See PCM POWER CIRCUIT FUSE IDENTIFICATION  table. 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  table. If battery voltage does not exist, check appropriate fuse. See PCM POWER CIRCUIT FUSE IDENTIFICATION  table. 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
Accord, Civic (Except D16Y5 Engine With M/T), CR-V, Odyssey & S2000
Logic Ground (LG1 & LG2) B20 & B22
Power Ground (PG1 & PG2) B2 & B10
Sensor Ground (SG1 & SG2) C7 & C18
Civic D16Y5 Engine With M/T & Prelude
Logic Ground (LG1 & LG2) A9 & A22
Power Ground (PG1 & PG2) A10 & A23
Sensor Ground (SG1 & SG2) D12 & D11
Power Circuits
Accord, Civic (Except D16Y5 Engine With M/T), CR-V, Odyssey & S2000
Ignition Switch In OFF Position (VBU)(2) B21
Ignition Switch In ON Position (IGP1 & IGP2)(2) B1 & B9
Sensor Voltage (VCC1 & VCC2) C19 & C28
Civic D16Y5 Engine With M/T & Prelude
Ignition Switch In OFF Position (VBU)(2) C10
Ignition Switch In ON Position (IGP1 & IGP2)(2) A11 & A24
Sensor Voltage (VCC1 & VCC2) D4 & D10
(1) Use illustration for terminal location. See PIN VOLTAGE CHARTS article. Voltage Back-Up (VBU) power supply, battery voltage at all times.
(2) Battery voltage with ignition on and zero volt with ignition off.
PCM POWER CIRCUIT FUSE IDENTIFICATION

Ignition Position/Circuit Fuse
ON/IGP1 & IGP2
Accord (2), Odyssey (2) & S2000 (4) No. 46 - ACG-S (15-Amp)
Civic (2) & CR-V (2) No. 44 - FI E/M (15-Amp)
Prelude (3) No. 4 - ACG-S (10-Amp)
OFF/VBU
Accord (1) & Odyssey (1) No. 13 - CLOCK/BACK-UP (7.5-Amp)
Civic(2) & CR-V (2) No. 47 - BACK-UP (7.5-Amp)
Prelude (2) No. 43 - CLOCK/RADIO (7.5-Amp)
S2000 (3) No. 25 - BACK-UP (7.5-Amp)
(1) Located in passenger's underdash fuse/relay box.
(2) Located in underhood fuse/relay box.
(3) Located in underdash fuse/relay box.
(4) Located in main underhood fuse/relay box.
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