Power Circuits
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Isuzu Oasis, 1998 Isuzu Oasis, 1998 Honda Prelude, 1998 Honda Odyssey, and 1998 Honda Civic. However, it is still accessible from the selected car via links, so may be relevant.
- Check for battery voltage between appropriate PCM connector Voltage Back-Up (VBU) terminal and ground. See POWER & GROUND CIRCUIT TERMINAL IDENTIFICATION
. See Figure
. 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.
- 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 |
PCM Terminal |
| Ground Circuits |
| Accord, CR-V, Oasis & Odyssey |
| Logic Ground (LG1 & LG2) |
B20 & B22 |
| Power Ground (PG1 & PG2) |
B2 & B10 |
| Sensor Ground (SG1 & SG2) |
C7 & C18 |
| Civic & Prelude |
| Logic Ground (LG1 & LG2) |
A9 & A22 |
| Power Ground (PG1 & PG2) |
A10 & A23 |
| Sensor Ground (SG1 & SG2) |
D11 & D12 |
| Power Circuits |
| Accord, CR-V & Oasis & Odyssey |
| Ignition Switch In OFF Position (VBU) |
B21 |
| Ignition Switch In ON Position (IGP1 & IGP2) |
B1 & B9 |
| Sensor Voltage (VCC1 & VCC2) |
C19 & C28 |
| Civic & Prelude |
| Ignition Switch In OFF Position (VBU) |
C10 |
| Ignition Switch In ON Position (IGP1 & IGP2) |
A11 & A24 |
| Sensor Voltage (VCC1 & VCC2) |
D4 & D10 |
PCM POWER CIRCUIT FUSE IDENTIFICATION
| Ignition Position |
Fuse |
| Accord |
| OFF Position (VBU) |
No. 13 - CLOCK/BACK-UP (7.5-amp) |
| ON Position (IGP1 & IGP2) |
No. 6 - ACG (15-amp) |
| Civic |
| OFF Position (VBU) |
No. 12 - BACK-UP/RADIO (7.5-amp) |
| ON Position (IGP1 & IGP2) |
No. 11 - FI E/M (10-amp) |
| CR-V |
| OFF Position (VBU) |
No. 14 - BACK-UP/RADIO (7.5-amp) |
| ON Position (IGP1 & IGP2) |
No. 13 - FI E/M (15-amp) |
| Oasis & Odyssey |
| OFF Position (VBU) |
No. 10 - BACK-UP (7.5-amp) |
| ON Position (IGP1 & IGP2) |
No. 13 - ECU (PCM) (15-amp) |
| Prelude |
| OFF Position (VBU) |
No. 13 - CLOCK/RADIO (7.5-amp) |
| ON Position (IGP1 & IGP2) |
No. 4 - ACG (10-amp) |