1998 Isuzu Oasis LSFACTORY 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 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.
  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
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) (2) B21
Ignition Switch In ON Position (IGP1 & IGP2) (3) B1 & B9
Sensor Voltage (VCC1 & VCC2) C19 & C28
Civic & Prelude
Ignition Switch In OFF Position (VBU) (2) C10
Ignition Switch In ON Position (IGP1 & IGP2) (3) A11 & A24
Sensor Voltage (VCC1 & VCC2) D4 & D10
(1) Use illustration for terminal location. See Figure .
(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

Ignition Position Fuse
Accord
OFF Position (VBU) (2) No. 13 - CLOCK/BACK-UP (7.5-amp)
ON Position (IGP1 & IGP2) (1) No. 6 - ACG (15-amp)
Civic
OFF Position (VBU) (1) No. 12 - BACK-UP/RADIO (7.5-amp)
ON Position (IGP1 & IGP2) (1) No. 11 - FI E/M (10-amp)
CR-V
OFF Position (VBU) (1) No. 14 - BACK-UP/RADIO (7.5-amp)
ON Position (IGP1 & IGP2) (1) No. 13 - FI E/M (15-amp)
Oasis & Odyssey
OFF Position (VBU) (1) No. 10 - BACK-UP (7.5-amp)
ON Position (IGP1 & IGP2) (1) No. 13 - ECU (PCM) (15-amp)
Prelude
OFF Position (VBU) (1) No. 13 - CLOCK/RADIO (7.5-amp)
ON Position (IGP1 & IGP2) (3) No. 4 - ACG (10-amp)
(1) Located in under-hood fuse/relay box.
(2) Located in passengers under-dash fuse/relay box.
(3) Located in drivers under-dash fuse/relay box.
Factory Service Tools

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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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