Turbo Meter Drive Circuit (Supra)
Remove turbo pressure sensor connector. Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Inspect wire harness connectors for damage or poor connection. Using a DVOM, check wiring harness connector terminals for correct values. See Fig 1. If values are not as specified, replace rheostat. See TURBO METER DRIVE CIRCUIT SPECIFICATIONS (SUPRA) table.
TURBO METER DRIVE CIRCUIT SPECIFICATIONS (SUPRA)
| Test Terminal | Ignition | Specified Value | |
|---|---|---|---|
| Resistance Check | |||
| A-8 - Ground | Off | Continuity | |
| E-1 - Ground | Off | Continuity | |
| E-2 - Ground | Off | Continuity | |
| E-3 - Ground | Off | Continuity | |
| Voltage Check | |||
| C-8 - Ground | Off | Zero Volts | |
| C-8 - Ground | On | Battery Voltage | |