Turbo Meter Drive Circuit (Supra)

Disconnect turbo pressure sensor connector. Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Inspect wire harness connectors/terminals for damage or poor connections.
Using DVOM, check wiring harness connector terminals for correct values. See Fig 1. See TURBO METER DRIVE CIRCUIT SPECIFICATIONS TABLE (SUPRA) . If values are not as specified, replace rheostat.

TURBO METER DRIVE CIRCUIT SPECIFICATIONS (SUPRA)

Connector-Terminal Number ⁽¹⁾

Specified Value

Resistance Check

"A"-8 - Ground

Continuity

"E"-1 - Ground ⁽²⁾

Continuity

"E"-2 - Ground ⁽³⁾

Continuity

"E"-3 - Ground ⁽³⁾

Continuity

Voltage Check

"C"-8 - Ground ⁽⁴⁾

Zero Volts

"C"-8 - Ground ⁽⁵⁾

Battery Voltage

⁽¹⁾	See Fig 1.

⁽²⁾	Ensure pressure sensor connector is disconnected.

⁽³⁾	Ensure all 3 pressure sensor harness connector terminals are grounded. See Figure.

⁽⁴⁾	Perform with ignition on.

⁽⁵⁾	Perform with ignition off.

Fig 1: Identifying Turbo Meter Drive Circuit Terminals (Supra)