Turbo Meter Drive Circuit (Celica & MR2)

Disconnect turbo pressure sensor connector. Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Inspect cluster wiring harness connectors/terminals for damage or poor connections.
Using DVOM, check turbo meter drive circuit terminals for correct values. See Fig 1. See TURBO METER DRIVE CIRCUIT SPECIFICATIONS TABLE (CELICA & MR2) . If values are not as specified, replace turbo meter drive circuit.

TURBO METER DRIVE CIRCUIT SPECIFICATIONS (CELICA & MR2)

Connector-Terminal

Ignition

Specified Value

Resistance Check

"A" - "B"

Off

Continuity

"C" - 2 ⁽¹⁾

Off

Continuity

"D" - Ground

Off

Continuity

1 ⁽¹⁾ - Ground

Off

Continuity

Voltage Check

"E" - Ground

Off

Zero Volts

"E" - Ground

Battery Voltage

3 ⁽¹⁾ - Ground

Off

Zero Volts

3 ⁽¹⁾ - Ground

Battery Voltage

⁽¹⁾	Terminal number is located on turbo pressure sensor wiring harness connector. See Fig 1.

Fig 1: Turbo Meter Drive Circuit Terminal ID (Celica & MR2)