Instrument Panel Turbo Meter Check
- Unplug connector from turbocharger pressure sensor. On Celica Turbo, pressure sensor is in engine compartment on right side of firewall to right (as viewed from front of vehicle) of wiper motor. On Supra Turbo, pressure sensor is under hood on top of left side shock tower.
- Turn ignition on with engine off. Turbo meter needle should move to upper position. Ground terminal No. 2 on the wiring harness side. See Fig 1. Meter needle should move to lower position. If meter does not respond as described, go to step 3).
- Remove instrument cluster. Measure turbo meter resistance between Terminals "A" and "B" on the back of the instrument cluster. Resistance should be 72 ohms. Replace turbo meter is resistance is not as specified.
- To check turbo meter drive circuit. See TURBO METER DRIVE CIRCUIT SPECIFICATIONS table. Also, see Fig 2 for locations of Turbo Meter test terminals and Fig 1 for the location of the numerical test terminals of the 3-Pin harness connector.
NOTE:
The lettered test terminals in the following table refer to the terminals on the back of the instrument cluster as in Fig 2. The numerical test terminals refer to the ones on the 3-Pin harness connector as seen in Fig 1.
TURBO METER DRIVE CIRCUIT SPECIFICATIONS (CELICA)
| Check Between Terminals: | Condition | Specification |
|---|---|---|
| A-B | Constant | Continuity |
| C-2 | Constant | Continuity |
| D-Ground | Constant | Continuity |
| I-Ground | Constant | Continuity |
| E-Ground | Ignition in "LOCK" or "ACC" | No Voltage |
| E-Ground | Ignition in "ON" Position | Battery Voltage |
| 3-Ground | Ignition in "LOCK" or "ACC" | No Voltage |
| 3-Ground | Ignition in "ON" Position | Battery Voltage |