Turbocharging Pressure Sensor (Turbo)
- Ensure ignition is off. To check turbocharging pressure sensor supply voltage, disconnect electrical connector from turbocharging pressure sensor.
- On turbo models, sensor is mounted near the firewall, close to brake booster.NOTE: Turbocharging pressure sensor has a vacuum hose connected to it and may be identified by wire colors. See appropriate wiring diagram in WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
- Turn ignition on. Using voltmeter, measure voltage between terminals VC and E2 of harness connector. See Fig 1. Voltage should be 4.50-5.50 volts on turbo models.
- If voltage is not within specification, check wiring circuit. See appropriate wiring diagram in WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. If voltage is correct, turn ignition off and reinstall electrical connector on turbocharging pressure sensor.
- To check turbocharging pressure sensor output voltage, turn ignition on. Disconnect turbocharging pressure sensor vacuum hose from intake manifold. Connect voltmeter to terminals PIM and E2 of Electronic Control Unit (ECU). See Fig 2. See ECU LOCATION table.ECU LOCATION
Application Location Turbo Bottom Center Of Dash, In Front Of Console - Measure and record output voltage under ambient atmospheric pressure. Attach vacuum pump to turbocharging pressure sensor.
- Apply vacuum in specified increments and measure output voltage drop at each increment. See TURBOCHARGING PRESSURE SENSOR OUTPUT VOLTAGE SPECIFICATIONS table. Replace turbocharging pressure sensor if output voltage drop is not within specification.
TURBOCHARGING PRESSURE SENS OUTPUT VOLTAGE SPECS
| Applied Vacuum In. Hg | Output Voltage Drop |
|---|---|
| 3.94 | 0.15-.35 |
| 7.87 | 0.40-.60 |
| 11.81 | 0.65-.85 |
| 15.75 | 0.90-1.10 |
| 19.69 | 1.15-1.35 |