Turbo Boost Gauge & Sensor Test
- Disconnect 3-pin boost sensor electrical connector located on right side of firewall. Turn ignition on. Measure voltage between Yellow/Green and Black wires. Voltage should be greater than 10 volts. Turn ignition off. If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, repair Yellow/Green or Black wires as necessary.
- Remove instrument panel. See INSTRUMENT PANEL under REMOVAL & INSTALLATION. Disconnect instrument panel 8-pin connector. With boost sensor disconnected, measure resistance through White/Black wire between instrument panel and boost sensor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair or replace White/Black wire.
- With 8-pin instrument panel connector disconnected, ground White/Black wire at boost gauge. Boost gauge should read low. Apply 12 volts to White/Black wire at boost gauge. Boost gauge should read high. If boost gauge operates as specified, go to next step. If boost gauge does not operate as specified, replace boost gauge.
- Reconnect instrument panel connectors (if removed). With ignition on and boost sensor disconnected, install jumper wire between Yellow/Green and White/Black wires of boost sensor harness connector. Boost gauge should read high. If boost gauge reads high, replace boost sensor. If boost gauge does not read high, go to TROUBLE SHOOTING for other possible causes.