Turbo Boost Gauge & Sensor Test
- Unplug 3-pin boost sensor electrical connector, located on right side of firewall. Turn ignition on. Measure voltage between Yellow/Green and Black wires. Battery voltage should exist. If voltage is as specified, go to next step. If voltage is not as specified, repair Yellow/Green or Black wires as necessary.
- Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. With boost sensor disconnected, measure resistance of 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 not less than 5 ohms, repair White/Black wire.
- Ground White/Black wire at boost gauge. Boost gauge should indicate low. Apply 12 volts to White/Black wire at boost gauge. Boost gauge should indicate 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 wiring. With ignition on and boost sensor disconnected, connect jumper wire between Yellow/Green and White/Black wires of boost sensor harness connector. Boost gauge should indicate high. If boost gauge indicates high, replace boost sensor. If boost gauge does not indicate high, go to TROUBLE SHOOTING for other possible causes.