VANOS Solenoid Valve - Function Check Precaution (11 05 93 (3799))

Publication date: 1993-06-01
Reference number: 11 05 93 (3799)

VANOS SOLENOID VALVE - FUNCTION CHECK PRECAUTION

TECHNICAL SERVICE BULLETIN

Reference Number(s): 11 05 93 (3799)

VANOS SOLENOID VALVE

Model(s): 1991-on BMW (E34) 525i With M50 TU (VANOS) Engine

1992-on BMW (E36) 325i, 325is (E34) 525iT With M50 TU (VANOS) Engine

1994-on BMW (E36) 325iC With M50 TU (VANOS) Engine

Group: 11 - Engine

Bulletin No.: 11 06 93 (3799)

Date: June 1993

SITUATION

To reduce the high voltage spikes produced by the VANOS valve during its switching process (energizing/de-energizing the solenoid), a diode is incorporated into the valve's plug connector.

NOTE: When checking the VANOS solenoid valve for proper function with special tool 126 410, always ensure that the electrical connections (alligator type clips-red boot B+/black boot B-) are not reversed on the power source being used to avoid damaging the internal diode.

WARRANTY INFORMATION

Warranty Status: Information Only.