Throttle Valve Switch: BMW
- Connect Bosch tester (0684 100 202) to ECU. Set cylinder selector switch to "6" and program selector switch to "5". Turn ignition on. Tester gauge should read 0 ohms with throttle valve at idle position; infinite for partial throttle valve position and 0 ohms for full throttle valve position.
- If throttle valve switch does not perform as described, loosen throttle switch screws and place throttle valve in idle position. At idle, tester reading should be 0 ohms. When throttle valve is moved 0.118 - 0. 157" (3-4 mm), tester reading should read infinity. If relocating throttle switch does not produce above results, replace throttle switch.
NOTE:
Throttle switch contacts can be tested for continuity on 633CSi and 733i models with an ohmmeter. With ohmmeter connected between terminal 18 (center) and 2 (top), 0 ohms should be measured with throttle at idle. With ohmmeter connected between terminal 18 and 3 (bottom), 0 ohms should be measured with throttle at full throttle position.