Checking the Relay Power Supply

Checking The Relay Power Supply.







- Remove component: Main relay for the engine management system
























- Turn the ignition switch to the ON position.
- Connect test lamp 86 11 857 to pin 4 (86) of the relay holder and a good grounding point.







- The test lamp should light.

Checking the wiring harness.
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO - Rectifying the Lead - I

YES - Checking the Relay's Control Module Output