Intake System For Leaks (False Air), Checking

Intake System For Leaks (False Air), Checking

Recommended special tools and equipment
- Engine leak detection spray G 001 800 A1

NOTE:
- Vacuum in the intake system sucks in the leak detection spray with false air. Leak detection spray decreases ignition quality of the fuel mixture. This causes a reduction in engine speed and a sharp increase of CO content.
- It is absolutely necessary to follow the safety precautions listed on the can.

Test requirements:
- Coolant temperature at least 80 degrees C; "PID 05: Coolant temperature". Diagnostic Mode 01 - Read Current System Data
- Ignition switched off.

Test sequence
- Connect diagnostic tester. VAS 5051, Connecting and Select Functions
- Start engine and let run at idle.
- In diagnostic function "33 - OBD", select "Mode 1: Checking measured values."

NOTE: Bank 1 = cylinder bank 1 in direction of travel, right; Bank 2 = cylinder bank 2 in direction of travel, left.

- Select the following measured values:







- Spray intake system parts with engine leak detection spray in a systematic manner.

If engine speed drops or if the short-term gasoline-air ratio changes:
- End diagnosis and switch ignition off.
- Check sprayed part of intake system for leaks, and repair the malfunction.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If DTC memory was erased, generate readiness code.

- End diagnosis and switch ignition off.