With Generic Scan Tool

Checking Intake System For Leaks (Unmetered Air)

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

NOTE:
- The negative pressure in the intake system sucks in the leak detection spray with the unmetered air. Leak detection spray decreases ignition quality and performance 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 degree C "Mode 1: Check measuring values"; "PID 05: Coolant temperature". Diagnostic Mode 1: Check Measured Values
- Ignition switched off.

Test sequence
- Connect diagnostic tester. Text Box, Connecting For Wiring Test
- Start engine and let run at idle.
- In diagnostic function "33 - OBD", select "Mode 1: Checking measuring values."

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

- Select the following measuring 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 eliminate the error.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1 - Check DTC memory, "Mode 3: Check DTC memory". Diagnostic Mode 3: Check DTC Memory
2 - If necessary, erase DTC memory, "Mode 4: Reset/erase diagnostic data". Diagnostic Mode 4: Check Reset/Erase Diagnostic Data
3 - Generate readiness code. Readiness Code, Generating

- End diagnosis and switch ignition off.