Intake System, Checking For Leaks

Intake System, Checking for Leaks

Checking with Engine Leak Detection Spray

Special tools, testers and auxiliary items required

• Engine leak detection spray G 001 800 A1

Test Prerequisite

• Coolant temperature must be at least 80 °C => [ Diagnostic Mode 01 - Read Current System Data ] Diagnostic Modes 01 - 09, Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.

Test Sequence

• 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 drop in engine speed and changes the value produced by the Heated Oxygen Sensor (HO2S).

• It is absolutely necessary to follow the safety precautions listed on the can.

- Connect diagnostic tester.

- Start engine and let run at idle.

- Under address word 33, select "Diagnostic mode 1: Checking measured values."
• Bank 1 = cylinder bank 1 in direction of travel, right.

• Bank 2 = cylinder bank 2 in direction of travel, left.

- Select the following measuring values:





- Systematically spray the components of the intake system with engine leak detection spray.

If engine speed decreases or the short-term gasoline-air ratio changes:

- End diagnosis and switch ignition off.

- Check sprayed portion of intake system for leaks and repair malfunction.

- Check DTC Memory.

- Read out readiness code => [ Readiness Code, Reading ] Monitors, Trips, Drive Cycles and Readiness Codes. If DTC memory was erased, readiness code must be generated => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.