With Generic Scan Tool

READINESS CODE, GENERATING

Requirements






- The respective fuses of the Motronic fuel injection and ignition system must be OK.

- Battery voltage must be at least 11.5 volts.

- All electrical consumers such as, for example, lights and rear window defroster must be switched off.

- If vehicle is equipped with an A/C system, it must be switched off.

- Parking brake must be engaged or else daylight driving lights will be switched on.

- Ground (GND) connections between engine, transmission, and chassis must be OK.

- There must not be any DTCs stored in DTC memory, Diagnostic mode 3: Check DTC memory.

- Intake air temperature 5 to 60° C, Diagnostic mode 1: Check measured values; PID 15: Intake Air Temperature (IAT).

Work procedure

- Connect diagnostic tester.

- Turn ignition on for 30 seconds.

- Start engine and let run at idle.

Check fuel tank ventilation.

Increase engine speed for 90 seconds to 3000 to 3500 RPM to warm up the catalytic converter.

Note:

- Engine speed, Diagnostic mode 1: Check measured values; PID 12, engine rotations per minute.

Testing Secondary Air Injection (AIR) system for proper seal.

- Let engine run at idle for 1 minute.

Testing oxygen sensors for aging.

- Increase engine speed to 2200 to 3300 RPM for 3 minutes.

Testing oxygen sensors in partial throttle range

- Perform a road test.

The following operating conditions must be met during this road test:

- Drive for 15 minutes in 3. gear or in driving mode "3" on a level driving surface at a constant vehicle speed with an engine speed of 2000 to 2800 RPM.

Observe the safety precautions that apply to road tests.

Notes:
- Vehicle speed, Diagnostic mode 1: Check measured values; PID 13, Vehicle speed.
- Engine speed, Diagnostic mode 1: Check measured values; PID 12, engine rotations per minute (RPM).

- Accelerate vehicle uniformly, not at Wide Open Throttle (WOT).
- Avoid coasting operation (throttle valve closed) while driving.

- After 15 minutes, downshift until an engine speed of 2800 to 3500 RPM has been reached.

- Drive in deceleration mode at an engine speed up to approx. 1800 RPM.

- Park vehicle and let engine run at idle for 15 minutes.
- Accelerator pedal must not be operated during this time.

- Read readiness code.

If in 8-digit number block:

- Display position 5: Secondary Air Injection (AIR) system

and/or

- Display position 6: EVAP canister system

a 1 instead of 0 is displayed:

- Repeat complete work procedure.