Readiness code, generating

Requirements 

• Fuses in E-box (plenum chamber, right) must be OK: Electrical Wiring Diagrams, Troubleshooting Component Locations

• Fuses in fuse box (instrument panel, left) must be OK: Electrical Wiring Diagrams, Troubleshooting Component Locations
• Battery voltage (both batteries) 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.

• 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 35° C → Diagnostic mode 1: Check measured values ; PID 15 ($F), Intake air temperature

Work procedure 

• Connect diagnostic tester → Diagnostic tester, connecting .
• Perform a road test.

Observe the safety precautions that apply to road tests → Safety precautions .

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

• Coolant temperature must reach at least 80° C → Diagnostic mode 1: Check measured values ; PID 5 ($5), Coolant temperature.

• Switch ignition off.

Let vehicle cool off with the ignition switched off until the following condition is met:

• Coolant temperature approx. intake air temperature (5 to 30° C) → Diagnostic mode 1: Check measured values ; PID 5 ($5), Coolant temperature.

• Perform a road test anew. The following operating conditions must be met during this road test:
• Accelerate vehicle uniformly, not at Wide Open Throttle (WOT).
• Drive for 10 minutes in the highest gear or in the highest driving mode on a level driving surface at a constant speed in the range of 65 to 80 km/h at an engine speed of 2000 to 2500 RPM.

• After 10 minutes, downshift until an engine speed of 2800 to 3500 RPM has been reached.
• Drive in deceleration mode at a speed up to approx. 1800 RPM.
• Park vehicle and let engine run at idle for 3 minutes.

• Accelerator pedal must not be operated during this time.

• Perform a road test anew. The following operating conditions must be met during this road test:
• Accelerate vehicle uniformly, not at Wide Open Throttle (WOT).
• Drive for 10 minutes in the highest gear or in the highest driving mode on a level driving surface at a constant speed in the range of 65 to 80 km/h at an engine speed of 2000 to 2500 RPM.
• Park vehicle and let engine run at idle for 3 minutes.

• Accelerator pedal must not be operated during this time.

• Read readiness code → Read readiness code .

If a1 is displayed instead of a 0 in the 8-digit number block:

• Perform a road test anew. The following operating conditions must be met during this road test:
• Drive for 10 minutes in the highest gear or in the highest driving mode on a level driving surface at a constant speed in the range of 65 to 80 km/h at an engine speed of 2000 to 2500 RPM.
• Park vehicle and let run at idle for 3 minutes.

• Accelerator pedal must not be operated during this time.

• Read readiness code → Read readiness code .

In 8-digit number block:

• Display position 5: Secondary air system

And/or

• Display position 6: EVAP canister system

A 1 instead of 0 is displayed:

• Repeat complete work procedure