Test requirements:

• Fuses for engine electronics OK

  See appropriate System Wiring Diagram article.

• Ground (GND) connections at engine and transmission OK
• Battery voltage at least 12.7 V
• Exhaust system free of leaks.
• Vehicles with automatic transmission Selector lever in position "P" or "N".
• Electrical consumers switched off (radiator fan must NOT run during test).
• A/C switched off.
• No DTCs in DTC memory; check DTC memory. See MODE 3: CHECK DTC MEMORY .
• Throttle valve angle 12.0 to 16.0%. See MODE 1: CHECK MEASURING VALUES .

Let vehicle cool off with the ignition switched off until the following conditions are met:

• Intake air temperature 10 to 50 °C. See MODE 1: CHECK MEASURING VALUES .
• Coolant temperature approximately Intake Air Temperature (10 to 50 °C). See MODE 1: CHECK MEASURING VALUES .