Mercedes-Benz
- Turn the ignition switch to the on position (see Fig.). All the electronic gauges on the ICU (instrumentation control
unit) complete a full sweep of their dials, the warning and indicator
lights light up, and the buzzer sounds for three seconds.
Fig. 1, Ignition Switch Positions
- Turn the ignition switch to the start position. Without touching the throttle pedal, start the engine.
- Idle the engine for one to three minutes at 600 to 850 rpm before operating the engine under load.
- Check the oil pressure gauge for any drop in lubricating
oil pressure or mechanical malfunction in the lubricating oil system.
Minimum oil pressure at idle is 7 psi (50 kPa).
Caution: Do not rev the engine if the oil pressure gauge indicates no oil pressure. Shut down the engine if no oil pressure appears within approximately ten seconds. Check to determine the cause of the problem. Operating the engine with no oil pressure will damage the engine.
Caution: Never attempt to start any Mercedes-Benz electronic engine using ether or any other starting fluid. Serious engine damage could result.
Note: Before doing these steps, do the steps in "Prestart".
Important: On vehicles equipped with an intake air preheater, the INTAKE HEATER indicator stays on for a minimum of two seconds, regardless of coolant temperature. Wait until the INTAKE HEATER indicator goes out before attempting to start the engine.
Note: Some starters are equipped with optional overcrank protection. If overcranking occurs, a thermostat breaks the electrical circuit to the starter motor until the motor has cooled.