0100 - Checking and adjustment of the idle speed (note deviations for off-road vehicles) Engines 601, 602.91, 603.91 · ra07016010100x · Mercedes-Benz WIS

07.1-100 Checking, adjusting idle speed

Job no. of Job Texts and Work Units
or Standard Texts and Flat Rates 07-2053 and 2056

0100 - Checking and adjustment of the idle speed
(note deviations for off-road vehicles)
Engines 601, 602.91, 603.91

Digital tester (001) and pulse generator (021)	connect, disconnect.
Control	check for easy operation.
Idle speed stop on Bowden cable	check, spring retainer (226) must contact the compression spring (227) without preload.
Bring engine to	60-80 °C coolant temperature.
Double coupling of electromagnetic actuator (Y22)	pull off, refit.
Idle speed	check, adjust.
Smooth engine running	check. Depress service brake. Move selector lever into Drive position. Switch on AC compressor. Turn power steering to full lock. Engine must continue to run smoothly.

Test and adjusting values

Engine	Idle speed 1/min Electronic idle speed control (ELR)
	Pneumatic idle speed increase	with control	without control Plug on electromagnetic actuator pulled off
601	75050	72020	66040
602	70050	68020	62040
603.912 603.9131)	-	63020	58040
603.9132)	-	68020	62040

1) Automatic transmission
2) Manual transmission

Special tools

Note
Pulse generator 601 589 04 21 00 is only for engine 601 with left connection.

Commercially available tools


Digital tester	e.g. Bosch, MOT 002.01 Sun, DIT 9000

Adjusting

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1 Connect digital tester (001) and pulse generator (020).

2 Check control for easy operation and condition.

Check idle speed stop; in idle speed position the spring retainer (226) of the Bowden cable (230) must contact the compression spring (227) without preload.

Adjust adjusting nut (232) of Bowden cable (230) from the vehicle inside if required.

3 Run engine up to 60-80 °C coolant temperature.

Engines 601 and 602 with pneumatic idle speed increase
4 Check idle speed, adjust by turning the vacuum unit (4) if required and loosening lock nut (4a) beforehand.


Engine	Idle speed
601	75050
602	70050

Engines 601, 602 and 603 with electronic idle speed control

5 Pull double coupling off electromagnetic actuator.

6 Loosen lock nut (arrow) and adjust idle speed
left = higher speed
right = lower speed

Test values see table Test and adjusting values

7 Check smooth engine running.
Depress service brake.
Move selector lever into Drive position.
Switch on AC compressor.
Turn power steering to full lock.
Engine must continue to run smoothly.

0100 - Checking and adjustment of the idle speed (note deviations for off-road vehicles) Engines 601, 602.91, 603.91

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