Checking and adjustment of the idling speed - ra07016022053x(2053)
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Engines 602.96, 603.96/97 TURBO in Models 124, 126, 140, 201
Preceding work:
Operation no. of operation texts and work units or standard texts and flat rates: 07-2053 or 2056
| Tester (001) and pulse generator (021) | connect, disconnect. |
|
NOTE:
On model 140 the TDC sensor is installed on the body in the diagnostic socket (X11/4).
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| Accelerator control | examine for ease of operation. |
| Idle stop on Bowden cable | check, the spring plate (226) must be resting against the compression spring (227) free of tension. |
| Engine | warm up to operating temperature (coolant temperature approx. 80 °C). |
| 2-pin coupling at actuator (Y22) | unplug, plug in. |
| Idling speed | check, adjust (see table). Slacken locking nut (3a) for this step. |
| Engine running | check. Switch on all ancillaries for this step. |
TEST AND ADJUSTMENT DATA
| Engine | Electronic idle speed control | |
|---|---|---|
| Idle speed rpm with control | Idle speed rpm Connector at actuator unplugged without control | |
| 602.96 man. transmission | 740 ± 20 | 690 ± 40 |
| 602.96 aut. transmission | 680 ± 20 | 620 ± 40 |
| 603.96 | 630 ± 20 | 570 ± 40 |
| 603.96, 4MATIC with man. transmission | 680 ± 20 | 620 ± 40 |
| 603.970 | 630 ± 20 | 570 ± 40 |
| 603.971 | 610 ± 20 | 560 ± 40 |
Adjusting idle speed by means of resistance trimming plug only Model Years 1986, 1987
If complaints are received regarding idling speed, it is possible to vary the idling speed.
The positions of the resistance trimming plug are listed in the table opposite.
| Position of resistance trimming plug | Engine 602 | Engine 603 |
|---|---|---|
| 1 | 610 ± 20 | 570 ± 20 |
| 2 | 630 ± 20 | 590 ± 20 |
| 3 | 650 ± 20 | 610 ± 20 |
| 4 | 680 ± 20 | 630 ± 20 |
| 5 | 700 ± 20 | 650 ± 20 |
| 6 | 720 ± 20 | 670 ± 20 |
| 7 | 740 ± 20 | 700 ± 20 |
Special tool
COMMERCIALLY AVAILABLE TOOLS AND TESTERS
| Designation | e. g. make, order no. |
| Multimeter | Sun, DMM-5 |
| Digital tester | Bosch, MOT 002.01 Sun, DIT 9000 |
Adjusting
- Connect digital tester (001) and pulse generator (021).
- Examine accelerator control for ease of movement and condition.
Checking idle stop:
For this step, the spring plate (226) of the Bowden cable (230) must be resting against the compression spring (227) free of tension.
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
- Warm up engine to operating temperature (coolant temperature approx. 80 °C).
- Unplug 2-pin coupling at actuator, plug in.
- Check idling speed, adjust by slackening locking nut (3a).SPECIFICATIONS CHART
Engine Idling speed rpm with control Idling speed rpm Connector at actuator unplugged without control 602.96 manual transm. 740 ± 20 690 ± 40 602.96 autom. transm. 680 ± 20 620 ± 40 603.96 630 ± 20 570 ± 40 603.96, 4MATIC with man. transm. 680 ± 20 620 ± 40 603.970 630 ± 20 570 ± 40 603.971 610 ± 20 560 ± 40 - Switch on all ancillaries and check smooth engine running.