Programed Repairs Engine 103 Combustion IV KE Injection
30 Accelerator control
Complaint: ASR indicator light comes on when driving and electronic accelerator pedal moves into emergency running mode (cannot easily be depressed after short idle travel) |
Cause/Remedy
1. Control unit of electronic accelerator pedal.
Check production date of control unit part
no. 126545 07 32 (see ill.).
Control units with production dates from 16/88 up to 43/88 must be replaced with a control unit as of production date 44/88 (identification: yellow dot) or by the control unit part no. 126 545 08 32 (as of August 1989) if this fault occurs.
2. Check accelerator control, adjust (30-1010).
3. Replace position sensor (R25).
Complaint: Jerking during load changes |
This complaint relates to the engines in the models 124, 201 with manual transmission and LHD version.
Remedy
Install modified accelerator pedal lever.
Adjust accelerator control (30-1010).
Part no.
Model | 124 | 201 |
Accelerator pedal lever | 124 300 04 25 | 201 300 09 25 |
Bush | 124 301 04 18 | 201 301 03 18 |
Stop | 124 300 01 41 | 124 300 01 41 |
Production breakpoint: 11/88
Model | Vehicle ident end no. |
124 | A 907 056 |
201 | A 473 115 |
Complaint: Cruise control does not operate. During adapter test, LED for speedometer shows steady light, in contrast to the information on the test card (only with speed-responsive volume control for Becker Elektronik radio) |
Cause
1. Blue control cable from cruise control connection and speedometer to volume control of radio has short to ground.
2. Volume control faulty.
Remedy
1. Test blue control cable for volume control for short to ground; repair if necessary.
2. Replace volume control of radio.
Complaint: Electric cruise control: changes in speed (surging) of about 2 - 3 km/h at intervals of 3 - 4 s. This relates to the 50 - 80 km/h speed range |
Cause
Shape of the fulcrum lever.
Remedy
Install new fulcrum lever, part no. 103 070 28 21.
Production breakpoint: phased in from 11/85
a 1st version
b 2nd version
Complaint: Vehicle jerks when cruise control switch is held in "Decelerate" position |
Remedy
Set connecting rod of accelerator control actuator about 2 - 3 mm or 2 - 3 turns shorter.
Complaint: Car runs about 10 km/h beyond the set speed; in addition, jerking may occur at higher speeds Vehicles (without ASR) with cruise control from about 01/89 |
This complaint relates to vehicles with reference connector the Tempomat cruise control unit.
Cause
Contact resistance at the connector pins for the reference connector.
Remedy
Remove black rubber seal between control unit and reference connector and install in its place a new grey rubber seal. Request parts from VP/SPB.
Production breakpoint
Control unit with modified rubber seal (grey): 12/89.
Complaint: Cruise control surges by 5 to 7 km/h over entire speed range |
Note
The fault can be clearly felt when the speed is increased with the cruise control switch. The vehicle accelerates further by about 5 to 7 km/h after the switch is released, speed drops off again and the speed change then occurs constantly.
Cause
Cruise control unit faulty.
Remedy
Test cable harness for short circuit. If cables are o.k., replace actuator and then cruise control unit.
Complaint: Cruise control sometimes does not operate |
Cause
Poor contacts at the control unit (2) as a result of the sockets widening.
Remedy
Bend in sockets; ensure that the connector is correctly assigned.
Location on model 107
Complaint: Electric cruise control cannot be set, switches off when driving or vehicle jerks |
Cause
Road speed signal from Hall sensor at instrument cluster has occasional open circuit.
Remedy
Install improved Hall sensor, part no. 007 542 29 17, as of production 06/88.
Complaint: Electric cruise control: vehicle on flat road up to 65 km/h and when climbing hills Models 107, 124, 126 up to about 09/87 |
Cause
Decel fuel cutoff is not deactivated when cruise control operated. Can be checked by disconnecting the coupling of the decel fuel cutoff microswitch (S27/2) at the fulcrum lever. The jerking then no longer occurs.
Remedy
1. Test the plug connection of the white wiring X26 (contact 11) or X33. If the plug connection X26 (contact 11) or X33 is not plugged together, the ends of the cables are at the following points:
Model | End of cable of engine harness | End of cable of cruise control harness |
107 | Tied back in engine compartment in area of plug connection of cruise control actuator at wiring harness | Loose in area of diagnostic socket |
124 up to about 08/85 | Tied back in fuse/relay box about 150 mm form plug connection X26 at wiring harness | Loose in fuse/relay box |
124 as of about 09/85 | In fuse/relay box in plug connection X26 contact 11 | Loose in fuse/relay box |
126 | Tied back in fuse/relay box at wiring harness | Loose in fuse/relay box |
2. If point 1 is in order, test white cable on model 107 between plug connection of actuator (contact 7) and coupling of KE control unit (contact 6) or models 124, 126 and 201 between coupling of cruise control unit (contact 5) and coupling of KE control unit (contact 6) for open circuit.
3. If items 1 and 2 are in order, replace KE control unit.
Location X33 on model 107 in area of plug connection of cruise control actuator
Location of X33 on model 124 up to about 08/85 in fuse/relay box
Location of X26 on model 124 as of about 09/85 in fuse/relay box
Location of X33 on model 126
in fuse/relay box
Complaint: Cruise control does not operate after replacing or installing a control unit, |
Cause
Bridge in control unit from contact assignment 13 to 14.
Remedy
Remove ground bridge in the 14-pin connector for control unit from contact 12 to contact 14. Connect ground cable or cables to contact 12. Contact 14 is no longer assigned.