Engine	120.980/981
Models	140.057/076, 129.076
LH-SFI system designation	4.1
Closed throttle (idle) position, check, adjust SMS job No. 07-1100 Throttle valve angle ° Engine coolant temperature ° C approx. Engine oil temperature ° C approx. Engine speed (selector lever in P/N position) rpm Injection duration ms Air mass kg/h Hot wire voltage V O2S voltage (oscillates around 300mV after 2 min.) mV On-off ratio readout with ignition: ON Engine coolant temperature <70°C % Engine coolant temperature >70°C % Self adaptation idle air kg/h Self adaptation factor upper/lower range of part load Ignition timing with premium unleaded fuel (91 posted/95 RON) °CKA Air pump after start, max. 20 sec. <40° C Purging, >46° C intake air HHT display Exhaust gas recirculation. air mass > 130 kg/h HHT display Safety fuel shut off > 1100/min HHT display Cylinder shut off/ignition miss HHT display	0.3 - 2 >80 60 - 80 600 - 750 2.8 - 3.2 14 - 20 1.3 - 1.7 -200 to +1000 50 50±10 1) 0±1.5 2) 0.85 - 1.15 3) 5 - 15 4) ON ON ON OFF 5)

1) In case of complaint, lambda must be measured at idle speed and at 2500 rpm with purge line to engine disconnected and plugged. 2) Base setting idle, 0.0 kg/h (Bosch), mixture tendency rich , 0.0 kg/h, mixture tendency lean > 0.0 kg/h. 3) Base setting part load = 1.0, mixture tendency rich <1.0 mixture tendency lean > 1.0. 4) Refer to DI testing. 5) Defective cylinder is highlighted. Further tests to be carried out using engine tester.

Engine	120.980/981
Models	140.057/076, 129.076
LH-SFI system designation	4.1
Closed throttle (idle) position, check, adjust SMS job No. 07-1100 Engine coolant temperature ° C approx. Engine oil temperature ° C approx. Engine speed (selector lever in P/N position) rpm Intake air temperature ° C Altitude mbar Ignition timing with premium unleaded fuel (91 posted/95 RON) °CKA Reference resistor DI HHT display Transmission overload protection switch (selector lever in P/N position) HHT display LH-SFI control module voltage circuit 30 V Manifold absolute pressure mbar Knock sensing active HHT display Knock retard/cylinder °CKA Combustion voltage/cylinder V Combustion duration/cylinder ms Combustion duration difference between cylinders ms	>80 60 - 80 600 - 750 <30 check barometer 5 - 15 1) OFF 11 - 14 580-630 OFF 0.0 25 - 70 2) 1.2 - 1.7 2) 0.3 2)

1) Refer to DI reference resistors. 2) Display only on Bosch control modules.

Engine	120.980/981
Models	140.057/076, 129.076
LH-SFI system designation	4.1
Cold start Engine coolant temperature ° C approx. Engine rpm Starter signal circuit 50, during starting process HHT display After start enrichment < 70° C max. 20 sec. HHT display Closed throttle contact (accelerator pedal not depressed) HHT display LH-SFI control module voltage circuit 30 V Fuel pump HHT display	1) 1) ON ON ON 11 - 14 2) ON
Warmup Transmission selector lever position Engine coolant temperature ° C approx. Closed throttle warmup speed rpm Engine coolant temperature ° C approx. Closed throttle warmup speed rpm Warmup HHT display Closed throttle contact (accelerator pedal not depressed) HHT display AIR pump after >20 sec. HHT display Intake air temperature ° C	P/N -30 to +30 850 +100 -50 >+30 to +80 declines continuously to 600 - 750 <70° C ON >70° C OFF ON 2) OFF >20

1) Temperature at which complaint occurs. 2) Connecting harness to EA: -with open circuit or short to positive indicates OFF constantly. -with short to ground indicates OFF constantly.

Engine	120.980	120.981
Models	140.057/076	129.076
LH-SFI system designation	4.1	4.1
Engine performance 1) Engine speed rpm Ignition timing with premium unleaded gasoline (91 posted/95 RON) °CKA Injection duration ms Air mass kg/h Hot wire voltage V Altitude mbar Wide open throttle recognition HHT display Acceleration enrichment HHT display Deceleration fuel shut off >2100 rpm HHT display Camshaft timing adjustment >2000 rpm HHT display Vehicle speed signal mph (km/h) Raised shift point HHT display Output, transmission range 3 hp	3800/4000 18 - 22 12 - 17 360 - 420 18 - 22 refer to barometer ON ON ON OFF >62 (100) OFF 228/248 2)	4000 18 - 22 12 - 17 360 - 420 18 - 22 refer to barometer ON ON ON OFF >62 (100) OFF 243

1) These are minimum performance values. Do not exceed speed of 80 mph. Check performance only at simulated engine coolant temperature of 80 °C and intake air temperature of 20 °C (use 2 resistance substitution units). 2) Without wide open throttle enrichment.

Engine	Model	MB Part No.	Ignition adjustment ° CKA	Resistance /k
120.980 120.981	129.076 140.057	015 545 67 28	0	2.4 k (premium unleaded 91 posted/95 RON)

Note: If the reference resistor is missing, the ignition is retarded 3° at wide open throttle.