mercedesbenz Workshop Repair Guides

Mercedes Benz Workshop Service and Repair Manuals

Engine Control Module|Locations > < Acceleration Enrichment Module|Testing and Inspection
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Engine Control Module: Specifications

CIS-E Control Unit Operating Voltage...................................................................................................................................................................11-14 volts
Crankshaft Position Sensor (terminal 7 and 31d).............................................................................................................................................680-1200 ohms
Crankshaft Position Sensor (terminal 7 and Ground)..............................................................................................................................................>199 ohms
Coolant Temperature Sensor resistance ..........................................................................................................................................2.2-2.8k ohms (at 68F °F)
Decel Cutoff Speed [1]..........................................................................................................................................................................................>1100 RPM
EZL Reference Resistor.............................................................................................................................................................................................750 ohms
Electro-Hydraulic Actuator [2]........................................................................................................................................................................Approx. 75 mA
Idle Control Valve Current Range [3].................................................................................................................................................................700-1000 mA
Maximum Engine Speed Cutout................................................................................................................................................................................6000 ±50
Oxygen Sensor Heater Resistance................................................................................................................................................3 ohms (cold) 13 ohms (hot)
Oxygen Sensor Operating Voltage (engine running)...........................................................................................................................................0.4 - 1.0 volts
Oxygen Sensor Heating Element current draw.........................................................................................................................................................0.5 - 1.3 A
Air/Fuel Mixture (On/Off Ratio) [4]..........................................................................................................................................................Readout oscillating

[1] Road speed >12.5 mph, throttle valve idle contact closed.
[2] Engine not running, ignition "ON"
[3] In P or N, idling at operating temperature.
[4] At Diagnostic socket, with on/off ratio tester, and O2 sensor

connected.  Reading should be within +10 of value at 2500 RPM.

Engine Control Module|Locations > < Acceleration Enrichment Module|Testing and Inspection