Mercedes Benz Workshop Service and Repair Manuals

Oxygen Sensor: Electrical Specifications

AIR/FUEL MIXTURE

With On/Off Ratio Tester [1] ....................................................................................................................................... Readout oscillating At 50% ± 10%

CIS-E CONTROL UNIT

Operating Voltage ............................................................................................................................................................................................. 11-14 volts

CRANKSHAFT POSITION SENSOR

Terminal 7 and 31d .................................................................................................................................................................................... 680-1200 ohms
Terminal 7 and Ground ..................................................................................................................................................................................... >199 ohms

COOLANT TEMPERATURE SENSOR

Resistance .................................................................................................................................................................................. 2.2-2.8k ohms (at 68F °F)

DECEL FUEL-CUTOFF SPEED

Road Speed >12.5 mph, Throttle Closed ......................................................................................................................................................... >1440 RPM

EZL REFERENCE RESISTOR

Resistance ............................................................................................................................................................................................................ 750 ohms

ELECTRO-HYDRAULIC ACTUATOR

Current With Ignition "ON", Engine "Off" ................................................................................................................................................ Approx. 20 mA

IDLE CONTROL VALVE

Current Range, Warm Engine, Idling In "P" Or "N" ....................................................................................................................................... 600 ±50 mA

MAXIMUM ENGINE SPEED

Cutout RPM ......................................................................................................................................................................................................... 7000 ±50

MAXIMUM VEHICLE SPEED

CIS-E 5 Controlled .............................................................................................................................................................................................. 155 MPH

OXYGEN SENSOR

Operating Voltage (engine running) .............................................................................................................................................................. 0.4 - 1.0 volts
Heater current draw ............................................................................................................................................................................................ 0.5 - 1.3 A
Heater Resistance ................................................................................................................................................................... 3 ohms (cold) 13 ohms (hot)

[1] At Diagnostic socket, with on/off ratio tester, and O2 sensor

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