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.1983 Mercedes Benz 380SL.Rare 5 Speed Manual Transmission. 1 Owner - Euro Specs - Only 51,000 miles - European cloth interior - Beautiful color combination - 4.
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- The Mercedes-Benz R107 and C107 are sports cars which were produced by Mercedes-Benz from 1971 through 1989, being the second longest single series ever produced by the automaker, after the G-Class. They were sold under the SL (R107) and SLC (C107) model names as the 280 SL, 280 SLC, 300 SL, 350SL, 350SLC, 380SL, 380SLC, 420SL, 450SL, 450SLC.
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< PREV PAGENEXT PAGE >Page 1Oxygen Sensor: Testing and Inspection
The frequency valve is operated by pulsating voltage from the electronic control unit. By measuring this signal, certain functions of the system can be
tested. A special tester (Bosch KDJE 7453) is recommended, but a high quality analog volt meter can be used instead.
1.
Remove cap from diagnostic plug connector (rear of left fender panel). Connect positive lead of volt meter to positive battery terminal, and the
negative lead to pin 3 of the diagnostic plug.
2.
Start engine and run until warm. Disconnect oxygen sensor and observe the meter needle (It should not fluctuate). Place a piece of tape on the
meter face to indicate the 50% position.
3.
Remove fuel pump relay and connect jumper wire across sockets corresponding to terminals 30 and 87. If equipped, remove plug at air flow
sensor. Turn ignition 'ON'. Reconnect oxygen sensor.
4.
The frequency valve should operate, making a buzzing noise. Volt meter should indicate 45-65% (relative to reference mark). Disconnect oxygen
sensor and touch the wire to the ECU to ground. Readings on the meter should rise. Ground one end of a 1.5v flashlight battery, and touch
positive end to the ECU wire. The readings should drop to almost 0.
5.
Operate throttle. Readings should be higher at idle or wide open throttle.
6.
Connect temperature sender lead to ground. The reading should rise.
1981 Mercedes 380sl Manual
7.
Connect oxygen sensor and start engine. With a cold engine, meter reading should be stable. When engine warms up, meter needle should
fluctuate equally to either side of the reference mark. It may be necessary to run the engine faster than idle to heat up oxygen sensor and cause
needle fluctuation.
1985 Mercedes 380sl Owners Manual
8.
Connect a CO meter to exhaust test point (upstream of catalytic converter). With oxygen sensor disconnected, the reading should be stable on the
meter. Note the CO% reading. With ECU lead grounded, meter reading should rise, and CO% increase. With lead connected to the flashlight
battery, meter reading and CO% should decrease.
a. If meter reading does not rise with lead grounded, check wiring and replace ECU if wiring is ok.
b. If meter reading does not change with battery connected, check wiring and replace ECU if wiring is ok.
c. If meter reading rises but the CO% does not, check frequency valve wiring and replace valve if wiring is ok.
d. If meter reading decreases but CO% does not, check frequency valve wiring and replace valve if wiring is ok.
9.
1983 Mercedes 380sl Repair Manual
Adjust CO% to a rich level (about 3%) with oxygen sensor disconnected. Reconnect sensor. Reading should drop at least 1%. If it does not,
replace the oxygen sensor.