Engine Sensor Testing - Surtek MUL04 Manual De Usuario Y Garantía

is installed right in the position and the dwell of the meter can also indirectly
used for the testing.
a. Start the engine of the automobile to achieve a rotation speed of 3000 RPM.
So far as a GM automobile is concerned, set the rotary switch to the DWELL
and select 6CYL.
b. When the automobile is operating in a short fuel state or in a long fuel state,
the dwell of the meter should be displayed between 10º and 50º.
2. Fuel Injector Resistance Testing (see Fig. 13)
The testing method is similar to that of the resistance of an ignition coil.
a. Cut the electric link off the injector.(Refer to the servicing handbooks of
various kinds of automotive manuals for the detailed position.).
b. Conecte el cable de prueba rojo y negro a los dos extremos del inyector. La
resistencia normal general es menor o igual a 10 Ω.
10. Engine Sensor Testing (see Fig. 14)
Fig. 14
To be adapted to the provisions for low injection and fuel saving in the early
period of the eighties, the computercontrolled regulators were installed in the
automobile and the sensors provided the computer with some data required. The
multimeter is an effective tool for the detection of the operation of a sensor.
1. Oxygen Sensor
The oxygen sensor is used to test the oxygen content in the exhaust, giving rise to
an appropriate voltage or resistance. A low voltage (high resistance) means a too
high oxygen content in the exhaust, while a high voltage (low resistance) means a
too low oxygen content. The computer regulates the ratio between the air and the
fuel according to the high or low voltage. There are normally two types of oxygen
sensors: the zirconia and titania sensors. (Refer to the different external properties
of the two types for the details.).
Testing Procedure:
a. Move the oxygen sensor out of the automobile.
Fig. 13
E N G L I S H •
Use r's M a nual
41