We connect the tester probes to the terminals "1" and "2" of the block of the wiring harness.
With the ignition on, the voltage should be 4.5-5.5 V.
Otherwise, check the health of the circuits (open and short to ground) between terminal "2" of the block of the wiring harness of the engine management system and terminal "M7" of the block of the ECU harness, as well as between terminal "1" of the block of the wiring harness of the engine control system and terminal "M64" of the block of the computer harness.
With good circuits and no voltage, the computer is faulty.
To test the air temperature sensor…
... with a tester we measure the resistance between its terminals at different values \u200b\u200bof the air temperature in the air supply hose to the throttle assembly (warm and cold engine).
At the same time, we measure the ambient air temperature in the hose next to the sensor with a thermometer.
The obtained resistance values are compared with the control ones (see table).
We replace the faulty air temperature sensor in the intake manifold with a new one together with the air supply hose to the throttle assembly.
Control values of the resistance of the air temperature sensor in the intake manifold (tentatively)
Air temperature,°С | Resistance, Ohm |
-10 | 16 000 |
0 | 9 400 |
10 | 5 700 |
20 | 3 500 |
40 | 1 500 |