Socket pin numbers «10» on the relay and fuse box board
Checking the power supply voltage of the unit
1. Disconnect the connecting block with wires from the block.
2. Turn on the ignition and measure the voltage between the contacts «35» And «18», then between «35» And «9». The voltage should be about 12 V. Switch off the ignition.
3. On a vehicle with automatic transmission, connect a voltmeter to the terminals «9» And «32». Switch on the ignition and press the brake pedal. The voltage should be about 12 V. If the voltage is different, there may be an open in the wiring or the brake pedal position sensor is faulty.
Checking the output signal to the fuel pump relay
1. Remove the fuel pump relay from its socket in the relay and fuse box.
2. Connect a voltmeter to the contacts «46» And «47». Turn the crankshaft with a starter, the voltage should be about 9.5 V. Turn off the ignition. If the voltage differs from the specified, connect a voltmeter to the contact «46» And «mass» and turn on the ignition. The voltage should be about 12 V. If the voltage differs from the specified, then there is a break in the wiring.
3. Disconnect the connecting block with wires from the control unit.
4. Connect an ohmmeter to the contacts «47» and contact «21» control block pads. The device should show zero, otherwise the wiring is damaged. If the wiring is not damaged, the control unit is faulty and must be replaced.
Checking the output signal to the engine brake valve
(only on vehicles with manual transmission)
1. Warm up the engine, coolant temperature must be at least +50°С.
2. Disconnect the connecting block with wires from the valve.
3. Connect a voltmeter to the terminals of the block. Start the engine and spin it up to 2000 min-1. Close the throttle valve, the voltmeter should show a voltage of approximately 12 V.
4. If the voltmeter readings are different, you need to check the wiring from the control unit to the valve. To do this, connect an ohmmeter to the contact «2» valve pads (for cars manufactured before 1985, connect an ohmmeter to the contact «1») and contact «14».
5. The ohmmeter should show zero, otherwise the wiring is damaged. If the wiring is not broken, and the ohmmeter shows some resistance, replace the control unit.
Checking the output signal to the bypass valve
The test is carried out on a warm engine at a coolant temperature of at least +50°C.
1. Start the engine and let it idle.
2. Manually turn on the full throttle switch and listen for bypass valve operation.
3. If you do not hear the valve actuating, turn off the engine and disconnect the connecting block with wires from the valve.
4. Connect voltmeter to contacts «1» And «2». If the voltmeter shows a voltage of about 12 V, replace the valve. If the voltage differs from the specified, connect a voltmeter to the contact «2» And «mass».
5. Turn on the ignition, the voltmeter should show a voltage of 12 V, otherwise you need to check the wires going to the valve block. To do this, connect an ohmmeter to the contact «2» pads and to the contact «8» control block pads. The ohmmeter should show zero. If the ohmmeter shows infinity, there is an open in the wiring.
Checking the output signal of the control unit to the tachometer
1. Connect a voltmeter to the contact «7», by sliding the protective cover from the block of the control unit, since the block must be connected to the control unit and to «mass».
2. Connect control tachometer.
3. Start the engine, increase the speed to 2000 min-1. The voltmeter should show a voltage of about 1.3 V, otherwise replace the control unit. If the measured voltage is 1.3 V, but the vehicle tachometer readings do not match the reference tachometer readings, this means that either there is an open in the wiring from the contact «7» to the instrument panel, or the vehicle's tachometer is faulty.
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