• The degree of throttle opening depends on the coolant temperature (low when warming up, high when cooling).
(3) Fault code Off
• If the seal between the cylinder head and the 3-way catalytic converter is not well enough, air can enter the engine during
operation, which can lead to a mixture imbalance and reduce the efficiency of the catalytic converter.
550-950 mV
• Adjust the throttle cable and accelerator pedal adjusting screw to ensure full throttle opening.
Check objects
• The canister purge tube must be present and installed in the correct position because
0-99.6%
• The fuel pump turns on for 1.5 seconds each time the ignition is turned on. This is necessary to fill the fuel lines with fuel, since
there is no fuel in the fuel lines when the ignition is off.
• The intake manifold absolute pressure sensor reading must match the actual value.
(2) Ignition off
• Reduce the fuel supply, shift into direct gear and maintain a speed of 80 km/h for at least
• The inlet and outlet pipes of the low pressure fuel pump must be installed in their places; a compensation vacuum tube of the
pressure regulator must be installed, since its absence can lead to an increase in harmful emissions and fuel consumption;
(4) Coolant temperature (5) Battery terminal
voltage (6) Absolute air pressure sensor
reading
4. Description
spirit in the intake manifold
(b) Settings when initializing systems
(1) Turn on the ignition but do not start the engine
• The upstream oxygen sensor signal voltage should be between 100-900 mV and be updated more than 6 times every 10 seconds
(after the oxygen sensor has warmed up to over 80°C at idle);
(3) Starter start
(1) While driving, the following checks should be made:
13.5-14.5 V
• An insecure connection in the connectors may cause an incorrect signal to be registered and control failure.
(2) Engine Malfunction Indicator Lamp Off
(8) Oxygen sensor signal
its absence can cause an increase in idle speed;
atmospheric pressure;
less than 5 s.
(7) Throttle position sensor operating range
• The process for checking the high pressure fuel line is described in the component introduction section and in the section on
troubleshooting common fuel system problems;
• Warning lamp comes on but no fault code is stored
• If there are problems starting the starter, check the components of the fuel system, the ignition system and the condition of the
related connections, and also make sure that the initialization operation is completed, that there is fuel in the fuel lines, that the
fuel lines are not blocked;
• Throttle open more than 10% for more than 15 seconds;
20 kPa
leniya;
(c) Checking the status of systems and vehicle
• Turn off the ignition if a throttle malfunction is detected and the power to the engine control unit is turned off; check if the power
cable of the engine control unit is mistakenly connected to the ignition switch, which can make it difficult to start the starter and
lead to an increase in harmful emissions.
(f) Step 6: Check while driving
80-94°C
(a) Regular check
• The engine control unit is always initialized when first switched on and switched off after installation;
184
4C20 Gasoline Engine Repair Manual
Machine Translated by Google
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