Fuel injection «Mono-Jetronic» car Volkswagen Passat B4

Central fuel injection system «MONO-JETRONIC»
Cars with the "RP" engine manufactured before January 1993 are equipped with a central air conditioning system (single point) fuel injection (CI) "Mono-Jetronic" by Bosch. This...

Checking and adjusting the fuel injection system «MONO-JETRONIC»
To check and adjust the injection system "Mono-Jetronic" to avoid injury and damage to system components, you must follow these rules. Do not operate the engine if the wire clamps...

Fuel pump
To remove, disconnect the wires from the battery. Lift the luggage compartment carpet and remove the inspection hatch in the body floor. Disconnect the electrical wiring...

System self-diagnosis
Electronic SCV "Mono-Jetronic" has a self-diagnostic system. The injection system ECU includes a read-only memory (ROM) that detects, stores and indicates some system faults that...

Checking the electrical circuits of the system
The injection system circuits and devices can be checked through the terminals (Fig. 2-71) of the ECU connector according to the given table 2-11. The check is performed with a...

Checking the engine idle speed
The engine idle speed is checked on a warmed-up engine (oil temperature not less than 80°C), with a working exhaust gas oxygen concentration sensor, with correctly adjusted gaps...

Checking and adjusting the throttle valve opening
Disconnect the idle speed control valve connector "A" (Fig. 2-57). Apply a constant voltage of no more than 6 V to the idle speed controller by connecting the positive terminal of...

Checking the idle speed control valve
Disconnect the idle speed control valve connector (Fig. 2-57). Connect an ohmmeter to terminals "1" and "2" of the regulator block. The resistance should be within 4-200 Ohms....

Checking the ignition retard control valve
Turn on the ignition. Open and close the throttle valve. You should hear a click twice in valve 1 (Fig. 2-58) of the ignition delay control. If there are no clicks, disconnect the...

Checking the fuel pressure regulator
Disconnect the fuel supply hose (black color) from the central injection unit branch pipe. Connect the pressure gauge to the central injection unit pipe and to the fuel supply...

Checking the throttle position sensor
Disconnect the throttle position sensor connector (Fig. 2-60). When measuring the resistance between the terminals, it should be: terminals "1" and "5" - 520-1300 Ohm; terminals...

Checking the coolant temperature sensor
Disconnect the sensor connector (blue color) (Fig. 2-61), connect the ohmmeter to the terminals of the sensor block and check that the ohmmeter readings correspond to the...

Checking the incoming air temperature sensor
Disconnect the connector of the central injection unit of the flap (Fig. 2-62), connect the ohmmeter to the terminals of the unit block. The relationship between the temperature...

Checking the injector
Start the engine and warm it up to normal operating temperature. Stop the engine. Disconnect the air supply hose from the central injection unit housing and remove the central...

Checking the injector ballast resistor
Disconnect the resistor connector (Fig. 2-63), connect an ohmmeter to the terminals of the resistor block and make sure that the resistance value of the resistor is within 3-4...

Checking the oxygen sensor in the exhaust gases
Note: Vehicles with a catalytic converter have an oxygen sensor with slots in the receiver head (sensor 1). The oxygen sensor of vehicles without a catalytic converter has a head...

Checking the intake manifold heater
Disconnect the heater wire connector (Fig. 2-66). Connect an ohmmeter to the block and ground and check the resistance, which should be within 0.25-0.50 Ohm.

Checking the throttle damper
Open the throttle valve. Make sure that when the throttle valve is closed, the damper rod 2 enters its housing under the action of lever 1 (Fig. 2-67). Check the gap between lever...

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