Car gasoline injection system Volkswagen Passat B3

General information about the injection system
The advantages of gasoline injection systems over carburetors are as follows: Precisely dosed amount of fuel at each load mode, resulting in low fuel consumption and good power...

Exhaust gas toxicity control
Since 1/12/93, regular exhaust gas toxicity testing has been introduced in Germany for vehicles equipped with regulated catalytic converters and diesel engines. The testing must...

Safety precautions when working with injection systems
Do not start the engine if the battery is not securely connected. The ignition and injection system wires must be disconnected and connected only when the ignition is switched...

Mono-Jetronic injection system
1 — control unit 2 - plug connector For actuator motor and throttle position sensor. 3 - end damper For the throttle valve. 4 - plug connector For valve injector and intake air...

Querying the memory device for fault codes
Mono-Jetronic, Mono-Motronic up to 9/93 The electronics of the control unit allow faults in the injection system to be detected. After the first occurrence of faults, their codes...

Checking idle speed and CO content
Mono-Jetronic, engines with the designation RP, IF Mono-Motronic, engines with the designation RP, AAM, ABS, ADZ Note: Idle speed and CO content must be checked together. Both...

Checking the injector valves / idle switch
Mono-Jetronic, Mono-Motronic If the engine does not start, you should always first check whether the injector is injecting fuel at all and whether there is an ignition spark. The...

Checking the throttle potentiometer
Mono-Jetronic The potentiometer transmits information about the throttle position to the control unit. The control unit uses this information to control the operation of the valve...

Checking the oxygen sensor
Mono-Jetronic A malfunction in the oxygen sensor adjustment is checked by interrogating the memory device for malfunction codes. Interrogate the memory device. If the code 2 3 4 2...

Checking the temperature sensor
Mono-Jetronic, Mono-Motronic, Digifant, Motronic The Mono-Jetronic system, unlike the Digifant system, has 2 different temperature sensors. The intake air temperature sensor is...

Checking the intake manifold heating system
Mono-Jetronic, Mono-Motronic To improve the dynamic properties during engine warm-up, an electric heater is installed in the intake manifold. The heater heats up in a matter of...

Electrical test of the Mono-Jetronic injection system
This manual allows you to electrically test individual components and wiring of the Mono-Jetronic system. Before checking, it is recommended to interrogate the memory device for...

Injection system Digifant / Simos
1 - air filter 2 - knock sensor 3 - air flow meter 4 — CO content adjustment screw 5 - inlet hose 6 - pressure regulator 7 — TSZ-H system switch 8 — Digifant system control unit 9...

Checking/adjusting idle speed and CO content Digifant
Digifant injection system, engines with designations ABF, PF, PB, PG, 2E Caution: Idle speed, CO content and ignition timing must be checked and adjusted together. In engines with...

Checking the regulation of the oxygen sensor Digifant
Digifant injection system with adjustable catalyst (engines PF, PG and 2E up to 7/92) Prerequisite for checking: The exhaust system between the catalytic converter and the engine...

Checking the Idle Speed Increase Valve Digifant
Digifant The valve prevents the idle speed from dropping too much when the load increases, such as when many electrical consumers are switched on. This prevents the engine from...

Checking the forced idle and enrichment switch with the throttle fully open
Digifant injection system (engines with designations PF, PG) Increased fuel consumption and poor engine throttle response may be caused by insufficient enrichment of the mixture...

Removal and installation / checking of Digifant/Simos valve injectors
Note: With the Digifant system, the supply voltage and resistance for all valve injectors are checked at the common connector. With the Simos system, the check is performed for...
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Simos injection system since 10/94
1 - fuel distributor 2 — bolt M6, 10 Nm; bolt M8, 20 Nm 3 - locking bracket 4 - sealing ring 5 — fuel pressure regulator 6 - valve injector 7 — valve nozzle glass 8 - to the brake...

Electrical test of the Digifant injection system
According to this manual, it is possible to check the individual components and wiring of the Mono-Jetronic system electrically. Before checking, it is recommended to interrogate...

K-Jetronic injection system
1 - throttle position sensor 2 — TSZ-H switch 3 — throttle valve pipe 4 — VEZ control unit 5 — ignition distributor 6 - ignition coil 7 — control unit for the engine idle speed...

KE-Motronic injection system
1 — KE-Motronic system control unit 2 — throttle position sensor 3 — throttle valve pipe 4 — CO sampling tube 5 — plug connector for oxygen sensor. 6 — control valve of the engine...

Checking/adjusting idle speed and CO content K-Jetronic
K-Jetronic, engine with the designation KR Note: For engines with the KE-Motronic system, designated 9A, the idle speed is only checked, but not adjusted. In addition, before...

Checking the stabilization of the engine speed at idle speed K-Jetronic
K-Jetronic. Functional check Turn on the ignition and check if the control valve buzzes and vibrates. If so, then perform a control check. Otherwise, disconnect the control valve...

Checking the K-Jetronic Idle Switch
Warm up the engine until the oil temperature is at least +60°C. Check the vacuum hose to the idle speed switch valve for porosity and cracks; replace the hose if necessary. Start...

Checking the temperature sensor K-Jetronic, KE-Motronic
The temperature sensor is located on the left side of the cylinder head and measures the coolant temperature. A faulty temperature sensor causes problems when starting a cold...

Checking and adjusting the position of the K-Jetronic, KE-Motronic flow meter flap
The air flow meter flap deflects to a greater or lesser extent depending on the amount of air entering the engine. If the flap rest position is too low, the engine cannot be...

Checking the control lever and the distribution piston K-Jetronic, KE-Motronic
The intake air flow passes through the diffuser and deflects the flow meter flap. The flow meter flap, in turn, acts on the fuel metering piston via the control lever. The piston...

Removal and installation the fuel starter valve / K-Jetronic thermostat
When the starter of a cold engine is turned on, the fuel starter valve injects additional fuel into the intake manifold. A faulty starting valve causes difficulty starting the...

Motronic injection system
AEK 1.6L and 6-cylinder engine The Motronic system from BOSCH is a combined ignition and injection system with a single control unit. In this chapter I would like to focus mainly...

Prescribed CO content values
Caution: Fulfil the adjustment conditions. The engine letter designation is stamped on the left side of the cylinder block. For ignition timing values, see Chapter " Ignition...

Removal and installation / inspection of K-Jetronic valve injectors
Valve injectors inject fuel continuously before the intake valves. The amount of fuel injected is regulated by the fuel pressure. The valve injector injects fuel in a cone-shaped...

Checking/removing and installing the fuel pump
The fuel pump is located together with the fuel level indicator sensor in the fuel tank. The K-Jetronic injection system has an additional fuel pump under the body next to the...

Checking the fuel pump relay
The fuel pump relay test should only be performed if the fuel pump is not working. Check fuse #18 of the fuel pump, replace the fuse if necessary. Remove the fuel pump relay at...

Adjusting the gas thrust
Note: Only applies to vehicles with a manual transmission: for automatic transmission, see chapter " Automatic transmission ". Ask your assistant to fully depress the gas pedal....

Checking the intake air heating
Digifant, K-Jetronic, KE-Motronic (Mono-Jetronic see above) The intake air heating is regulated by the air damper in the air filter box depending on the load and temperature. The...

Replacing the air filter
The picture shows the engine air filter with the Digifant system 1 - Replacement air filter element 2 - upper part of the air filter housing 3 - Hexagon head bolt, 5 Nm 4 -...

Diagnostics of faults of injection systems K-Jetromic / Digifant
Before detecting a fault based on diagnostics, the following prerequisites must be met: Conditions for the occurrence of errors during starting are excluded. This applies to both...

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