Power check
Check fuel pump fuse. K-Jetronic: fuse #13, KE-Jetromc: fuse #13 and 24.
Disconnect the high voltage wire - terminal 4 on the ignition distributor (central cable) and short it to ground, if necessary, use an auxiliary cable with the same cross section.
Turn on the starter for a short time, the fuel pump should work (make a noise).
Otherwise connect auxiliary control.
Press the auxiliary control button. If the fuel pump now starts, check the fuel pump relay.
Otherwise, unscrew the fuel pump electrical wires and connect a voltage indicator. Press the remote control button, the LED should light up, otherwise determine the location of the wire break according to the diagram and eliminate the malfunction.
If voltage is present, replace the fuel pump.
Connect the electrical wire to the fuel pump.
Performance check
Connect a voltmeter to the fuel pump. Press the auxiliary control button, take the voltage reading and record it as X value.
To relieve pressure, briefly remove the fuel tank cap.
Disconnect the fuel return line and lower it into a measuring vessel.
Turn on the pump for 30 seconds and measure the volume of fuel.
Coupe
Limousine (Sedan)
For the recorded voltage value X, determine the minimum allowable performance Y from the diagram. Example: Voltage value X=10.2 V corresponds to delivery volume Y=505 cm3.
Compare the minimum allowable performance with the actually measured one.
Caution: If the voltage is normal and the output is too low, replace the fuel pump.
Check the high voltage wire to the ignition distributor.
Checking the fuel pump relay
The fuel pump relay should be checked if the fuel pump is not working.
Remove the fuel pump relay (nest number 10).
K-Jetronic and 90 hp engine with KE-Jetronic
Disconnect the Hall sensor connector on the ignition distributor by pressing the wire clip.
Switch on the ignition v measure the voltage between the following terminals: 48 and ground; 48 and 50; 46 and 50. Should be: 12 V (battery voltage). If necessary, find a break in the wires according to the diagram and eliminate the malfunction.
Connect a voltmeter between terminals 51 and 50. Battery voltage should be (12 V).
Momentarily short the center wire at the Hall sensor connector to ground with an auxiliary wire. The voltage should drop for a short time. In this case, replace the fuel pump relay or check the hall sensor/switch TSZ-H.
Otherwise, find and fix a wire break according to the diagram
Engines 113, 115, 136 hp with KE-Jetronic
Turn on the ignition and check the voltage between the following contacts: 48 and ground, 46 and ground. The probe LED should light up. If necessary, detect and repair a broken wire according to the diagram.
Switch off the ignition.
Connect a voltage tester between terminals 46 and 47.
Turn on the ignition. The LED should light up for 1 second.
Otherwise, find a wire break to the VEZ control device according to the diagram and eliminate the malfunction.
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