Troubleshooting D-Jetronik
1.Engine will not start, K-pump is not running.
Swap check and restore voltage to pump, if necessary. Pump. ECU defekt.
2.Engine does not start, pump runs.
3.Engine starts cold and goes out again.
4.Engine dies during the journey from (previously dead) trip contact of high resistance, possibly soiled.
5.Evil motor running, a cylinder is not working, white flag of exhaust.
6.Engine Dropout (ignition OK).
7.No performance fuel pressure low.
8.High fuel consumption.
9.Strong saws idle.
10.Engine is when accelerating from (slippers).
11.Rough idle when engine is warm.
12.Idle can not be adjusted (Speed too low)
13.Dropouts during idling and during acceleration.
14.Easy jerking while driving.
15.Dropouts in the partial load.
16.Dropouts between 3000-4500 in order. / min.
17.CO setting over 1% or 4% not possible.
18.In hot engine and no power saws idle.
19.About 4000 To. / Min. Dropouts.
20.In the push mode Flames beat from the exhaust.
Footnotes
1: To observe the display better, it is advisable to rotate the crankshaft by hand. Due to the inertia of some devices, it is not always possible to measure accurately. One can help but by pin 12 sets the control module connector at 11,
a diode test lamp does and this connects to pin 16 and to pin 21 or pin 22.
Upon startup, the diode will then flash, or commute the display.
2: accelerator pass through slowly. The display is 10x commute between 0
and OL. When you release the value in OL remains. If not, the switch is faulty.
3: throttle in idle = 0 ohms, with deflection greater than 1 ° (about 0.4-0.5mm) = OL
4: In case of parallel valves pull the other plug to measure only one valve may or share the setpoint for a valve by the number of connected valves.
OL means Open line or infinite OHM.
Notes: The two temperature sensors are NTC. This means that their resistance decreases with increasing heat. The value of the cooling water temperature sensor at operating
Therefore temperature is about 300-500 ohms. For measurements on this component, it is useful to have a comparison value only at the sensor and then to measure the control unit connector and can track resistances. (Measurement at the component with the plug disconnected!)
a diode test lamp does and this connects to pin 16 and to pin 21 or pin 22.
Upon startup, the diode will then flash, or commute the display.
2: accelerator pass through slowly. The display is 10x commute between 0
and OL. When you release the value in OL remains. If not, the switch is faulty.
3: throttle in idle = 0 ohms, with deflection greater than 1 ° (about 0.4-0.5mm) = OL
4: In case of parallel valves pull the other plug to measure only one valve may or share the setpoint for a valve by the number of connected valves.
OL means Open line or infinite OHM.
Notes: The two temperature sensors are NTC. This means that their resistance decreases with increasing heat. The value of the cooling water temperature sensor at operating
Therefore temperature is about 300-500 ohms. For measurements on this component, it is useful to have a comparison value only at the sensor and then to measure the control unit connector and can track resistances. (Measurement at the component with the plug disconnected!)
Impressions
Peter Hemmersbach repairs defective D-Jetronik control units in his workshop.
The D-Jetronik injection was real "high-tech" in the late 60s and it took over the place of mechanically controlled injection systems in many top models.
A classic car can even today be a very reliable vehicle. It is important to take good care of the technique and to have a little interest in the topic.
