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A constant idle speed is displayed if the speed signal strength is
sufficient:
– Accelerate engine to approx. 3000 rpm
A constant speed display must now be shown on the LCD
display.
5.3 Searching for the speed signal
i Do not move the speed sensor for approx. 2 - 3 s after
placement. The speed sensor needs this time to adjust to the
speed signal.
i 3-step setting switch for sensitivity:
Switch position –
Center position
Switch position +
If the speed signal is not strong enough:
– Place the speed sensor closer to the distributor, ignition cable
or ignition coil
– Rotate the speed sensor to the left or right by 90°
– Set the 3-step setting switch for sensitivity (7) to a higher
setting until a sufficiently strong speed signal is received (rapid
flashing of the speed signal LED).
5.4 Starting a new speed measurement
A new speed measurement is started by pressing the Repeat
key R (8).
6. Troubleshooting
– Speed signal LED (9) does not flash / no display
- Make sure that all connecting cables are connected correctly
- Check the power supply
– The connected engine diagnostic system does not indicate any
speed although an engine speed is shown on the LCD display.
- Make sure that the connecting cable is connected to the
correct terminal at the 12 V pulse output or
- Make sure that the trigger clamp-on pickup and inductive
coupling loop are connected correctly
- Make sure that the trigger clamp-on pickup closes properly
- No gap must be visible between the contact surfaces of the
ferrite core
- Carefully blow out metal chips on the ferrite core with oil-free
compressed air
- Remove oily residue on the contact surfaces of the ferrite
core with a clean soft cloth
Contact your Bosch after-sales service representative if this still
does not remedy the above faults and for any other faults.
18
lowest sensitivity
medium sensitivity
highest sensitivity
7. Technical data
Speed measuring range
Resolution
LCD display overflow
Signal output overflow
Number of cylinders
Engine types
12 V pulse output
Power supply
Display
8. Scope of delivery
The following components are included in the scope of delivery:
– Engine-speed measuring module ETT 223 (1)
– Inductive coupling loop (2)
– Plug-in power pack (3)
– Speed sensor (6)
– Retaining bracket (17)
– Ground cable (10)
– Operating instructions
9. Spare and wearing parts
Speed sensor
Retaining bracket
Plug-in power pack
Inductive coupling loop
Ground cable
Engine-speed measuring module
10. Warranty
No modifications must be made to our products; in addition, our
products must be used only with original parts. Non-observance
of the above will render all warranty claims invalid.
300 - 6000 rpm
10 rpm
–OL–
–OL–
–OL–
–OL–
–OL–
Number of pulses = 13 000 rpm
1, 2, 3, 4, 5, 6, 8, 10, 12
2 and 4 stroke engines
+12 V pulse voltage
Pulse duration 100 µs
1 pulse / 720° CS (crank shaft)
+12 V DC / 1 A with supplied plug-
in power pack 230 V/50 Hz
2-line LCD display
1st line: 16 characters
2nd line: bar display, 16 segments
1 687 224 858
1 681 321 276
1 687 022 475
1 684 447 033
1 684 447 034
1 687 023 240
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