Test Point 24-27 - Injector valves
TEST POINT 24-27 - Injector valve - Fault code 1_51-1_54Possible Causes, Elimination, Remarks
- Using the System Tester 9288, the injector valves may be checked directly in the Drive links menu item or the Drive link active menu item.
Selective injection allows each injector valve to be actuated individually. In case of the Drive links test point, a rather weak switching noise of the injector valves is audible.
In case of the Drive link active menu item, each individual injector valve may be isolated with the engine running.
Power supply
- Disconnect valve plug, connect voltmeter to the injector valve plug terminal - refer to drawing - and ground (engine).
Ignition on. Display: Battery voltage.
If no battery voltage is displayed, check according to wiring diagram.
Checking coil resistance of injector valves -
- Disconnect valve plug. Check coil resistance at injector valve terminal contacts with an ohmmeter. Test value: approx. 16 Ohms
Injection output stage
- Adjust oscilloscope according to manufacturer's instructions. Connect a Bosch test lead (1 684 463 093) between injector valve and plug. Connect oscilloscope according to manufacturer's instructions with the test lead.
Caution: Make sure the tester leads are not grounded in any way.
ti signal:
- Start engine. If the injection output stage operates correctly or if the tester connections are correct, respectively. this signal must be displayed: