Test Point 19 - Injection Valves
TEST POINT 19: - Injection valve (V/Ohms) - Fault code 1_51 for cyl. 1 to 1_56 for cyl.6Possible Causes, Elimination, Remarks
Drive link activation menu:
Each injection valve can be activated individually by means of the selective injection function. Opening of the injection valve can be heard only with extreme difficulty. (damped)
If no pulse can be heard, check:
a) Voltage supply
Disconnect valve plug, connect voltmeter with the valve plug terminal 2 and ground using test leads. Switch on ignition.
Display: Battery voltage
If no battery voltage is displayed, check current path in accordance with wiring diagram.
b) Check coil resistance of the injection valve.
Disconnect valve plug. Check the coil resistance at the terminal contacts of the injection valves with an ohmmeter.
Test value: 16 Ohms
c) Injection output stage
Adjust the oscilloscope in accordance with the manufacturer's instructions. Connect a Bosch test lead (1 684 463 093) between an injection valve and plug. Connect the tester lead with the test lead in accordance with manufacturer's instructions.
CAUTION: Tester leads must not have any contact with ground.
Start the engine. This display must appear at starter speed if the injection output stage is working perfectly and the test connections are correct.
NOTE: If the engine does not start or if the idle speed drops, change round tester connections to test lead and check tester adjustment.