Make sure ECU and pump have good supply voltage (Min. 11.0 V). Make sure you have good fuel supply (fuel filter etc). Check MVB 018 block 3. Data below shows what to expect...

018 Injection pump
1) Injection pump supply voltage
[V]

2) Engine control unit supply voltage
[V]

3) Pump status word
0 0 0 0 0 0 0 0 No fault detected
X X X X X X X 1 Continuous current to quantity adjuster solenoid valve
X X X X X X 1 X Quantity adjuster solenoid valve defective
X X X X X 1 X X Injection pump speed sender defective
X X X X 1 X X X Injection timing defective
X X X 1 X X X X Commencement of injection not detected
X X 1 X X X X X Shut-off signal set
X 1 X X X X X X Engine speed not detected
1 X X X X X X X CAN bus data wire defective

4) Evaluation of engine speed sender pulses
0 0 0 0 One pulse outside, one pulse inside segment
X X X 1 No pulses outside segment
X X 1 X Several pulses outside segment
X 1 X X No pulses inside segment
1 X X X Several pulses inside segment

But the test plan basically states that the valve is part of the pump and if it's faulty you have to change the whole assembly. Also, these later ones have to be adapted to immo. HTH.

Matt