Subaru 2009 IMPREZA Service Manual page 138

6) Remove the nuts and bolts which hold the ECM
to the bracket.
7) Connect the probe to ECM connector.
7 6 5
17 16 15 14
27 26 25 24
34 33
(A) To ECM connector
Terminal No.
13
14
8) Start the engine and let it idle.
9) Check the pattern is as same as the waveform
and voltage shown below.
0
(A)
(A) One crankshaft rotation
Crankshaft Position Sensor
FU-03417
(A)
4 3 2 1
13 12 11 10 9 8
23 22 21 20 19 18
32 31 30 29 28
FU-04056
Probe
+
–
10ms
5V
FU-04057
FU(H4SO)-27
FUEL INJECTION (FUEL SYSTEMS)