c) Disconnect the Datalink harness at the PCM. Using a multimeter set for
voltage, measure across pins D and B in the PCM Datalink connection.
If voltage is read and it is of the correct value, the fuse is OK.
If voltage is not present, check the PCM fuse.
Procedure – PCM fuse replacement:
a) Disconnect all harnesses at the PCM.
b) Disconnect the fuel supply line.
c) Loosen and back out the burner head mounting (2) bolts five to six turns
allowing enough room to rotate the burner head 15° counter-clockwise
and remove.
d) Remove blower housing (2) screws and blower housing.
MOUNTING BOLTS (2) TORQUE = 100 in-lbs
COOLANT PUMP
SWITCH INPUT
TEMP SENSOR 1
POWER
FUEL INLET
PROHEAT M-SERIES SERVICE MANUAL
3-38
Figure 3-44: Burner Head Removal and Motor Mechanical Check
Figure 3-43: PCM Datalink Connection
PCM DATALINK CONNECTION
F
DE
A
CB
RED (+)
BLACK (-)
FUSE COVER AND FUSE
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