Fuel Shut-Off Valve Diagnostic Code - Proheat M80 Service Manual

WARNING
NEVER remove coolant lines when
the engine is hot – escaping steam
or scalding water could cause
serious personal injury. Loosen the
coolant line clamps slowly,
allowing the pressure to escape
before removing completely.
WARNING
To avoid the risk of shock and to
ensure that the PROHEAT does not
fire, disconnect the Ignition Module
connector at the PCM.
MOUNTING BOLTS (2)
TORQUE = 100 in-lbs
TEMP SENSOR 1
POWER
COOLANT PUMP
Figure 3-37: Burner Head Removal and Fuel Shut-off Valve Connection
PROHEAT M-SERIES SERVICE MANUAL
Temperature Sensor replacement:
a) Isolate the coolant system at the PROHEAT inlet and outlet ports for mini-
mal coolant loss using valves in the system or hose clamps.
b) Remove sensor using a 14 mm wrench.
c) Reinstall the new sensor. Ensure that the O-ring and O-ring seat are
clean. Install the sensor until it bottoms out on the mounting boss.
3.1.8

FUEL SHUT-OFF VALVE Diagnostic Code

(8 Flashes) Indicates an electrical fault in the Fuel Shut-off Valve coil or in the PCM Fuel
Shut-off Valve circuit.
Troubleshoot the Fuel Shut-off Valve diagnostic code based on:
Fuel Shut-off Valve Coil or PROHEAT PCM electrical.
Test Procedure – Fuel Shut-off Valve and PCM test:
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) Disconnect the Fuel Shut-off Valve connector at the PCM.
e) Disconnect the Ignition Module connector at the PCM
f) Reconnect the power, Temperature Sensor(s) and switch harnesses at
the PCM.
g) Switch the PROHEAT on:
If a Fuel Shut-off Valve diagnostic code is NOT indicated and the
PROHEAT attempts to operate, the Fuel Shut-off Valve is faulty.
Go to Fuel Shut-off Valve replacement, page 3-10.
If the Fuel Shut-off Valve diagnostic code is still indicated, the PCM is
faulty.
FUEL INLET
MOUNTING EARS (2)
SWITCH INPUT
Go to PCM replacement, page 3-39.
FUEL SHUT-OFF VALVE
CONNECTION
LOCK
3-31