Fuel Solenoid Valve Diagnostic Code 8 - Proheat M50 G-II PCM Service Manual

WARNING
To avoid the risk of shock and to
ensure that the PROHEAT does not
fire, disconnect the Ignition Module
connector at the G-II PCM.
NOTICE
All plugs/harnesses must be rein-
stalled into the G-II Proheat Control
Module (G-II PCM) before heater
goes back into service.
MOUNTING BOLTS (2)
TORQUE = SEE SECTION 1.3
DUAL MODE TEMP
SENSOR
POWER
COOLANT PUMP
Figure 4-31: Burner Head Removal and Fuel Solenoid Valve Connection.
PROHEAT M-SERIES G-II PCM SERVICE MANUAL

FUEL SOLENOID VALVE Diagnostic Code 8

4.1.9
Indicates an electrical fault in the Fuel Solenoid Valve coil or in the G-II PCM
(8 Flashes)
Fuel Solenoid Valve circuit.
Troubleshoot the Fuel Solenoid Valve diagnostic code based on:
Fuel Solenoid Valve Coil or PROHEAT G-II PCM electrical.
Test Procedure – Fuel Solenoid Valve and G-II PCM test:
a) Disconnect all harnesses at the G-II 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 Solenoid Valve connector at the G-II PCM.
e) Inspect the G-II PCM connector for damage and corrosion. Inspect the
Fuel Solenoid valve harness and connector for damage and corrosion.
f) Measure the Fuel Solenoid Valve coil using a multimeter set to read Ohms.
If the coil measures between 35 and 45 Ohms, coil is OK, and if no damage
or corrosion is found in the G-II PCM connector or the Fuel Solenoid Valve
harness go to: G-II PCM replacement, page 4-38.
FUEL INLET
MOUNTING EARS (2)
SWITCH INPUT
4.1.10 NOT USED Diagnostic Code 9
(9 Flashes) This Diagnostic Code is NOT USED on the G-II PCM.
FUEL SOLENOID VALVE
CONNECTION
LOCK
4-29