Proheat M125 - Manual (Page 42)

START Diagnostic Code 1
Indicates that the G-II PCM Flame Sensor did not detect a flame or the flame
was too weak to be detected during the FULL 30 second ignition period.
Troubleshoot the Start diagnostic code based on the following symptoms:
1. Fuel System. This page, Steps 1 through 7.
a) There is no fuel, fuel odor or atomized fuel coming from the exhaust pipe.
b) There is no hot exhaust coming from the exhaust pipe.
2. Ignition System. Go to page 4-20.
a) There is raw fuel and/or atomized fuel and a raw fuel odor coming
from the exhaust pipe.
b) There is no hot exhaust coming from the exhaust pipe.
3. G-II PCM (PROHEAT Control Module) Flame Sensor circuit. Go to page 4-21.
a) There is a flame and the combustion sounds good, the PROHEAT
appears to be operating normally.
b) No smoke, raw fuel odor or atomized fuel is coming from the exhaust pipe.
4. Motor and/or G-II PCM fault. Go to page 4-32.
a) The Motor is NOT running. Ignition and Coolant Pump are operating.
b) No smoke, raw fuel odor or atomized fuel coming from the exhaust pipe.
4.1.2
(1 Flash)
NOTICE
After 10 consecutive start faults the
G-II PCM will go into Lockout Mode.
Power to the G-II PCM must be removed
and reapplied to exit Lockout mode.
Fuel and fuel supply – Check:
See Theory of Operation on page 2-4 for fuel system schematic and description.
a) Vehicle fuel level and/or for fuel gelling during cold weather.
b) Air leaks and/or restrictions in the fuel supply lines to the PROHEAT.
c) The PROHEAT operation when supplying fuel from a direct source.
Test Procedure – Supplying fuel from a remote source:
a) Remove the fuel supply line from the PROHEAT fuel inlet.
b) Using a length of fuel line connected from the PROHEAT fuel inlet to a
direct source of CLEAN fuel. Switch the PROHEAT on and operate for at
least one complete cycle. Observe the operation.
If the PROHEAT functions correctly, the fault is in the vehicle fuel system.
Check fuel lines, connections and routing back to fuel tank. Consult OEM
for service requirements.
If a Start diagnostic code is indicated, the problem is in the PROHEAT
fuel system. Proceed to Step 2.
START: Fuel System Step 1
(1 Flash)
Figure 4-2: Remote Fuel Supply.
FUEL INLET
NOTICE
When fuel system is open, the
PROHEAT will smoke and stumble
until the air is purged from the
system. It may be required to cycle
more than one time.
NOTICE
All plugs/harnesses must be rein-
stalled into the G-II Proheat Control
Module (G-II PCM) before the heater
goes back into service.
WARNING
Flammable liquid and vapours.
FUEL CONTAINER
4-5 PROHEAT M-SERIES G-II PCM SERVICE MANUAL