Proheat M80 - Manual (Page 40)

PROHEAT G-I PCM SERVICE MANUAL 4-9
e) Measure the Fuel Shut-off Valve coil using a multimeter set to read Ohms.
If the coil measures between 35 and 45 Ohms, coil is OK. Go to:
• Fuel Shut-off Valve output voltage measurement.
• Procedure – Fuel Shut-off Valve – Mechanical function.
If the coil measures open circuit, coil is faulty. Replace the Fuel Shut-off
Valve. Go to Fuel Shut-off Valve replacement, page 4-10.
Fuel Shut-off Valve output voltage measurement:
a) Reconnect the power, Temperature Sensor(s) and switch harnesses at
the G-I PCM.
b) Disconnect Ignition Module connector at the G-I PCM.
c) Switch the PROHEAT on and measure across pins A and B of the G-I PCM
Fuel Shut-off Valve connection.
If no voltage is measured, the G-I PCM is faulty. Go to G-I PCM replacement,
page 4-41.
If the correct voltage (9 – 15 V) is measured, the G-I PCM is OK. Go to
Procedure – Fuel Shut-off Valve – Mechanical function.
Procedure – Fuel Shut-off Valve – Mechanical function:
a) Using a flat head screwdriver hold the valve stem while loosening the coil
nut. Remove the coil.
Figure 4-11: G-I PCM Fuel Shut-off Valve Output Voltage Measurement
Figure 4-10: Coil Electrical Resistance Measurement
G-I PCM IGNITION
MODULE CONNECTION
A B
WARNING
Shock hazard due to high voltage.
WARNING
To avoid the risk of shock and to
ensure that the PROHEAT does not
fire, disconnect the Ignition Module
connector at the G-I PCM.
NOTICE
All PROHEAT external harnesses
must be connected to ensure that
the PROHEAT attempts to start
after Pre-check.
NOTICE
All plugs/harnesses must be rein-
stalled into the Proheat Control
Module (G-I PCM) before heater goes
back into service.