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 3-10.
Fuel Shut-off Valve output voltage measurement:
a) Reconnect the power, Temperature Sensor(s) and switch harnesses at
the PCM.
b) Disconnect Ignition Module connector at the PCM.
c) Switch the PROHEAT on and measure across pins A and B of the PCM
Fuel Shut-off Valve connection.
If no voltage is measured, the PCM is faulty. Go to PCM replacement,
page 3-39.
If the correct voltage (10 – 15V for 12V system or 20 – 30V for 24V
system) is measured, the 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.
PROHEAT M-SERIES SERVICE MANUAL
3-9
Figure 3-9: PCM Fuel Shut-off Valve Output Voltage Measurement
Figure 3-8: Coil Electrical Resistance Measurement
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 PCM.
NOTICE
All PROHEAT external harnesses
must be connected to ensure that
the PROHEAT attempts to start
after Pre-check.
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