Proheat M125 - Manual (Page 38)

TROUBLESHOOTING
AND REPAIR 4.0
Problems with the PROHEAT and its operation will be indicated in two ways:
1. PROHEAT Diagnostic Faults indicated by means of a flashing diagnostic code
on the G-II PCM and a OEM indicator light (if equipped). Go to page 4-3.
2. Operational problems may not be identified with a flashing diagnostic code
(e.g., blown fuse, obstructed coolant flow, air leaks in fuel supply line).
Go to page 4-39.
Troubleshooting a Problem
Locate the PROHEAT, remove the enclosure lid if used and visually check for
any problems with wiring harnesses, fuel leaks, coolant leaks, exhaust pipe
damage and environmental condition.
Check the diagnostic indicator light, and if it's flashing, determine the code
based on page 4-3.
If no code is indicated, turn the PROHEAT off and then on again using the
existing operational switches, timer or a PROHEAT remote start switch
(PROHEAT P/N PK0091).
Let the PROHEAT attempt to start and/or operate. Observe the operation.
NOTE: The PROHEAT will always attempt to start twice, as long as the coolant
temperature is below 160°F (71°C). If a fault is detected it will shut down, go
through a Cool Down (Purge) and attempt a second start. After both attempts
to start or operate, an indicator light will flash a diagnostic code.
Go to page 4-3.
• If the indicator light flashes, count the number of flashes and refer to
the troubleshooting diagnostic code description for that number on the
following pages.
• If the PROHEAT runs but is not performing or operating correctly, consult
the Operational Problems section, page 4-39.
Troubleshooting and Repair Tools Required
• Test Gauge, Air Pressure Digital Manometer (PROHEAT P/N PK0036)
Allows the service technician to check the air compressor pressure to
ensure correct fuel delivery.
• Remote Start Switch (PROHEAT P/N PK0091)
Allows the service technician to work at the PROHEAT. Isolates the
PROHEAT from the existing vehicle system controls and comes with a
built-in indicator light.
• Temperature Sensor (PROHEAT P/N P/N 200304K G-II PCM)
Allows the service technician to start a PROHEAT when the coolant
temperature is greater than 160°F (71°C). To be used only for
troubleshooting.
• Test Gauge, Air/Fuel Pressure (PROHEAT P/N PK0067)
Allows the service technician to check the fuel pressure to ensure correct
fuel delivery (can also be used for air pressure measurements).
• Test Gauge Adaptor (PROHEAT P/N PK0071)
Rotary Vane Compressor Models ONLY (SN 600000 to 699999)
Allows the service technician to measure the air compressor pressure and
adjust the air relief at the same time.
STEP 1
STEP 2
STEP 3
STEP 4
4-1 PROHEAT M-SERIES G-II PCM SERVICE MANUAL