Proheat M125 - Manual (Page 63)

VOLTAGE: Step 2
(5 Flashes)
VOLTAGE Diagnostic Code 5
Indicates that the supply voltage to the G-II PCM is outside the operating
range for more then 10 seconds.
Operating Range:
• 12 volt PROHEAT – 10 to 16 volts.
• 24 volt PROHEAT – 18 to 32 volts.
Troubleshoot the Voltage diagnostic code based on:
1. Low voltage.
• Voltage supply is below the rated requirement.
• Poor or faulty electrical connections.
• Voltage supply source is OK. Voltage drop due to high amperage load
while the PROHEAT is operating or trying to operate.
2. High voltage.
• Voltage supply is above the rated requirement while the vehicle
engine is running.
High Voltage – Check:
The vehicle charging system. Consult the OEM for service requirements.
Low Voltage – Check:
a) System voltage supply source.
b) Wiring harnesses and connection points.
Procedure – Low voltage testing:
a) Inspect the wiring harnesses and connections for corrosion and proper
fit. Clean if necessary.
b) Using a multimeter set for voltage, measure across the positive and
negative battery terminals or at the supply source.
If the voltage is below the required voltage, service the batteries and/or
charging system as per OEM supplier recommendations.
If the voltage level is within the operating range, go to item 'c'.
4.1.6
(5 Flashes)
VOLTAGE: Step 1
(5 Flashes)
Figure 4-27: Voltage Measurement.
TO PROHEAT
4-26 PROHEAT M-SERIES G-II PCM SERVICE MANUAL