Proheat M105 G-II PCM, Service Manual

Page: 64 / 90

4-27
PROHEAT M-SERIES G-II PCM SERVICE MANUAL
4.1.8
(7 Flashes)
4.1.7
(6 Flashes)
ci) G-II PCM —Locate and measure across pins C and E in the G-II PCM Data
Link connection. Perform this with the PROHEAT off and then switched on.
If the voltage is within the operating range and a Voltage diagnostic code is
indicated, the G-II PCM is faulty. Go to G-II PCM replacement, page 4-38
If the voltage falls below the required voltage when the Motor starts,
check the wiring from the supply source to the PROHEAT G-II PCM.
FLAME FAULT Diagnostic Code 6
Indicates that:
1. The PROHEAT reached 185°F (85°C) cycled off and entered Cool Down
(Purge). After 20 seconds a flame was still detected.
2. The PROHEAT was switched on and a flame (signal) was detected in
Pre-check.
Troubleshoot the Flame Fault diagnostic code based on:
1. Fuel Solenoid Valve mechanical fault. Go to page 4-29.
2. Glowing carbon deposits inside the combustion tube.
Go to page 5-2 and preform the complete annual maintenance procedure.
3. G-II PCM Flame Sensor circuit. Go to page 4-21.
TEMP SENSOR/COOLANT FLOW Diagnostic Code 7
The dual mode sensor contains both digital and analog sensing elements
and a diagnostic code 7 indicates the G-II PCM has detected one of four
possible faults with the dual mode sensor.
1. Coolant flow issue that causes a temperature reading mismatch between
the analog and digital temperature sensors.
2. Analog temperature sensor shorted.
Figure 4-28: G-II PCM Datalink Connection. (Illustration shows new G-II PCM.)
G-II PCM DATALINK
CONNECTION
G E F
B C
RED (+)
BLACK (-)