Proheat X45–School Bus - Manual (Page 77)

PROHEAT INSTALLATION & SERVICE 5-20
Flame Sensor Test Procedure
Start Unit
Stop Unit
Disconnect
Sensor/Start Unit
Check Main Harness
for a Short Circuit/
Replace if necessary
Try with New PCM/
Replace if necessary
Check Flame Quality
Check Ignition
System
Page 5-15
Replace
Sensor
Replace
Sensor
Sensor
OK
Check main Harness
for Open Circuit/
Replace if necessary
Try with New PCM/
Replace if necessary/
After 60 Seconds if
there is a Start Error
go to Fuel System
Check Fuel
System
Page 5-27
Clean Sensor if necessary
and Restart
Disconnect Old
Sensor/Connect Test
Sensor/Hold up to
Inspection Port/Restart
Start Unit
Stop Unit
Disconnect
Sensor/Start Unit
Check Main Harness
for a Short Circuit/
Replace if necessary
Try with New PCM/
Replace if necessary
Is there
a Flame
Sensor Code?
Is there
a Flame?
Is there
a Spark?
Check Flame Quality
Check Ignition
System
page 5-13
Replace
Sensor
Replace
Sensor
Sensor
OK
Check main Harness
for Open Circuit/
Replace if necessary
Try with New PCM/
Replace if necessary/
After 60 Seconds if
there is a Start Error
go to Fuel System
Check Fuel
System
page 5-6
Clean Sensor if
necessary and Restart
Disconnect Old
Sensor/Connect Test
Sensor/Hold up to
Inspection Port/Restart
After 60
Seconds is there
a Start Code?
Is there
a Flame
Sensor Code?
After 60
Seconds is there
a Start Code?
Yes
Yes
Yes
Yes
No
Yes
1
2
1
2
1
2
Yes
No
No
No
No
No
Figure 5-18 Flame Sensor Test Procedure Flow Chart