Section 5 – SR-2 Diagnostics
15 CHECK INTAKE AIR HEATER
Page 1 of 1
Alarm Type
Log, Check or Shutdown Alarm
Associated Alarm
Codes
Alarm Code 62
Component Description and Location
The intake air heater is located at the intake manifold.
Circuit Description
Power to the intake air heater is supplied by the H circuit. The associated interface board fuse is F5. Intake air
heater current is monitored by the Interface Board shunt.
How Alarm is Set
1. If the current draw is less than specified on an engine start, the alarm is set as a log alarm. Minimum
current on Yanmar 2.1 engines is 63 amps.
2. If the current draw is more than specified on an engine start, the alarm is set as a check alarm. Maximum
current on Yanmar 2.1 engines is 80 amps.
3. If the current draw is less than specified during a Pretrip Test, the alarm is set as a check alarm.
4. If the current draw is more than specified during a Pretrip Test, the alarm is set as a shutdown alarm.
How Alarm is Cleared
The alarm is cleared manually.
Diagnostic Procedure
1. Check the operation of the preheat circuit using Interface Board Test Mode. LED 3 should light. Current
draw should be approximately 70 amps.
2. If the current draw is less than 63 amps, be sure the battery is fully charged. Check the preheat circuit for
loose or corroded connections.
3. If the current draw is zero, check for an open heater or blown fuse F5.
4. If the current draw is in excess of 80 amps, check for a shorted heater.
5-25
02 February 2005
To Next Page
