NHTSA ID Number: 10130981
Manufacturer Communication Number: IK1900207
TSB/Document Date: 2018-04-02
Summary
HVAC Diagnostic Information
vary by several
tenths of a volt
higher or lower
than those
readings.
4. If the reading
are in spec but
the fault code
remains active ensure the
datalink has 60
ohms resistance
across it if ok go
to step 9, If you
get 120 ohms
you have an
open
somehwere in
the datalink or
you are missing
one of the
terminating
resistors.
5. If the readings
are out of spec
or missing
ensure the
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IK1900207 2010 and Later ProStar and LoneStar HVAC Diagnostic Information
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voltages on the
dataklink wires
do not match
(i.e. 2.5 volts)
the 2 wires may
be shorted
together or
reversed. Check
for harness
continuity
between the
Rear HVAC
connector 5210
pins 15 and 16
(J1939 datalink)
and the body
controller
connector 1602
pins F5 and F6.
Repair circuits if
open.
6. Make sure pins
are properly
seated and not
mis pinned. If
you have good
harness
continuity but
either datalink
voltage is out of
spec or or
missing ensure
the resistance to
ground is
greater than
10K ohms.
Check
resistance from
Rear
HVAC Controller
connector
5210 pins 15
and 16 to
ground,
resistance
should be
greater than
10K ohms. If
resistance is
less than 1,000
ohms you have
a short to
ground.
7. Ensure proper
datalink
voltages are
present at the
body controller
conenctor 1602
pins F5 and F6,
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if not then
replace the
body controller.
8. If the body
controller
datalink voltage
is correct and
the harness
tests passed yet
the fault still
exist go to step
9.
9. Check datalink
for any
customer
installed
equipment and
ensure it was
installed
properly. Refer
to the Body
Builder
Electrical
Guide HERE
General
Electrical
section for
proper
installation
information.
Ensure the
datalink pins are
NOT reversed.
10. If there are no
problems with
the customer
installed
equipment and
the fault still
exists replace
the Rear HVAC
controller
module.
Rear_HVAC_Blower_UP
N/A
3982
2
HVAC Rear
Blower Speed
Control Switch
Error
Faulty Switch
Actuator or Micro
switch for HVAC
Rear Blower Speed
Control Switch
Rear HVAC
Temperature
Control Switch
Error
Faulty Switch
Actuator or Micro
switch for Rear
HVAC Temperature
Control Switch
HVAC Control
Head Multiple
Motor Faults
HVAC Motor in
Wrong Position or
Jammed (HVAC
Rear_HVAC_Temp_UP
N/A
3983
2
HVAC Control Head Multiple Motor
Faults
N/A
520465
2
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Control Head
Multiple Motor fault
DM1)
Programmable Parameters
Below is the list of programmable parameters that control the operation of the HVAC system.
These are how the parameters are set from the factory for proper operation.
Parameter
ID
2562
2561
Parameter
HVAC_Compressor_HP_OFF_Time
HVAC_Compressor_HP_ON_Time
Value
9
1
Units
Description
Seconds
When AC Head pressure is
above 400 psi, the
compressor is cycled OFF for
9 seconds and ON for 1
second. This parameter is the
OFF time
Seconds
During high pressure mode
the AC Compressor is cycled
OFF and ON. This parameter
sets how long the compressor
is ON
2563
HVAC_Emergency_Shutdown_Pressure
420
PSI
Maximum AC Head Pressure
allowed before emergency
compressor shutdown. There
is a relief value that will
release the coolant into the
atmosphere if the head
pressure exceeds 500 - 530
psi. This value should be
somewhat less than that
(arbitrarily chose 480 psi)
Value will be typically the
same as parameter
'HVAC_Pressure_Over_Limit'
2551
HVAC_Freeze_Probe_High_Limit
505
A2Dcounts
High limit for Freeze Probe to
allow Compressor to operate
2542
HVAC_Freeze_Probe_Low_Limit
511
A2Dcounts
Low limit for Freeze Probe to
allow Compressor to operate
Seconds
When leaving High Pressure
Mode, this is the maximum
amount of time we can wait
for the pressure to drop below
300 psi before going to
Normal Operation
(Compressor ON) Mode
PSI
Maximum head pressure
allowable when turning the
compressor ON. (Transition
from Compressor OFF to
Normal Operation Mode)
2576
2548
HVAC_Leave_HiPressureMode_Timeout
HVAC_Max_Initial_Pressure
15
218
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IK1900207 2010 and Later ProStar and LoneStar HVAC Diagnostic Information
2546
HVAC_Pressure_High_Limit
350
PSI
2556
HVAC_Pressure_Low_Limit
35
PSI
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Maximum pressure where
HVAC Compressor can
operate
Low limit allowed to turn On
Compressor
A/C High Pressure Transducer Electrical Fault / Signal Table
This table outlines what the A/C pressure transducer signal reads if there is a electrical fault in the
system. The pressure readings may vary slightly.
Signal
B/C
Pin
Description
DLB Reading
AC_High_Side_Pressure
1600
-B12
Open circuit for air conditioning
high side pressure sensor wiring
on any wire, failed sensor, or short
to ground on the signal wire
6525.8 PSI. No fault code is
generated by this condition
AC_High_Side_Pressure
1600
-B12
Short circuit from air conditioning
high side pressure sensor feed(5
volts) to the sensor signal wire
530 PSI. Fault code 2609 16 HVAC
Pressure Protection is set. Fault
clears at key cycle
AC_High_Side_Pressure
1600
-B12
Short to power(12v) to air
conditioning high side pressure
sensor feed wire
1080 PSI. Fault code 2609 16 HVAC
Pressure Protection is set. Fault
clears at key cycle
Additional Resources
• IK0800092 - The First Check to make when Troubleshooting any Body Controller or ESC
Issue
• 0000002221 - Heat Ventilation Air Conditioning (HVAC) FOR 2010 ProStar and LoneStar
Models (Revision 1)
• 0000002122 - ProStar®+ and LoneStar® (EPA 10) - Electrical Circuit Diagrams Manual –
Models Built June 14, 2010 and After, Revision 4 (Supersedes S08344 and S08371)
• TSI1900001 - Air Conditioning (A/C) condenser replacement versus flushing
• IK1900156 - A/C HVAC Service Resource Center
• IK1900193 - Post 2010 A/C Pressure Transducer Diagnostics
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Copyright © 2014 Navistar
, Inc.
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TSB/Document ID: IK1900207
Replacement Service Bulletin Number:
MFR Communication Date: 2014-10-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:APPLIANCE:AIR CONDITIONER
MFR Component System:
MFR Component Subsystem:
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