NHTSA ID Number: 10167203
Manufacturer Communication Number: IK0800284
TSB/Document Date: 2019-11-05
Summary
Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Decision
Measure voltage between ambient temperature
sensor connector cavity A and GND
2
• SPEC: 5 +/- 0.5 Vdc
Yes: Go to step 3
No: Inspect wire from cluster 1501-9 to AAT sensor
pin A for open or short
Is voltage measurement in spec?
Step Action
Decision
Measure voltage between ambient temperature
sensor connector cavity A and cavity B
3
Yes: Go to step 2
Yes: Restore back to operational condition and
retest for fault code 171-3 or 171-4
• SPEC: 5 +/- 0.5 Vdc
No: Inspect ZVR wire from cluster 1500-8 to AAT
sensor pin B for open or short
Is voltage measurement in spec?
AAT Sensor Temperature VS. Resistance Chart
Figure 1
Temp
Temp R Nom
R Min
R Max
+/- (%) Tol Nom
-76F
-60C
1,410,910 1,267,349.9 1,554,470.1 10.175
-58F
-50C
671,960
611,483.6
732,436.4
9
-40F
-40C
336,000
310,464
361,536
7.6
-22F
-30C
177,000
165,185.3
188,814.8
6.675
-4F
-20C
97,060
91,382
102,738
5.85
14F
-10C
55,319
52,483.9
58,154.1
5.125
32F
0C
32,654
31,225.4
34,082.6
4.375
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Page 5 of 13
• Return to Troubleshooting Engine Sensor
• Return to Cluster Sensor Troubleshooting
( Return to Top )
Cluster Circuit Diagram(s)
IMPORTANT: Due to variations during vehicle production, be sure to select the most current wiring schematic manual, specific to the year
and model of the vehicle being serviced.
•
•
•
•
•
ProStar / LoneStar wiring for Cab Sensor
ProStar / LoneStar wiring for Cab Sensor with Front Axle Load Sensor
HPV wiring for Cab Sensor
HPV wiring for Cab Sensor with Front Axle Load Sensor
TerraStar wiring for Cab Sensor
The Cab Temperature Sensor is typically mounted near the front bumper or on the cooling package. If the sensor cannot be found verify the
wiring to the gauge cluster is present or that the outside air temp monitor feature as ordered on the truck.
Figure 2
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Page 6 of 13
Medium Duty Chassis Standard Mounting Location for Cluster Sensor
Figure 3
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Page 7 of 13
TerraStar Chassis only: The AAT sensor was relocated to the ABS ECU bracket May 2012
( Return to Top )
Sensor Location - Big Bore Engines
Big Bore Pre-SCR Engines and SCR Engine prior to August 2013:
The engine sensor is located on the left frame rail midway between the back of cab and front drive axle, or near the front drive axle. The
two photos below show both possible mounting locations (Figure 4 and Figure 5).
Figure 4
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
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Figure 5
Big Bore Post August 2013 build w/SCR engine, driver's side mirror head (Figure 6):
Figure 6
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Page 9 of 13
ISX15
and N13 Alternate Location (Figure 7):
Figure 7
ISX15 and N13 Alternate Location PayStar / 9900i (Figure 8):
Figure 8
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
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( Return to Top )
Sensor Location - Medium Duty Engines
N9/10 and ISB engine platforms moved the Engine AAT to the driver mirror on August 8, 2014 (Figure 9):
Figure 9
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Page 11 of 13
Location prior to August 8, 2014 on CE Bus
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( Return to Top )
Engine Sensor Circuit Diagram(s)
N13 ProStar built after May 2014
N13 ProStar built prior to May 2014 / MaxxForce 11/13
N13 PayStar / 9900i built after May 2014
N13 PayStar / 9900i built prior to May 2014 / MaxxForce 11/13
ISX15 ProStar built after May 2014
ISX15 ProStar built prior to May 2014
ISX15 PayStar / 9900i built after May 2014
ISX15 PayStar / 9900i built prior to May 2014
ISB built after May 2014
ISB built prior to May 2014
N9/N10 built after May 2014
N9/N10 built prior to May 2014
( Return to Top )
Warranty Coding / SRT
Warranty Claim Coding:
Group: 12000 - Engines
Noun: 160 - Sender, Ambient Temperature
Warranty Claim Coding:
Group: 08960 - Miscellaneous (Electrical)
Noun: 784 - Thermometer, Electronic
Standard Repair Time(s):
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Description
Chassis
1
Ambient Air Temperature Sensor, Replace
ProStar
1
Air Temperature Display Sensor, Replace
All Models
Engine
Cummins ISX
Page 13 of 13
SRT
Hours
R08-8160S
0.3
A08-3240
0.5
Claim SRT Example:
Claim Comment Suggestion:
Special Requirement(s):
( Return to Top )
Other Resource(s)
• IK0800369 - 2006-2009 Cummins Active Fault 249 / 256 Ambient Air Temperature Sensor 1 Circuit
( Return to Top )
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Copyright © 2019 Navistar, Inc.
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TSB/Document ID: IK0800284
Replacement Service Bulletin Number:
MFR Communication Date: 2019-10-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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