NHTSA ID Number: 10167607
Manufacturer Communication Number: IK0800284
TSB/Document Date: 2019-11-12
Summary
Ambient Air Temperature (AAT) senor faults; only models with 2010 EPA MaxxForce 11, 13 engines.
IK0800284 - Ambient Air Temperature (AAT) senor faults
Page 1 of 4
Countries :
CANADA, UNITED STATES, MEXICO Document ID: IK0800284
Availability :
ISIS, FleetISIS
Revision:
2
Major System:
ELECTRICAL SYSTEM
Created:
5/16/2011
Current Language: English
Last Modified: 3/5/2013
Other Languages : Français, Español,
Author:
Viewed :
Will (Mark) Wiley
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Title: Ambient Air Temperature (AAT) senor faults
Applies To: 2010 EPA MaxxForce® 11 and 13 ProStar® and WorkStar®
DESCRIPTION
There are two ambient temperature sensors. The sensor located behind the cab along the left frame rail is the sensor the engine uses. There is
also a sensor located at the front of the chassis that the gauge cluster uses for the temp display. This article discusses the Engine
AAT Sensor first. Information on the Cab AAT can be found at the bottom of this article.
POSSIBLE DIAGNOSTIC TROUBLE CODES
SPN
171
171
171
FMI
4
3
2
MODULE
Engine
Engine
Engine
DESCRIPTION
AAT signal out of range LOW (Body mounted sensor)
AAT signal out of range HIGH (Body mounted sensor)
AAT signal does not agree with other sensors
LOCATION
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.
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IK0800284 - Ambient Air Temperature (AAT) senor faults
Page 2 of 4
ENGINE CIRCUIT DIAGRAM
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IK0800284 - Ambient Air Temperature (AAT) senor faults
Page 3 of 4
CAB AMBIENT TEMPERATURE SENSOR
The instrument cluster, connector
1501 pin 9, sends a 5-volt source to the temperature sensor. As the voltage goes across the temperature
sensor it decreases, the amount of voltage drop depends on outside temperature. The reduced voltage then returns to the instrument cluster on
pin 8 of connector 1500. The instrument cluster turns the received signal into to the temperature shown on the display.
CAB SENSOR TROUBLESHOOTING
Note: The Electronic Gage Cluster display will replace temperature reading with two dashes (- -) if a fault is present with the Ambient Temperature
Sensor circuit.
Step
Test Points
Specification
In Spec
NOT In Spec
1
Measure voltage between ambient temperature sensor
connector cavity A and GND
5 +/- 0.5 Vdc
Go to
next step
Inspect wire from cluster 1501-9 to AAT
sensor pin A for open or short
2
Measure voltage between ambient temperature sensor
connecotr cavity A and cavity B
5 +/- 0.5 Vdc
Go to
next step
Inspect ZVR wire from cluster 1500-8 to
AAT sensor pin B for open or short
Actual Ambient Temperature
Resistance value for sensor
50˚C (122˚F)
3557.7 - 3648.2 Ω OHMS
25˚C (77˚F)
9862.5 - 10137.5 Ω OHMS
0˚C (32˚F)
32197 - 33111 Ω OHMS
CAB CIRCUIT DIAGRAMS
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
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IK0800284 - Ambient Air Temperature (AAT) senor faults
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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.
OTHER RESOURCES
2006-2009 Cummins Ambient Air Temperature Sensor Location
2006-2009 Cummins Active Fault 249 / 256 Ambient Air Temperature Sensor 1 Circuit
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Copyright © 2013 Navistar, Inc.
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TSB/Document ID: IK0800284
Replacement Service Bulletin Number:
MFR Communication Date: 2013-03-05
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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