IK0800284 Service Bulletin/Repair Instructions

IK0800284 ­ Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
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IK0800284
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4/15/2014

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Title : Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics

Applies To : 2010 EPA MaxxForce® 11 and 13 ProStar® and WorkStar®
CONTENT MENU

Click on the items below to jump to each section:

ENGINE DIAGNOSTIC TROUBLE CODES

SENSOR LOCATION

ENGINE CIRCUIT DIAGRAM

CAB AMBIENT TEMPERATURE SENSOR

AAT SENSOR TEMP VS. RESISTANCE CHART

CLUSTER CIRCUIT DIAGRAMS

OTHER RESOURCES

WARRANTY CODING/SRT
ENGINE DIAGNOSTIC TROUBLE CODES

There are two ambient temperature sensors. The sensor located behind the cab along the left frame rail is the sensor the engine uses. To

confirm this, unplug the sensor and observe the cluster LCD display, it the reading stays the same, the correct sensor is unplugged. There is

also a sensor located at the front of the chassis that the gauge cluster uses for the temp display.

This article begins and discusses the Engine AAT Sensor, prior to and first. After August 23, 2013, Some SCR engines have the Engine AAT

sensor mounted in the driver side mirror head and alternatively the sensor could be mounted to the horn bracket. The location depends on build

date.

SPN FMI Module Description

171 4
Engine
AAT signal out of range LOW
171 3
Engine
AAT signal out of range HIGH
171 2
Engine
AAT signal does not agree with other sensors
CIRCUIT DIAGNOSTICS

NOTE: If the ECM is setting/logging code 171 2 and the sensor tests good DO NOT replace the sensor, there is a new calibration available as

of March 7, 2014 for EGR engines, and coming in June 2014 for SCR engines to address this issue.
SENSOR LOCATION

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 1 and Figure 2).
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IK0800284 ­ Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Page 2 of 5
Figure 1
Figure 2
Post August 2013 build w/SCR engine, driver's side mirror head (Figure 3):
Figure 3
ISX and N13 Alternate Location (Figure 4):
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IK0800284 ­ Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Page 3 of 5
Figure 4
ENGINE CIRCUIT DIAGRAM

Pre SCR engine or SCR Pre August 2013 build date (Figure 5):
Figure 5
Click HERE for the Wiring Schematic for the W/SCR and post August 2013 build date(N13/ISX)
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.

NOTE: The Electronic Gage Cluster display will replace temperature reading with two dashes (- -) if a fault is present with the Ambient

Temperature Sensor circuit.

SPN FMI Module Description

171 3
Cluster
Fault on Analog Input 3 when used for outside

temperature
171 4
Cluster
Fault on Analog Input 3 when used for outside

temperature
Step
Test Points
Specification
In Spec
NOT In Spec
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IK0800284 ­ Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
1
Page 4 of 5
Measure Resistance of the sensor and compare to

the chart below
Based on

Go To Next Step

Ambient Temp.
Replace Sensor
2
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
3
Measure voltage between ambient temperature

sensor connector 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
AAT SENSOR TEMP VS. RESISTANCE CHART
Figure 6
CLUSTER 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

• 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.
OTHER RESOURCES

• IK0800369 - 2006-2009 Cummins Active Fault 249 / 256 Ambient Air Temperature Sensor 1 Circuit
WARRANTY CODING/SRT
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IK0800284 ­ Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
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NOTE: Claims for this procedure should be coded to: Warranty.

12000
160
Sender, Ambient Temperature
08960
784
Thermometer, Electronic
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You received the following feedback From: dyynjz1 ­ Nick Zogelman Email Address: [email protected] Job Classification: SE003, Service Manager 4/15/2014

Dealer: WILLIAMS SERVICE Feedback: WHAT IS NEW ABOUT THIS ARTICLE

11:24:39 AM
Copyright © 2014 Navistar, Inc.
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