456 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
X4–24 to 2
<5Ω If > 5 Ω, check for open ground wire.
X1–7 to 1
<5Ω If > 5 Ω, check for open signal w ire.
1
Connector 9260 is a 2-wi r e connector usually lo c ated in the battery box. Pin A is the chassis ground connection for the
ECM and IDM. See truck Chassis Electrical Circuit Diagram Manual for
complete chassis side ECM and IDM ground
circuit information.
Operational Voltage Checks for IAT Sensor with Breakout Harness (Check with breakout harness
connected to sensor and engine harness.)
Test Point Temp Resistance
Voltage @ Resistance
2(Black)to1
(Green)
0 °C (32 °F) 91.1 kΩ
3.846 V
2(Black)to1
(Green)
20 °C (68 °F) 35.5 kΩ
3.041 V
2(Black)to1
(Green)
100 °C (212 °F) 2.0 kΩ
0.446 V
Operational Voltage Checks for IAT Sensor with Breakout Box (Check with breakout box connected
[X1 and X4 only] to the ECM and engine harness.)
X4–24 to X1–7
0 °C (32 °F) 91.1 kΩ
3.846 V
X4–24 to X1–7
20 °C (68 °F) 35.5 kΩ
3.041 V
X4–24 to X1–7
100 °C (212 °F) 2.0 kΩ
0.446 V
IAT Diagnostic Trouble Codes
DTC 154 = Signal voltage was < 0.127 V f
or more than 0.35 second
DTC 155 = Signal v oltage was > 4.6 V for more than 0.35 second
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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