Navistar International DT 466 Diagnostic/Troubleshooting Manual page 460

456 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
X4–24 to 2
< 5 Ω
X1–7 to 1 < 5 Ω
1
Connector 9260 is a 2-wire connector usually located 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
2 (Black) to 1 0 °C (32 °F)
(Green)
2 (Black) to 1 20 °C (68 °F)
(Green)
2 (Black) to 1 100 °C (212 °F)
(Green)
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)
X4–24 to X1–7
20 °C (68 °F)
X4–24 to X1–7
100 °C (212 °F)
IAT Diagnostic Trouble Codes
DTC 154 = Signal voltage was < 0.127 V for more than 0.35 second
DTC 155 = Signal voltage was > 4.6 V for more than 0.35 second
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
If > 5 Ω, check for open ground wire.
If > 5 Ω, check for open signal wire.
Resistance
91.1 kΩ
35.5 kΩ
2.0 kΩ
91.1 kΩ
35.5 kΩ
2.0 kΩ
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Voltage @ Resistance
3.846 V
3.041 V
0.446 V
3.846 V
3.041 V
0.446 V