ENGINE ELECTRICAL 313
ECM, IDM, EGR Drive Module, and Intake Air
Heater
WARNING: To prevent serious personal
injury, possible death, or damage to the engine or
vehicle, disconnect the main negative battery
terminal before removing or inst alling a ny
electrical components.
CAUTION: To prevent engine damage, make sure
the key is in the OFF position before unplugging the
connector or relay for the ECM, IDM, and EGR drive
module. Failure to turn the key to the OFF position
will cause a voltage spike and damage the electrical
components.
CAUTION: To prevent engine damage, do not tug on
any wiring harnesses while trying to remove them. If
resistance is felt, find the source of resistance and
free up any connectors or clips that are caught before
proceeding.
Figure 469 ECM, IDM, EGR drive module, and
tube assembly overview
Figure 470 ECM and sensor harness locations
1. ICP sensor connector
2. EGR drive module
3. IDM connector
4. ECM chassis connectors (2)
5. Intake air heater relay connections (2)
6. CKP sensor
7. ECM engine connectors (2)
Disconnecting the sensor wiring harness at the
drive modules.
1. Disconnect the ICP connector from the valve
cover connection.
2. Disconnect the EGR drive module.
3. Disconnect the IDM connector.
4. Disconnect two ECM chassis connectors.
5. Disconnect two intake air heater relay connectors.
6. Disconnect the CKP sensor.
7. Disconnect two ECM engine connectors.
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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