7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 419
EGR Actuator Resistance Checks Only (Turn the ignition switch to OFF. Disconnect
harness from
actuator. Connect breakout harness to actuator only. Note: Ensure DMM and lead
s are zeroed.)
1to2
>1kΩ If < 1 kΩ, short to sensor power exists.
1to3
>1kΩ If < 1 kΩ, short to sensor power exists.
1to4
>1kΩ If < 1 kΩ, short to sensor power exists.
1to5
>1kΩ If < 1 kΩ, short to sensor power exists.
5to2
>1kΩ If < 1 kΩ, short to sensor power exists.
5to3
>1kΩ If < 1 kΩ, short to sensor power exists.
5to4
>1kΩ If < 1 kΩ, short to sensor power exists.
6to7
2.1 Ω ±0.5 Ω If not in spec, replace actuator.
6to8
2.1 Ω ±0.5 Ω If not in spec, replace actuator.
7to8
2.1 Ω ±0.5 Ω If not in spec, replace actuator.
EGR Actuator Harness Connector Resistance Checks to ECM Chassis Ground (Turn the ignition
switch to OFF. Disconnect harness from actuator. Connect breakout harness to engine harness only.
Disconnect chassis connector 9260
1
.)
1toPinA(9260) >1kΩ If < 1 kΩ, short to g round exists.
2toPinA(9260) >1kΩ If < 1 kΩ, short to g round exists.
3toPinA(9260) >1kΩ If < 1 kΩ, short to g round exists.
4toPinA(9260) >1kΩ If < 1 kΩ, short to g round exists.
5toPinA(9260) <5Ω If > 5 Ω, an o pen circuit exists or high resistance. Specification is based
on 4300 chassis. For other applications, see Chassis Electrical Circuit
Diagram Manual for complete chassis grou nd circuit inform at i on.
6toPinA(9260) >1kΩ If < 1 kΩ, short to g round exists.
7toPinA(9260) >1kΩ If < 1 kΩ, short to ground exis
ts.
8toPinA(9260) >1kΩ If < 1 kΩ, short to g round exists.
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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