492 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Figure 478 Cylinder 3 and 4 circuit diagram
Injector Cy linder 3
Test Point
Spec Comment
X1–17toX1–3
0.7 Ω to 1.5 Ω If > 1.5 Ω, check for open or high resistance between IDM
and injector, or open injector coil.
X1–17 to gnd, X1–3 to gnd
>1kΩ If < 1 kΩ, check for short to ground in harness or injector
coil. Disconnect injector and retest. If > 1 kΩ, the short
is in the injector.
X1–18toX1–8
0.7 Ω to 1.5 Ω If > 1.5 Ω, check for open or high resistance between IDM
and injector, or open injector coil
X1–18 to gnd, X1–8 to gnd
>1kΩ If < 1 kΩ, check for short to ground in harness or injector
coil. Disconnect injector and retest. If > 1 kΩ, the short
is in the injector.
Injector Cy linder 4
Test Point
Spec Comment
X2–1 to X2–21
0.7 Ω to 1.5 Ω If > 1.5 Ω, check for open or high resistance between IDM
and injector, or open injector coil
X2–1 to gnd, X2–21 to gnd
>1kΩ If < 1 kΩ, check for short to ground in harness or injector
coil. Disconnect injector and retest. If > 1 kΩ, the short
is in the injector.
X2–5 to X2–22
0.7 Ω to 1.5 Ω If > 1.5 Ω, check for open or high resistance between IDM
and injector, or open injector coil
X2–5 to gnd, X2–22 to gnd
>1kΩ If < 1 kΩ, check for short to ground in harness or injector
coil. Disconnect injector and retest. If > 1 kΩ, the short
is in the injector.
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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