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7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
ICP Pin-Point Diagnostics (ECM to valve cover
gasket connector)
Figure 467 ICP circuit diagram with VC Gasket Breakout Harness
Connector Voltage Checks to Ground (Disconnect engine harness from valve cover gasket connector and
connect VC Gasket Breakout Harness to engine harness only. Turn the ignition switch to ON.)
Test Point
Spec
A to gnd
0 to 0.25 V
B to gnd
5 V ± 0.5 V
C to gnd
0 V to 0.25
V
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
harness from valve cover gasket connector. Connect VC Gasket Breakout Harness to engine harness only.
Disconnect chassis connector 9260
A to Pin A
> 1 kΩ
(9260)
B to Pin A
> 500 Ω
(9260)
C to Pin A
< 5 Ω
(9260)
WARNING: To avoid serious personal injury, possible death, or damage to the engine or vehicle,
always disconnect main negative battery cable first. Always connect the main negative battery cable
last.
Connector Resistance Checks to Chassis Ground (Turn the ignition switch to OFF. Disconnect chassis
1
connector 9260
. Disconnect negative battery cable. Disconnect harness from sensor. Use disconnected
negative battery cable for ground test point.)
A to gnd cable
> 1 kΩ
B to gnd cable
> 500 Ω
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Comment
If > 0.25 V, signal circuit is shorted to V
If voltage is not to spec, V
Signal ground (no voltage expected). If > 0.25 V, check ground circuit for
open or high resistance and check signal ground for short to V
1
.)
If < 1 kΩ, check for short to ground within wiring harness.
If < 500 Ω, check for short to ground within wiring harness.
If > 5 Ω, check for open circuit.
If < 1 kΩ, check for short to ground.
If < 500 Ω, check for short to ground.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
or B+.
REF
is shorted to ground, shorted to B+, or open.
REF
465
or B+.
REF
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