306 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
APS/IVS P in - Po int Diagnostics
Connector Voltage Checks (Disconnect harness from sensor. Inspect for bent pins or corrosion. Connect
breakout harness to chassis harness only. Turn the ignition switch to ON.)
Test Point
Spec Comment
A to gnd 0 to 0.25 V Voltage > 0.25 V, signal is shorted to V
REF
or B+
Btognd 0V
Ground circuit, no voltage expected
Ctognd
5 V ±0.05 V Voltage > spec, wire shorted to B+; Voltage < spec, wire open or shorted to
ground
Dtognd 0Vto0.25
V
Voltage > 0.25 V, IVS signal wire shorted to V
REF
or B+
Ftognd B+
Voltage < 10.5 V check circuit for open or high resistance – blown fuse
Connector Resistance Checks to ECM Chassis Ground (Turn
theignitionswitchtoOFF.Connect
breakout harness to chassis harness only. Discon
nect chassis connector 9260
1
.)
A to Pin A (9260) > 1 k Ω If < 1 kΩ, check for short to ground within wiring harness.
B to Pin A (9260) < 5 Ω If > 5 Ω, check for open signal ground.
C to Pin A (9260) > 500 Ω If < 500 Ω, check for short to ground within wirin
gharness.
D to Pin A (9260) > 1 kΩ If < 1 kΩ, check for short to ground within wiring harness.
F to Pin A (9260) > 1 kΩ If < 1 kΩ with fuse removed, check for short to ground within wiring harness.
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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