Navistar International DT 466 Diagnostic/Troubleshooting Manual page 309

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
4. If code is active, do step 6 and 7 to check circuit
for the APS sensor using the following table.
• Circuit Checks for APS Sensor
5. If code is inactive, wiggle connectors and wires
at all suspected problem locations.
continuity is interrupted, the EST will display
DTCs related to the condition.
6. Disconnect chassis harness from APS sensor.
NOTE: Inspect connectors for damaged pins,
corrosion, or loose pins. Repair if necessary.
7. Connect APS Sensor Breakout Harness to
chassis harness only.
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.
Circuit Checks for APS Sensor (Use EST, DMM, breakout harness, and 500 Ohm Resistor Harness.)
Test Condition
Sensor disconnected using
EST
Measure voltage from Pin C
(Blue) to ground using DMM
500 Ohm Resistor Harness
connected between Pin A
(Green) and Pin C (Blue) of
breakout harness using.
Resistance from Pin B (Black)
of breakout harness to ECM
chassis ground Pin A of
connector 9260 using DMM.
Connect chassis harness to sensor and cycle key. Use the EST to clear DTCs. If an active code
remains after checking test conditions, inspect pedal assembly for excessive wear. If pedal
assembly is in tact, replace the APS/IVS sensor.
1
Connector 9260 is a 2-wire connector usually located in the battery box. Pin A is the chassis ground connection for the
ECM and IDM. See truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM ground
circuit information.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
If circuit
Spec Checks
0 V If voltage > 0.147 V, check signal circuit for short to V
5 V ±0.5 V If voltage > 5.5 V, check V
4.5 V, check V
5 V If voltage < 4.55 V, check signal circuit for open or short to
ground.
— Disconnect connector 9260
Pin C to Pin A of connector 9260 (spec > 1 kΩ) to check
for short to ground within wiring harness.
— Disconnect negative battery cable. Measure resistance
from Pin C to ground cable to check for short to ground.
— Use a breakout box to measure from Pin A to Pin X4–18
(spec < 5 Ω) to check for open in the harness.
< 5 Ω If resistance is > 5 Ω, check for open or high resistance
between ECM and sensor connector. Use a breakout box
and measure resistance from between Pin B and Pin X4–24
(spec < 5 Ω).
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
for short to B+. If voltage is <
REF
for open or short to ground.
REF
1
. Measure resistance from
305
or B+.
REF