Pin-Point Diagnostics - Navistar International DT 466 Diagnostic/Troubleshooting Manual

542 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
V

Pin-Point Diagnostics

REF
Voltage Reference Connector Checks (If multiple DTCs are set, remove harness connections and
measure V at suspected sensor circuits.)
REF
Sensor Test Point
EBP 2 to gnd
MAP 2 to gnd
ICP B to gnd
APS C to gnd
BAP 2 to gnd
EOP 2 to gnd
BCP (optional) B to gnd
EFP (optional) 2 to gnd
WIF (optional) B to gnd
1
Test point Pin B is at vavle cover pass through connector. If additional testing is needed, test point Pin 2 should be used
at under valve cover connector.
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 Checks to Chassis Ground (Turn the ignition switch to OFF. Disconnect sensors and negative
battery cable.)
Sensor Test Point
EBP 2 to gnd
MAP 2 to gnd
ICP B to gnd
APS C to gnd
BAP 2 to gnd
EOP 2 to gnd
BCP (optional) B to gnd
EFP (optional) 2 to gnd
WIF (optional) B to gnd
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Spec
5 V ±0.5 V
5 V ±0.5 V
1
5 V ±0.5 V
5 V ±0.5 V
5 V ±0.5 V
5 V ±0.5 V
1
5 V ±0.5 V
5 V ±0.5 V
5 V ±0.5 V
Spec
>500 Ω
>500 Ω
1
>500 Ω
>1 kΩ
>1 kΩ
>500 Ω
1
>500 Ω
>500 Ω
>500 Ω
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Comment
Check V at each sensor. To isolate area of short
REF
or open circuit, identify sensors without V
sensors that share a common V
a sensor causes V to be present in the circuit that
REF
had no previous V , it is likely that the disconnected
REF
sensor had shorted V
REF
Comment
If resistance is < spec, check for short to ground. If a
short to ground condition exists, remove all sensor
connectors that are connected to V
Inspect to determine if short is in sensor, ECM, or
wiring harness. Spec is >1 kΩ with all common
sensors disconnected from harness.
and
REF
. If disconnecting
REF
to ground.
and ECM.
REF