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

316 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

BAP Pin-Point Diagnostics

Figure 385 BAP circuit diagram
NOTE: See truck Chassis Electrical Circuit Diagram Manual for circuit numbers, connector and fuse locations.
Connector Voltage Checks to Ground (Disconnect harness from sensor. Inspect for bent pins or
corrosion. Turn the ignition switch to ON.)
Test Point Spec
1 to gnd 0 V to 0.25 V
2 to gnd 5 V ± 0.5 V
3 to gnd 0 V to 0.25 V
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
chassis connector 9260
1 to Pin A (9260) < 5 Ω
2 to Pin A (9260) > 1 kΩ
3 to Pin A (9260) > 1 kΩ
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.)
1 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, check ground circuit for open or high resistance. Check
signal ground for short to V
If voltage is not to spec, V
to B+, or open.
If voltage > 0.25 V, signal circuit is shorted to V
1
.)
If > 5 Ω, check for open signal ground.
If < 1 kΩ, check for V
If < 1 kΩ, check for signal short to ground.
If < 500 Ω , check for short to ground.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
or B+.
REF
circuit is shorted to ground, shorted
REF
short to ground.
REF
EGES-270-1
or B+.
REF