Vss Pin-Point Diagnostics (Manual Transmissions) - Navistar International DT 466 Diagnostic/Troubleshooting Manual

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
VSS Pin-Point Diagnostics (Manual
Transmissions)
Figure 509 VSS circuit diagram (manual transmissions)
The VSS circuit requires the use of vehicle circuit diagrams. See truck Chassis Electrical Circuit Diagram
Manual for circuit numbers, connector and fuse locations.
Connector Voltage Checks (Disconnect harness from sensor. Inspect for bent pins or corrosion. Turn the
ignition switch to ON.)
Test Point
B to gnd
A to gnd
Sensor Resistance Checks (Check with sensor disconnected and ignition switch OFF.)
B to A
Sensor and Circuit Resistance Checks (Check with breakout box connected [X4 only] to engine harness
only with VSS connected. Inspect for bent pins or corrosion.)
X4–10 to X4–9
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
B to gnd cable
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Spec
2 V to 3 V
2 V to 3 V
600 Ω to 800 Ω
600 Ω to 800 Ω
> 1 kΩ
> 500 Ω
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Comment
ECM pull up voltage when sensor disconnected. If no
voltage present, check for open or short to ground.
Manual transmission (measure resistance through sensor)
Manual transmission (measure resistance through sensor)
If < 1 kΩ, check for short to ground.
If < 500 Ω, check for short to ground.
EGES-270-1
547