International DT466 – ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS – VREF Circuit Operation

The ECM supplies VREF at Pin X1–14 (engine connector) and at X4–4 (chassis connector) when the ignition switch is on.

Fault Detection / Management
There are no DTCs for VREF. When a VREF circuit fault occurs in a sensor, the ECM may set an out of range
high or low code. Multiple high or low codes are indicators of a V REF or signal ground fault condition.
When a VREF signal is shorted to ground, shorted to ground occurs, the ECM will reset and cause a stumble.
When the ECM sets multiple sensor DTCs, the VREF circuit is open or shorted, or the signal ground circuit is open. To determine if the V REF circuits are the cause, complete the pin-point diagnostics check.

Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• Breakout Harness
• Breakout Box
• Terminal Test Adapter Kit
NOTE: After removing connector, inspect for damaged pins, corrosion, or loose pins. Repair as required.

 

24. November 2021 by samuel
Categories: International DT466 | Comments Off on International DT466 – ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS – VREF Circuit Operation