Idle validation switch circuit — Cummins Fault Code 431 SSS

This idle validation switch circuit guide covers Cummins Fault Code 431 (PID P091, SPN 91, FMI 3, SRT 00-611) for the SSS variant on the M11 CELECT Plus. It is a 4-page yellow-lamp document explaining how the ECM confirms pedal position.

Official document details

Document table of contents

• Circuit description
• Component location
• Shop talk diagnostic notes
• Step-by-step troubleshooting
• Fault verification and clearing codes

validation switch circuit checks

The switch tells the ECM when the accelerator pedal is released (on-idle) or depressed (off-idle) and is factory-adjusted to the correct pedal position; the solid-state integrated sensor switch (SSS) is an active component that needs voltage to inspect the circuit. Shop talk attributes the fault to a loose connection, an uncalibrated pedal, or mis-wiring, and notes that breakout cable part number 3824892 is required to check SSS voltage levels. When checks pass, the manual directs replacing the validation switch circuit wires between pedal and ECM and re-sealing the bulkhead openings.

Applicable truck models

The sheet applies to the Cummins M11 CELECT Plus (1995-98) with the SSS accelerator pedal assembly. Confirm the pedal-calibration procedure on the official Cummins website.

Who needs this validation switch circuit manual

Technicians diagnosing idle or throttle faults on M11 CELECT Plus trucks fitted with the solid-state SSS pedal use these voltage checks.

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Applies to these truck models

This is the manufacturer document shared across 2 model families. It applies to:

• Cummins DTCs
• Cummins M11 CELECT Plus (1995-98)

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Idle validation switch circuit — Cummins Fault Code 431 SSS 1 / 4 − +

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