This Cummins IVS circuit document is a 6-page troubleshooting PDF for Fault Code 431 on Cummins ISB CM550 electronic engine controls. It covers the idle validation switch circuit, accelerator pedal calibration, connector inspection, resistance checks, ECM supply voltage, OEM harness tests, and final fault-code clearing steps.
Official Cummins IVS circuit document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Idle Validation Switch Circuit |
| Publication no. | Fault Code 431; PID: P091; SPN: 091; FMI: 2 or 4 |
| Year/Revision | Unknown |
| Pages | 6 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 431
- PID: P091
- SPN: 091
- FMI: 2 or 4
- IDLE VALIDATION SWITCH (IVS) CIRCUIT
- Description
- Component Location
- Troubleshooting Steps
- Step 1A: Verify the IVS is connected to the OEM harness
- Step 1B: Calibrate the accelerator pedal
- Step 1C: Inspect the OEM harness and the IVS connectors
- Step 1D: Check for an open circuit in the IVS
- Step 1E: Check for a short circuit from pin to pin in the IVS
- Step 2A: Inspect the OEM harness and ECM connectors
- Step 2B: Check the ECM supply
- Step 2C: Check for a short circuit from pin to pin
- Step 2D: Check for an open circuit
- Step 2E: Check for a short circuit from pin to ground
- Step 3A: Verify that Fault Code 431 is inactive
- Step 3B: Clear the inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) engines using the idle validation switch on the accelerator pedal assembly. The extract does not name specific truck makes or chassis models, and it notes that accelerator pedal connector pin assignments can vary with the equipment manufacturer while the base troubleshooting logic still applies. For current engine and support information, visit Cummins official website.
Who needs this Cummins IVS circuit manual
This manual is for diesel technicians, fleet mechanics, and workshop owners diagnosing Fault Code 431 where the ECM sees an idle validation switch signal problem. It is useful when checking a loose connection, uncalibrated accelerator pedal, miswired IVS, bad ground on pin A, damaged pins, ECM 5 V supply, or OEM harness faults.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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