This document is a Cummins fault code 524 troubleshooting manual for the switched droop selection circuit. It explains the circuit description, OEM switch states, connector locations by reference to OEM documentation, and step-by-step electrical checks for the engine harness, OEM harness, droop select switch, and final fault-code verification.
Official Cummins fault code 524 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Switched Droop Selection Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; copywrite 2017 shown on document pages |
| Pages | 6 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 524
- PID: P113
- FMI: 2
- SWITCHED DROOP SELECTION CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A through Step 1D: engine harness and ECM connector inspections, open circuit checks, short to ground checks, and short to other pins checks
- Step 2A through Step 2D: OEM harness and 23-pin connector inspections, open circuit checks, short to ground checks, and pin-to-pin short checks
- Step 3A through Step 3C: OEM switch pin inspection and droop selection switch resistance checks in position 2 and position 3
- Step 4A through Step 4B: disable the fault code, verify Fault Code 524 is inactive, and clear inactive fault codes with the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 engines in the 1990-94 coverage group where Fault Code 524, PID P113, FMI 2 is used for the switched droop selection circuit. The extract states that the droop switch circuit location varies with each OEM and equipment model, so the OEM manual is required for the physical component location. The procedure covers two-position and three-position droop switches, including open, closed, and 1500-ohm resistance states where provided by the OEM. For brand reference, see the official Cummins website.
Who needs this Cummins fault code 524 manual
Use this fault code 524 manual when a diagnostic tool reports Fault Code 524 and the repair path requires checking the ECM connector, engine harness pin 24, OEM 23-pin connector pin V, droop select switch wiring, switch resistance, and final code clearing. It is written for technicians who need the measured resistance thresholds shown in the procedure, including less than 10 ohms, greater than 100k ohms, and between 1000 and 2000 ohms for the applicable three-position switch check.
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