This Fault Code 529 document explains Fault Code 529 for the ISB CM550 dual-output driver B circuit. It identifies PID S051, SPN 703, FMI 3, and gives a step-by-step diagnostic path for checking OEM devices, solenoid wiring, harness connectors, and ECM-side circuits. The file is a 5-page PDF intended for fault isolation and repair verification.
Official Fault Code 529 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Dual-Output Driver B Circuit |
| Publication no. | Fault Code 529 |
| Year/Revision | Unknown |
| Pages | 5 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 529
- PID: S051
- SPN: 703
- FMI: 3
- DUAL-OUTPUT DRIVER B
- Dual-Output Driver B Circuit
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: check for extra wires on the OEM device
- Step 1B: clean the solenoid post and wiring terminal or OEM connectors
- Step 1C: check the OEM device resistance
- Step 2A: inspect 23-pin connector pins
- Step 2B: check for an open circuit from pin J to the connector solenoid
- Step 2C: check for a short in the supply wire to ground
- Step 2D: check for a short circuit from pin to pin
- Step 3A: inspect ECM and engine harness connector pins
- Step 3B: check the engine harness open circuit from pin 21 to pin J
- Step 3C: check pin 21 to engine block ground
- Step 3D: measure pin 21 to all other pins in the engine harness connector
- Step 4A: disable the fault code and verify inactive status
- Step 4B: clear all inactive fault codes using the diagnostic tool
Applicable truck models
This document applies to Cummins ISB CM550 engines in the 1990-94 coverage group where Fault Code 529 is used for the Dual-Output Driver B Circuit. The OEM device location depends on the vehicle manufacturer, and the controlled device may be a fan clutch, intake grid heater, air cleaner restriction indicator, or oil filter differential pressure indicator. For engine manufacturer information, visit Cummins official website.
Who needs this Fault Code 529 manual
Workshop owners, diesel mechanics, and electrical diagnostic technicians need this Fault Code 529 manual when troubleshooting SPN 703 FMI 3 on ISB CM550 engines. It is useful when testing OEM harness wiring, the 23-pin connector, ECM pin 21, solenoid control wiring, and repair completion after clearing inactive fault codes.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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