This Cummins 385 troubleshooting document is a 6-page diagnostic procedure for Fault Code 385 on Cummins ISB CM550 applications. It covers the remote accelerator supply circuit, related +5 VDC sensor supply checks, harness inspections, resistance tests, voltage tests, and final fault-code clearing steps.
Official Cummins 385 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Remote Accelerator Supply Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Unknown |
| Pages | 6 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 385
- PID: S232
- SPN: 620
- FMI: 3 or 1
- REMOTE ACCELERATOR SUPPLY CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: Read the fault codes using the diagnostic tool
- Step 1B: Disconnect the coolant level sensor from the engine harness
- Step 1C: Disconnect the remote accelerator
- Step 2A: Inspect the OEM pigtail harness and engine harness connectors
- Step 2B: Read the fault codes with the OEM pigtail harness disconnected
- Step 2C: Inspect the engine harness and ECM connectors
- Step 2D: Check for a short circuit to ground at pin 49
- Step 2E: Check for a short circuit from pin to pin
- Step 3A: Inspect the OEM harness and ECM connectors
- Step 3B: Check pin 10 for a short circuit to chassis ground
- Step 3C: Check pin 10 to all other pins in the OEM harness
- Step 3D: Check pin 10 for a short circuit to a voltage source
- Step 4A: Measure ECM voltage from pin 10 to pin 20
- Step 5A: Verify Fault Code 385 is inactive
- Step 5B: Clear the inactive fault codes
Applicable truck models
This file applies to Cummins ISB CM550 (1990-94) engines where Fault Code 385 is used for the remote accelerator supply circuit. The extract identifies the remote accelerator position sensor, coolant level sensor, WIF sensor, OEM pigtail harness, engine harness, OEM harness, and ECM connector checks; it does not list specific truck makes or chassis models. For current manufacturer information, visit Cummins official website.
Who needs this Cummins 385 troubleshooting manual
Workshop technicians need this Cummins 385 troubleshooting manual when diagnosing an active or inactive Fault Code 385 involving +5 VDC supply faults, connector damage, harness shorts, or ECM output verification. It is also useful for shop owners who need a quick reference for deciding whether the repair path points to a sensor, harness, connector, or ECM.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
