This Cummins fault code 444 document is a troubleshooting manual for the remote accelerator supply circuit on Cummins ISB CM550 applications. It identifies PID S232, SPN 620, and FMI 3 or 4, and explains that the +5 VDC supply is shared by the remote accelerator and coolant level sensor circuits inside the ECM. The procedure also notes possible effects on the WIF sensor and that these circuits are OEM options that may not apply to every vehicle.
Official Cummins fault code 444 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; remote accelerator supply circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; extract shows Copywrite 2017 |
| Pages | 7 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 444
- PID: S232
- SPN: 620
- FMI: 3 or 4
- REMOTE ACCELERATOR SUPPLY CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A through Step 1C: read fault codes and isolate coolant level sensor or remote accelerator
- Step 2A through Step 2E: inspect OEM pigtail harness, engine harness, and ECM connectors; check resistance at pin 49
- Step 3A through Step 3D: inspect OEM harness and ECM connectors; test pin 10 for ground, pin-to-pin shorts, and voltage source shorts
- Step 4A: measure ECM output voltage from pin 10 to pin 20
- Step 5A and Step 5B: verify Fault Code 444 is inactive and clear inactive fault codes
Applicable truck models
This file applies to Cummins ISB CM550 engines from the 1990-94 coverage group when the vehicle uses the relevant OEM remote accelerator, coolant level sensor, OEM pigtail harness, engine harness, ECM connector, and WIF sensor arrangements described in the procedure. The extract does not name truck makes or chassis models, and it warns that connector pin assignments can vary by equipment manufacturer while the base troubleshooting logic still applies. See the manufacturer at Cummins official site.
Who needs this Cummins fault code 444 manual
Workshop owners, diesel mechanics, and fleet technicians need this manual when diagnosing active Fault Code 444 or related Fault Code 385 conditions on ISB CM550 vehicles. It supports practical checks for damaged pins, corrosion, moisture, missing seals, harness shorts to ground, pin-to-pin shorts, voltage shorts, coolant level sensor replacement, remote accelerator replacement, OEM harness replacement, engine harness repair, and ECM replacement decisions.
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