This fault code 443 DTCs document is a 5-page troubleshooting PDF for the accelerator position sensor circuit. It explains the fault description, component location, connector inspections, harness resistance checks, ECM voltage test, and final verification steps for the ISB CM550 DTC group.
Official fault code 443 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 |
| System/Group | ISB CM550 (1990-94) / DTCs; Accelerator Position Sensor Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; copyright 2017 shown on source pages |
| Pages | 5 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 443
- PID: P091 or S232
- SPN: 091 or 620
- FMI: 3 or 1
- ACCELERATOR POSITION SENSOR CIRCUIT
- DESCRIPTION
- COMPONENT LOCATION
- TROUBLESHOOTING STEPS
- Step 1A: OEM harness and accelerator position sensor connector inspection
- Step 1B: Read fault codes using the diagnostic tool
- Step 2A: OEM harness and ECM connector inspection
- Step 2B: Check for an open circuit
- Step 2C: Check for a short circuit to a chassis ground
- Step 2D: Check for a short circuit from pin to pin
- Step 2E: Check for a short circuit to a voltage source
- Step 3A: Measure the voltage out of the ECM
- Step 4A: Verify that Fault Code 443 is inactive
- Step 4B: Clear the inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 fault-code diagnostics in the 1990-94 DTC group. The extract identifies the accelerator pedal assembly with accelerator position sensor inside the vehicle cab and covers the OEM harness, ECM connector, accelerator position sensor connector, and engine block ground test points; it does not list specific truck makes or chassis models. For manufacturer information, visit Cummins official website.
Who needs this fault code 443 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when Fault Code 443 remains active or when the accelerator pedal signal, +5-VDC supply, OEM harness, or ECM output must be checked. It is useful for confirming whether the repair path points to the accelerator pedal assembly, accelerator position sensor, OEM harness, or ECM.
The full code 443 DTCs PDF is available in the DiagTechPro manuals library, free account required to download.
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