This ISB fault code DTCs document covers Fault Code 133 for the remote throttle position sensor circuit on ISB CM550 engines. It identifies PID P029, SPN 29, FMI 3, explains the sensor signal used by the ECM, and gives step-by-step electrical troubleshooting. The file is a 7-page PDF intended for diagnostic work on the OEM harness, sensor, and ECM-related circuits.
Official ISB fault code DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Remote Throttle Position Sensor Circuit |
| Publication no. | Not specified in the extract |
| Year/Revision | Unknown; document copywrite 2017 |
| Pages | 7 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 133
- PID: P029
- SPN: 29
- FMI: 3
- Remote Throttle Position Sensor
- Remote Throttle Position Sensor Circuit
- Description
- Component Location
- Troubleshooting Steps
- Step 1A through Step 1C: connector inspection and active fault checks
- Step 2A through Step 2C: sensor-side resistance checks
- Step 3A through Step 3F: OEM harness, ECM connector, open circuit, and short circuit checks
- Step 4A through Step 4B: fault disable, throttle calibration, verification, and clearing inactive faults
Applicable truck models
This document applies to Cummins ISB CM550 (1990-94) engines where Fault Code 133 is logged for the remote throttle position sensor circuit. The extract does not name specific truck makes or chassis models because the remote throttle pedal location varies with each OEM and the repair process refers technicians to the OEM manual for location and harness details. The procedure covers the remote throttle pedal, throttle position sensor potentiometer, OEM harness, OEM interface harness, ECM connector pins, +5-VDC supply, signal wire, return wire, and related short or open circuit checks. For official manufacturer information, visit Cummins official website.
Who needs this ISB fault code DTCs manual
Mechanics, fleet maintenance shops, and workshop owners need this manual when diagnosing Fault Code 133 with a diagnostic tool and a multimeter. It is useful when checking bent pins, corrosion, moisture, missing seals, sensor resistance ranges, harness continuity below 10 ohms, and short-circuit resistance above 100k ohms before replacing parts.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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