This document is a fault code 429 DTCs troubleshooting manual for the water-in-fuel indicator sensor circuit. It explains the circuit description, fault conditions, INSITE™ checks, harness inspections, resistance tests, sensor replacement decision points, and fault-code clearing steps for CM2150 applications.
Official fault code 429 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; file listing identifies ISB6.7 CM2150 (2007-09) |
| System/Group | Water-in-Fuel Sensor Indicator / DTCs |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- FAULT CODE 429 Water-in-Fuel Indicator Sensor Circuit – Voltage Below Normal or Shorted to Low Source
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the water-in-fuel sensor.
- Guided Step 3 – Check the engine harness.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This procedure applies to Cummins ISB, ISC, and ISL engines with CM2150 control, with the library grouping specifically listing ISB6.7 CM2150 (2007-09). The document describes an OEM supplied suction fuel filter on the intake side of the engine and a water-in-fuel sensor integrated into the bottom of that fuel filter. For current manufacturer information, visit Cummins official website.
Who needs this fault code 429 DTCs manual
Workshop technicians and fleet mechanics need this fault code 429 DTCs manual when the amber CHECK ENGINE light is triggered by low voltage on the water-in-fuel circuit. It is useful for diagnosing a signal circuit shorted to ground in the harness, sensor, or connector, and for confirming whether the condition follows the sensor, the engine harness, or the ECM response.
The guided tests use INSITE™ electronic service tool to check active and inactive fault codes, verify whether Fault Code 428 becomes active when the water-in-fuel sensor is disconnected, and confirm whether Fault Code 429 returns after reconnection. Later steps cover ECM connector inspection, pin-to-pin short-circuit testing, pin-to-ground resistance testing, and the greater than 100k ohms specification for harness checks. The procedure also references related service manual procedures for Component Connector and Pin Inspection, Resistance Measurements Using a Multimeter, Engine Wiring Harness, Water in Fuel Sensor, Inactive or Intermittent Fault Codes, ECM Calibration Code, and Electronic Control Module replacement authorization.
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