The Cummins fault code 3142 troubleshooting guide is the official Cummins diagnostic procedure for Aftertreatment SCR Intake Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source on the ISX11.9 CM2250 engine platform. This 19-page PDF documents the circuit description, the conditions that set and clear the fault, and the guided steps a technician follows to isolate and repair it.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 |
| System / Group | Aftertreatment SCR Intake Temperature Sensor Circuit |
| Fault code | 3142 (SPN 4360, FMI 3) |
| Warning lamp | Amber |
| Pages | 19 |
| File size | 0.2 MB |
| Format | |
| Language | English |
| Last revised | 21-Dec-2010 |
Cummins fault code 3142 contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and guided troubleshooting steps
Fault meaning and symptoms
The document defines fault code 3142 as Aftertreatment SCR Intake Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. The selective catalytic reduction (SCR) intake temperature sensor is used by the electronic control module (ECM) to monitor the engine exhaust temperature entering the SCR catalyst. The ECM monitors the voltage on the signal pin and converts this to a temperature value. The condition is monitored on SPN 4360, FMI 3, and is annunciated with an amber CHECK ENGINE / malfunction indicator lamp. Documented causes in the Shop Talk section include open return circuit in the harness, connectors, or sensor, open signal circuit or shorted to a voltage source, malfunctioning aftertreatment scr catalyst temperature sensor interface module. Each fault is worked with the INSITE electronic service tool, cross-referencing associated procedures 019-031, 019-032, 019-043, 019-449, 019-464, 019-361, 019-071, 019-360.
Applicable truck models
This procedure covers Cummins ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 engines built for the 2010-12 on-highway emissions platform, so it suits Class 8 trucks and vocational chassis running these engines. Confirm the exact application and current calibration against the official Cummins website before ordering parts.
Who needs this Cummins fault code 3142 manual
Diesel technicians and workshop owners who read 3142 on the INSITE service tool use this manual to follow the factory-approved diagnostic tree instead of replacing parts by guesswork. It is equally useful for fleet maintenance staff verifying a repair before returning a truck to service.
The full PDF is available in the DiagTechPro manuals library, a free account is required to download.
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