This is the 2013 PACCAR MX lambda sensor Diagnostic Manual, a complete service reference for troubleshooting DTC code P1135 (lambda sensor heater voltage too low or short circuit to supply on ECU pin D420 C46). Published by PACCAR, this five-page technical guide covers the lambda sensor heater system for EPA 2013 compliant MX engines used in heavy-duty trucks. The manual provides electrical diagrams, component specifications, and step-by-step diagnostic procedures required to isolate and repair heater circuit faults.
Document details and specifications — PACCAR MX lambda
| Brand | PACCAR |
| Model coverage | MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines |
| Publication number | P1135 |
| Year/Revision | 2013 |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- Code number P1135 and fault code description
- Fault code information (trip count, MIL, recovery cycles)
- Description of component(s) – lambda sensor, air/fuel ratio control, and sensor heater operation
- Sensor heating control – two-stage heating process and dew point calculation
- Effect on the system – smoke limit control, NOx emissions, DPF regeneration
- Location of component(s)
- Diagnostic condition and activation criteria
- Set and reset conditions of fault code
- Electrical diagram(s) – wiring harness connectors D420 and F834
- Technical data – lambda sensor (F834) component check and resistance values
- Technical data – ECU (D420) circuit check and power supply measurement
- Possible causes
- Diagnostic Step-by-Step procedure (Steps 1 through 5)
- Verification Drive Cycle for repair validation
Applies to these models
This lambda sensor heater diagnostic guide applies to PACCAR MX engines compliant with EPA 2013 emissions standards. The manual covers the lambda sensor component (F834) and its connection to the PCI ECU (D420) on 2013 model year and compatible heavy-duty trucks. For further technical assistance and official PACCAR engine documentation, visit PACCAR official website.
Who needs this PACCAR MX lambda sensor manual
This diagnostic guide is essential for diesel mechanics, workshop technicians, and fleet service managers responsible for PACCAR MX engine repair and emissions system maintenance. The PACCAR MX lambda sensor manual provides the electrical testing procedures, component specifications, and troubleshooting logic required to diagnose and resolve P1135 fault codes on EPA 2013 trucks.
The complete PDF is available in the DiagTechPro manuals library. A free account is required to download this document.
Related manuals library
