The PACCAR MX P1134 page of the 2013 PACCAR MX Diagnostic Service Manual is the manufacturer reference for diagnostic trouble code P1134, described in the manual as “Lambda sensor heater – Voltage too low or short circuit to ground on ECU D420 pin C46”. It is a 5-page PDF section covering lambda sensor heater diagnostics on EPA2013 PACCAR MX engines, and it keeps the same layout as every other code page in that manual.
Document details and coverage
| Brand | PACCAR |
| Model coverage | PACCAR MX engines, EPA2013 emissions |
| System group | DTCs / MX Engines (EPA2013) |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual |
| Fault code | P1134 |
| Subject | Lambda sensor heater |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
What PACCAR MX P1134 means
The manual files P1134 as a 1 trip MIL code with 3 drive cycle recovery, readiness group None and freeze frame type Exhaust gas. The diagnostic runs when engine speed is between 950 and 2000 rpm, the engine is at a steady load and coolant temperature is above 50°C [122°F]. The code sets when the diagnostic starts five minutes after the engine starts and then runs continuously, and it changes to inactive immediately after the diagnostic runs and passes.
Possible causes and technical data
- Faulty wiring
- Faulty connector
- Faulty sensor
Technical data covers the component check on lambda sensor (F834) with the ignition keyed off and connector F834 disconnected, including a heater element resistance of 2.4-4.0 Ω at 20°C [68°F], plus a circuit check back to the PCI ECU (D420). The page then runs 5 numbered troubleshooting steps, each with its own step ID, starting from a visual inspection of connectors and harness with the ignition off. The manual warns against back probing, notes that disconnecting the EAS connectors during troubleshooting produces multiple errors, and reminds the technician to exit the fault code menu in DAVIE and rerun the test before judging whether anything changed.
Who needs this PACCAR MX P1134 manual page
Heavy-duty technicians, fleet shops and independent workshops diagnosing Kenworth and Peterbilt trucks with EPA2013 PACCAR MX engines use this page to confirm what the ECU actually measured before parts are ordered. For engine literature, dealer locations and support contacts beyond this single code, start at the PACCAR corporate website.
The complete PACCAR MX P1134 extract from the 2013 PACCAR MX Diagnostic Service Manual is filed in the DiagTechPro manuals library, where the 5-page PDF can be viewed or downloaded with a free account.
Related manuals library
