PACCAR MX P0201 is the fault-code chapter of the 2013 PACCAR MX Diagnostic Service Manual covering injector solenoid valve cylinder 1 current too low, or an open circuit on PCI ECU D420 pin A26 or A25. It is a one-trip MIL code with three drive cycle recovery and a comprehensive freeze frame type. The chapter also explains how injected fuel quantity depends on solenoid activation time combined with rail pressure.
Document details at a glance
| Brand | PACCAR |
|---|---|
| Model coverage | PACCAR MX engines, EPA 2013 emissions level |
| System group | DTCs, MX Engines EPA2013 |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual, pages 194 to 197 |
| Pages | 4 |
| File size | 0.5 MB |
| Format | |
| Language | English |
What the PACCAR MX P0201 chapter covers
- Injector calibration codes on the housing and connector, and why DAVIE must reprogram them
- The warning that wrong injector codes cause reduced engine performance or a driver warning
- Set condition: current in the pump control valve below 4.5 A
- Harness connector views for D420.A and for connectors B460 and B461
- Resistance of about 0.67 Ω at 20°C and a maximum of 0.94 Ω at 120°C
- Possible causes: faulty wiring, a faulty connector or a faulty solenoid valve
Diagnostic step sequence and verification
Inside PACCAR MX P0201 the procedure runs as follows. A visual inspection for bent, broken, corroded or loose pins comes first, then a key-on measurement of signal circuit voltage at the disconnected pump unit connector. Near 7.0 V sends you to a diode check; below 5.0 V or above 9.0 V jumps to the test at the PCI. The diode checks expect an open circuit on reverse bias and 600 mV plus or minus 200 mV on forward bias, separating a bad pump unit from a bad encapsulated harness.
Trucks and engines it applies to
This procedure is written for EPA 2013 PACCAR MX engines with common-rail injection, as fitted in Kenworth and Peterbilt tractors, with DAVIE connected throughout. Model programmes and dealer support for these engines are listed on the PACCAR corporate site.
Who needs the PACCAR MX P0201 chapter
Workshops facing a rough-running MX engine use this chapter to prove the circuit electrically before pulling a valve cover, and to catch the injector code step that is easy to skip.
The complete PDF of the PACCAR MX P0201 chapter is filed in the DiagTechPro manuals library, where a free account is required to download it alongside the rest of the MX Engines EPA2013 fault-code set.
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