PSI Software Resource Center

Fast access toSoftware DownloadsEncrypted PasswordsPlot File TemplatesTraining Resources

Centralized tools, downloads, passwords, and training resources for field technicians.

Technician using diagnostic software

Encrypted password interface

Plot file template

Training instructor

System Overview

Software Downloads

Download diagnostic software for PSI engines and systems.

4G Displayv684C

Current

Current and most common Diagnostic Software.

Download Bulletin

Older Weichai WP Series may require legacy 4G v608A. Get Legacy v608A

GCP Display

Legacy

Legacy software for products up to 2024.

PSI Display

Legacy

Legacy software out of production since 2018.

LCI Display

Legacy

LCI Series software.

ECOM Driver

Current

Required interface driver.

Encrypted Passwords

4G Display (16 digit)

1BZI-2TOY-EKHF-CHCK

4G Display (26 digit)

DXNGNCZMKTKNE-FMO1N5JEHEBIU

GCP Display

NQUX-VK2M-FF3K-XDCJ

PSI Display

NVWW-ZKMN-NVWK-TDIN

Weichai 4G (16 digit)

RBK2-N4KI-JXDO-KDBF

Weichai 4G (26 digit)

AI4DGYWO4LCRR-5GCBJQNKGLK0M

Plot File Templates

Download plot file templates and recording guides.

4G PSI HD Plot Template v2.2 4G Industrial Plot Template v2.2 Loading and Recording Plots Plot File Recording Best Practice

Training Resources

Videos, guides, and documents to help you get started.

How to install 4G DisplayVideo

How to download ECM DetailsVideo

How to download ECM HistogramVideo

Connecting to dual ECMsPDF

Knowledge Info

4G Display software update v684C — Release Notes

Field Programmer

Field Programmerv6.6.4

Released January 29, 2026

ECM calibration updates.

Download Training Video

Lithium Ion Battery

iBMS Softwarev3.1.5

Released February 4, 2026

Battery Management System software.

Frequently Asked Questions