Repair Procedures

Heavy-Duty Diesel Repair Procedure Library

Step-by-step repair procedures for Cummins X15, PACCAR MX-13, Detroit DD15, and Volvo/Mack MP8. Each procedure includes torque specs, sensor checks, and fault code cross-references.

Cummins X15 PACCAR MX-13 Detroit DD15 Volvo/Mack MP8

Important: These procedures are reference guides. Always verify against your OEM service manual for your specific engine serial number and build date. Follow all OEM safety procedures.

Basic

Intermediate

Advanced

Cummins X15

ISX15 / X15

Injector

Cummins X15 Injector Replacement

Full injector replacement with trim code programming, torque sequence, and fuel rail pressure verification.

Advanced3–5 hours

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PACCAR MX-13

MX-13 / MX-11

NOx Sensor

PACCAR MX-13 NOx Sensor Replacement

Upstream or downstream NOx sensor replacement with DEF quality verification and SCR system test.

Basic45–90 min

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Detroit DD15

DD13 / DD15 / DD16

DPF Pressure Sensor

Detroit DD15 DPF Pressure Sensor Replacement

DPF differential pressure sensor replacement with pressure tube inspection and post-replacement verification.

Basic30–60 min

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Volvo/Mack MP8

D13 / MP7 / MP8

EGT Sensor

Volvo/Mack MP8 EGT Sensor Replacement

Exhaust gas temperature sensor replacement with circuit verification and post-replacement temperature check.

Basic30–60 min

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Why Use These Procedures

Torque spec links — every step that requires torque links to the full spec

Sensor check links — sensor verification steps link to pinout and test procedures

Fault code cross-references — related fault codes link to the AI Diagnostic Engine

Safety notes — OEM-aligned safety requirements before every procedure

Required tools — complete tool list for each procedure

Platform-specific — procedures are written for your specific engine platform

Related Resources

Torque Spec Library

Full torque specifications for X15, MX-13, DD15, and MP8 — values, sequences, and notes.

Sensor Location Guides

Connector pinouts, test procedures, and platform locations for every major diesel sensor.

AI Diagnostic Engine

Guided step-by-step diagnosis for any fault code — with live data interpretation.

Frequently Asked Questions

Are repair procedures free on AI Diesel Tech?

Yes — all static repair procedure pages are free and available without login.

Do repair procedures include torque specs?

Yes — each repair procedure step that requires a torque spec links directly to the corresponding torque spec page with the full torque value, sequence, and notes.

Do repair procedures include fault code cross-references?

Yes — each repair procedure includes related fault codes that link directly to the AI Diagnostic Engine for guided troubleshooting.

How are these procedures different from the repair procedures in the dashboard?

These static repair procedures are free, publicly accessible, and fully cross-referenced with the torque spec and sensor location knowledge graph. The dashboard repair procedures are database-backed and may include gated content for subscribers.

Looking for more repair procedures?

The full repair procedure library — including subscriber-gated advanced procedures — is available in the Repair Procedures section.

View full repair procedure library