Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Component Tests and General Diagnostics

COMPREHENSIVE COMPONENT MONITORING

ENGINE CONTROL UNIT

General Description
The purpose of this diagnosis is to detect electrical faults of the engine control unit.

Monitoring Conditions:
Ignition key on

Error Symptoms:
- Error based on ECU internal software checks
- Error based on ECU internal hardware checks

Flow chart: ECU monitoring