Test the connector before replacing the component
Fault code names the component. Parts cannon says replace it. Diagnostics says prove the connector first.
What this lesson covers
CORE TEACHING Connector supply; ground under load; command; terminal tension; corrosion; pin drag; back-probing vs piercing. PRACTICAL DEMONSTRATIONS AND TESTS Inspect connector; voltage; loaded ground; command; pin-fit test; wiggle. ADVANCED / SCAN TOOL LAYER Scope signal on both sides of connector when intermittent. KEY DIAGNOSTIC QUESTIONS Is everything the component needs arriving correctly at its pins? MUST-COVER CHECKPOINTS Start with the complaint; draw the circuit; identify expected inputs/outputs; perform physical tests; interpret evidence; prove the failed section; retest after repair.
What you will be able to do
Fault code names the component. Parts cannon says replace it. Diagnostics says prove the connector first.
Where it sits in the programme
- Builds on
- Lesson 47: Power–ground–signal: the default framework
- Feeds into
- Lesson 49: Loaded circuit testing
More in Diagnostic Method
- 47Power–ground–signal: the default framework
- 48Test the connector before replacing the component
- 49Loaded circuit testing
- 50Finding open circuits
- 51Finding shorts to ground
- 52Finding shorts to positive and back-feeds
- 53Parasitic battery drains
- 54When pulling one fuse kills the drain
- 55ECUs and control modules
- 56The complete Voltzs diagnostic workflow