FUSO 4M4 – FUEL AND ENGINE CONTROL – TROUBLESHOOTING – Inspections Performed at Electronic Control Unit Connectors

• These inspections aid troubleshooting by enabling you to check whether electronic control unit signals are being correctly transmitted via the vehicle harness and connectors.
The white-on-black numbers ( 01 , 02 , and so on) correspond to the similarly printed reference numbers in section “3. Inspections Based on Diagnosis Codes”.

Electronic control unit connector terminal layout

Inspection instructions

• Some inspections are performed with the connectors removed. Others are performed with the connectors fitted.


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