EEC, Control unit for exhaust gas aftertreatment
â–¶ How to fix
Start the engine and use SDP3 to check the battery voltage. Refer to EEC3>Inspection>Troubleshooting>System overview>Battery voltage. If the voltage is low, troubleshoot components that affect the voltage.If the voltage in other systems is correct when the engine is running and the fault persists, measure the voltage to the EEC control unit. If the voltage is too low, check the cable harness to the control unit.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The battery voltage to the EEC control unit is too low.
Possible cause
Fault in the cable harnesses or components involved in the voltage supply.