8826478

Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damage of component.

Perform checking procedure as follows.

(1)

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

(2)

Check connecting condition of ECM and component connector : Check terminal separation, damage of locking device and connecting condition between terminal and wiring.

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Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition.(After checking, reconnect the pin at correct position.)

Has a problem been found?

	▶ Repair the trouble causing part and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Power Circuit Inspection".

Check voltage between heater power('Engine control relay 'ON') terminal of 'LAMBDA SENSOR' harness connector and chassis ground.

Specification : 10.5V ~ 14.5V

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Is the measured value within specification?

▶ Go to "Control Circuit Inspection".

▶ If no voltage is detected, repair short to ground / open between 'SNSR3 FUSE 10A' terminal of 'E/R JUNCTION BOX' and heater power('Engine control relay 'ON') terminal of 'LAMBDA SENSOR' harness connector, and go to "Verification of Vehicle Repair" procedure.

▶ If the voltage is higher than specification value, repair short to battery between ''SNSR3 FUSE 10A' terminal of 'E/R JUNCTION BOX' and heater power('Engine control relay 'ON') terminal of 'LAMBDA SENSOR' harness connector, and go to "Verification of Vehicle Repair" procedure.

Check voltage between 'Heating' terminal of 'LAMBDA SENSOR' harness connector and chassis ground.

Specification : 4.5V ~ 4.8V

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Is the measured value within specification?

▶ Go to "Component Inspection" procedure.

▶ If no voltage is detected, go to "Check open in lambda sensor heater control circuit" as follows.

▶ If the voltage is higher than specification value, repair short to battery between 'Heating' terminal of 'LAMBDA SENSOR' harness connector and 'Heating' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

Check resistance between 'Heating' terminal of 'LAMBDA SENSOR' harness connector and 'Heating' terminal of ECM harness connector.

Specification : Continuity (below 1.0Ω )

note

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Is the measured value within specification?

	▶ Repair short to ground between 'Heating' terminal of 'LAMBDA SENSOR' harness connector and 'Heating' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.
	▶ Repair open between 'Heating' terminal of 'LAMBDA SENSOR' harness connector and 'Heating' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.