3.
Has a problem been found?
YES
a.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
a.
Go to " Signal Circuit Inspection " procedure.
Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
Go to " Signal Circuit Inspection " procedure.
Check open in harness
IG "OFF".
Disconnect IATS connector.
IG "ON" & ENG "OFF"
Measure voltage between terminal 3 of IATS harness connector and chassis ground.
Specification : Approx. 5V
Is the measured voltage within specification ?
YES
Go to "Check short to ground in harness" as follows.
NO
Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
Check short to ground in harness
IG "OFF".
Disconnect IATS and ECM connector.
Measure resistance between terminal 3 and 4 of IATS harness connector.
Specification : Infinite
Is the measured resistance within specification ?
YES
Go to "Ground Circuit Inspection" procedure.
NO
Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
IG "OFF".
Disconnect IATS connector.
IG "ON" & ENG "OFF"
Measure voltage between terminal 3 of IATS harness connector and chassis ground(A)
Measure voltage between terminal 3 and 4 of IATS harness connector. (B)
Specification : "A" - "B" = Below 200mV
Is the measured voltage within specification ?
YES
Go to "Component Inspection" procedure.
NO
Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
