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 " Power Circuit Inspection" procedure.
Check power to IG failure sensor
Ignition "OFF"
Disconnect IG failure sensor connector.
Ignition "ON" & Engine "OFF"
Measure voltage between terminal "4" of IG failure sensor harness connector and chassis ground.
Specification : B+
Is the measured voltage within specifications?
YES
▶ Go to " Ground Circuit Inspection " procedure.
NO
▶ Check for open or short to ground in harness, repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Check for open in harness
Ignition "OFF"
Disconnect IG failure sensor connector.
Measure resistance between terminal "1" of IG failure sensor harness connector and chassis ground.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
▶ Go to " Power Output Circuit Inspection ’ procedure.
NO
▶ Check open in harenss.
▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.
Check for open in harness
Ignition "OFF"
Disconnect IG failure sensor connector and ignition coil connectors.
Measure resistance between terminal "3" of IG failure sensor harness connector and "1" of each ignition coil harness connector.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
▶ Go to " Signal Circuit Inspection ’ procedure.
NO
▶ Check open in harenss between IG failure sensor and Ignition coil.
▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.
Check for short to ground in harness
Ignition "OFF"
Disconnect IG failure sensor connector.
Measur resistance between terminal "2" of IG failure sensor harness connector and chassis ground.
Specification : Infinite
Is the measured resistance within specifications?
YES
▶ Go to " Check for short to battery in harness " as below.
NO
▶ Check short to ground in signal harness.
▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.
Check for short to battery in harness
Ignition "OFF"
Disconnect IG failure sensor connector.
Measure resistance between terminals "2" and "4" of IG failure sensor harness connector.
Measure resistance between terminals "2" and "3" of IG failure sensor harness connector.
Specification : Infinite
Is the measured resistance within specifications?
YES
▶ Go to " Check for open in harness " as below.
NO
▶ Check short to battery in signal harness.
▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.
Check for open in harness
Ignition "OFF"
Disconnect IG failure sensor and PCM connector.
Measure resistance between terminal "2" of IG failure sensor harness connector and terminal "3/C21-B" of PCM harness connector.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
▶ Go to " Component Circuit Inspection " procedure.
NO
▶ Check open in harenss between IG failure sensor connector and PCM connector.
▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.
