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 voltage
Ignition "OFF"
Disconnect Ignition sensor connector.
Ignition "ON" & Engine"OFF"
Measure voltage between terminal 1 of each ignition coil harness connector and chassis ground.
Specification : Approx. B+
Is the measured voltage within specifications?
YES
▶ Go to "Ground Circuit Inspection" procedure.
NO
▶ Go to "Check for open in harness" as below.
Check for open in harness
Ignition "OFF"
Disconnect ignition coil connectors.
Measure resistance between terminal "2" of each ignition coil harness connectors and chassis ground.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
▶ Go to "Control Circuit Inspection " procedure.
NO
▶ Check for an open or short to battery in the ground circuit.
▶ Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
Check for short to battery in harness
Ignition "OFF"
Disconnect each ignition coil connector.
Measure resistance between terminal "1" and "3" of each ignition coil harness connector.
Specification : Infinite
Is the measured voltage within specifications?
YES
▶ Go to "Check for short to ground" in harness.
NO
▶ Check for short to battery in harness.
▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
Check for short to ground in harness
Ignition "OFF"
Disconnect each ignition coil connector.
Measure resistance between terminal "3" of each ignition coil harness connector and chassis ground.
Specification : Infinite
Is the measured resistance within specification ?
YES
▶ Go to "Check for open in harness" as below.
NO
▶ Check for short to ground in harness.
▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
Check for open in harness
Ignition "OFF"
Disconnect each ignition coil connector and PCM connector.
Measure resistance between terminal "3" of each ignition coil harness connectors and 11/C21-A, 12/C21-A of the PCM harness connector.
Specification : Approx. below 1Ω
Is the measured resistance within specifications ?
YES
▶ Go to "Component Inspection " procedure.
NO
▶ Check for open in harness.
▶ Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
