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 or replace if necessary and go to "Verification of Vehicle Repair" procedure
NO
▶ Go to "Power Circuit Inspection" procedure.
■ Check voltage
IG "OFF"
Disconnect MAPS connector
IG "ON"
Measure the voltage between power terminal of MAPS harness connector and ground.
Specification : Approx. 5V
Is the measured voltage within specification ?
YES
▶ Go to "Ground Circuit Inspection" procedure.
NO
▶ If the voltage is over 5.1V, check short to battery in harness.
▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
■ Check open in harness
IG "OFF".
Disconnect MAPS connector.
IG "ON" & ENG "OFF"
Measure the voltage between power terminal of MAPS harness connector and chassis ground. (Measurement "A")
Measure the voltage between power and ground terminals of MAPS harness connector. (Measurement "B")
Specification : "A" - "B" = : Approx. below 200mV
Is the measured voltage within specification ?
YES
▶ Go to "Signal Circuit Inspection" procedure.
NO
▶ Repair contact reistance or open in harness and then go to "Verification of Vehicle Repair" procedure.
■ Check short to battery in harness
IG "OFF"
Disconnect MAPS and PCM connector.
Measure resistance between signal and power terminals of MAPS harness connector.
Specification : Infinite
Is the measured resistance within specification ?
YES
▶ Go to "Component Inspection" procedure.
NO
▶ Repair short to battery in harness and then go to "Verification of Vehicle Repair" procedure.
