Many malfunctions in the electrical system are caused by poor harness(es) 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 next step as below.
Check short to battery in harness.
IG "OFF".
Disconnect MAPS and ECM connector.
IG "ON" & Eng. "OFF"
Measure voltage between terminal 1 of the MAPS harness connector and chassis ground.
Specification : 0V
Is the measured voltage within specification ?
YES
Go to next step as below
NO
Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
IG "OFF".
Measure resistance between terminal 4 of MAPS harness connector and chassis ground.
Specification : Below 1Ω
Is the measured resistance within specification ?
YES
Go to next step as below
NO
Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
