Many malfunctions in the electrical system are caused by poor harness(s) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Check the following conditions:
Check for damaged harness and terminals: contact resistance, oxidation, bent or broken terminals.
Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection
Use a suitable male pin to ensure that contact in sockets is good. The pin should remain in position when pulled gently.
Has a problem been found?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
System OK. Go to "Verification of Vehicle Repair" procedure
Visually check for leak from exhaust system (especially between TWC converter and front exhaust pipe).
Are any leaks present?
NO
Go to "Intake system Inspection"
YES
Repair exhaust system leaks as necessary and go to "Verification of Vehicle Repair"
Check intake system for leaks, cracks, loose connection as follwing items :
Throttle body gasket.
Gasket between intake manifold and surge tank.
Seals between intake manifold and fuel injectors.
Seals between surge tank and PCV valves..
Are any vacuum leaks present?
NO
Go to "Fuel pressure inspection"
YES
Repair intake system leaks as necessary and go to "Verification of Vehicle Repair"
After loosening the nut fastened at fuel delivery pipe in engine room,separate the high pressure hose and pipe.
Using the fuel pressure gauge adaptor,install the pressure gauge on the fuel delivery pipe.
Applying battery voltage at the terminal of fuel pump,check any leakage out of pressure gauge and connecting position.
Start an engine and warm up to operating temperature.
Check for fuel pressure at idle.
Specification
Fuel pressure at idle : 51 psi(350kPa),3.5Kg/㎠
Is fuel pressure within specification?
YES
Go to "Component Inspection"
NO
Check fuel delivery system
Repair as necessary and go to "Verification of Vehicle Repair" procedure
