1A
Fuel Pressure Check
System Diagram
1. Injector (A): Fuel pressure gauge 09912-58442
2. Delivery pipe (B): Hose 09912-58432
3. Fuel filter and fuel pump (C): Attachment 09912-58490
4. Fuel pressure regulator      
Troubleshooting
NOTE:
Before using the following flow, check to make sure that battery voltage is higher than 11 V. If battery voltage is low, pressure becomes lower than specification even if fuel pump and line are in good condition.
Step Action YES NO
1
Fuel pressure check
1) Check fuel pressure referring to Fuel Pressure Inspection:M13A .
Are they satisfied each condition?
Go to Step 2.
Go to Step 5.
2
Fuel pressure check
1) Start engine and warm it up to normal operating temperature.
2) Keep engine speed to 4000 rpm.
Does fuel pressure shows the value which is about the same as Step 1?
Go to Step 3.
Go to Step 8.
3
Fuel line check
1) Check fuel pipe, fuel hose and joint for fuel leakage.
Are they in good condition?
Go to Step 4.
Repair or replace.
4
Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or deform.
Are they in good condition?
Faulty fuel pressure regulator.
Repair or replace.
5
Was fuel pressure higher than specification in Step 1?
Go to Step 6.
Go to Step 7.
6
Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or deform.
Are they in good condition?
Faulty fuel pressure regulator.
Repair or replace.
7
Fuel pump operating sound check
1) Remove fuel filler cap and then turn ON ignition switch.
Can you hear operation sound?
Go to Step 8.
Faulty fuel pump.
8
Fuel line check
1) Check fuel pipe, fuel hose and joint for damage or deform.
Are they in good condition?
Clogged fuel filter, faulty fuel pump, faulty fuel pressure regulator or fuel leakage from hose connection in fuel tank.
Repair or replace.