| 1 |
CHECK SYSTEM INTEGRITY
- Visually inspect the complete fuel delivery system, including fuel lines, connections, relays, damage to fuel tank, fuel pump, fuel pressure regulator, fuel pulse damper and fuel injector areas for leaks, looseness, cracks, kinks, pinching, or abrasion caused by a collision or mishandling.
- Visually inspect electrical harnesses and connectors for loose pins, corrosion, abrasion, or other damage from collision or mishandling.
- Verify vehicle has followed maintenance schedule.
- Verify fuel pump shutoff switch is set. See
INERTIA FUEL SHUTOFF (IFS) SWITCH
.
- Verify battery is fully charged (12.5 volts or greater).
- Verify electrical/fuse integrity.
- Verify fuel level is sufficient.
- Has any concern been found?
|
Yes |
REPAIR as necessary.
RERUN quick test.
See
PCM QUICK TEST
. |
| No |
Go to next step. |
| 2 |
CHECK FOR VOLTAGE AT FUEL PUMP HARNESS CONNECTOR
|
Yes |
Exit Output Test Mode.
RECONNECT fuel pump harness connector.
RESTORE vehicle.
Go to next step. |
| No |
CHECK for opens and shorts in the fuel pump power and ground circuits.
RESTORE vehicle. |
| 3 |
CHECK FUEL FILTER FOR PROPER MAINTENANCE
- Locate and inspect the vehicle maintenance schedule and fuel filter.
- Was the fuel filter serviced according to schedule?
|
Yes |
Go to next step. |
| No |
REPLACE fuel filter.
See
FUEL FILTER
. Go to next step. |
| 4 |
CHECK FUEL PRESSURE
WARNING:
- Before servicing or replacing any components in the fuel system, reduce the possibility of injury or fire by following directions in FUEL SYSTEM
for cautions, handling and warnings.
- Install fuel pressure tester.
- Release fuel pressure.
- Key ON, Engine OFF (KOEO).
- Connect WDS or equivalent tester.
- Select diagnostic data link.
- Select PCM.
- Select active command modes.
- Select output test mode.
- Select fuel pump PID.
- Press MODE to change to the ALL ON mode.
- Press start to run the fuel pump.
NOTE:
- The fuel pump will only operate for approximately 8 seconds when Output Test Mode is selected and activated.
- Is fuel pressure between 380-482 kPa (55-70 psi)?
|
Yes |
Go to next step. |
| No |
For fuel system with more than 482 kPa (70 psi):
REPLACE fuel pump.
See
FUEL PUMP MODULE
.
RESTORE vehicle.
RECHECK fuel pressure.
For fuel system with less than 380 kPa (55 psi): Go to next step. |
| 5 |
CHECK FUEL INJECTOR FLOW AND LEAKAGE
- Check injectors for leakage and flow rate using an injector tester
- Is the flow rate and leakage rate for the injectors tested within specification?
|
Yes |
VERIFY no other leak exists. Replace fuel pump.
See
FUEL PUMP MODULE
. |
| No |
REPLACE failed fuel injector(s).
See
FUEL INJECTORS
.
RESTORE vehicle.
RECHECK fuel pressure. |
| 6 |
CHECK PULSE DAMPER DIAPHRAGM
- Start engine and run engine for 10 seconds.
- Key OFF.
- Wait 10 seconds and then start engine and run engine for 10 seconds.
- Key OFF.
- Remove vacuum hose from fuel pressure regulator or pulse damper port.
- Inspect for fuel in the vacuum hose regulator port or pulse damper.
- Is the vacuum hose and regulator or pulse damper port free of fuel?
|
Yes |
REPLACE fuel pulse damper. |
| No |
Go to next step. |
| 7 |
CHECK FUEL SUPPLY LINE FOR RESTRICTION
- Observe Warning, Caution and Handling from FUEL SYSTEM
article.
- Disconnect fuel supply line at the fuel rail.
- Disconnect fuel supply line at the fuel pump.
- Check the fuel supply line for restrictions due to blockage, kinking, or pinching.
- Apply 21-34 kPa (3-5 psi) regulated shop air pressure to the supply line.
- Does air flow freely through the supply line?
|
Yes |
Air flows freely.
REPLACE fuel pump.
See
FUEL PUMP MODULE
. |
| No |
REPAIR cause of restriction.
RESTORE vehicle.
RECHECK fuel pressure. |