Test Procedure
Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?
| --
|
Go to Step 2
| Go to
Powertrain On Board Diagnostic (OBD) System Check
|
2
| Did you perform the Fuel Injector Coil Test Procedure?
| --
|
Go to Step 3
| Go to
Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F)
|
3
| Is the engine coolant temperature
more than the specified value?
| 94°C (201°F)
|
Go to Step 4
|
Go to Step 5
|
4
| Allow the engine
to cool to less than the specified value.
Is the engine coolant temperature less than the specified value?
| 94°C (201°F)
|
Go to Step 5
| --
|
5
|
Caution: Wrap a shop towel around the fuel pressure connection in order to reduce
the risk of fire and personal injury. The towel will absorb any fuel leakage
that occurs during the connection of the fuel pressure gage. Place the towel
in an approved container when the connection of the fuel pressure gage
is complete.
- Install the fuel pressure gauge.
- Use a scan tool in order to energize the fuel pump.
- Place the bleed hose of the fuel pressure gauge into an approved
gasoline container.
- Bleed the air out of the fuel pressure gauge.
- Use the scan tool in order to pressurize the fuel system.
- Wait for the fuel pressure to build.
Important: The fuel pump will run for approximately 2 seconds. Repeat Step 5
as necessary in order to achieve the highest possible fuel pressure.
- Observe the reading on the fuel pressure gauge.
Is the fuel pressure within the specified range?
| 333-376 kPa (48-55 psi)
|
Go to Step 6
| Go to
Fuel System Diagnosis
|
6
| Turn the fuel pump off.
Does the fuel pressure remain constant?
| --
|
Go to Step 7
| Go to
Fuel System Diagnosis
|
7
|
- Connect a J 39021
fuel injector tester to a fuel injector.
- Set the amperage supply selector switch on the fuel injector tester
to the Balance Test 0.5-2.5 amp position.
- Turn the fuel pump on and then off in order to pressurize the
fuel system.
- Record the fuel pressure indicated by the fuel pressure gauge
after the fuel pressure stabilizes. This is the first pressure reading.
- Energize the fuel injector by depressing the Push to Start Test
button on the fuel injector tester.
- Record the fuel pressure indicated by the fuel pressure gauge
after the fuel pressure gauge needle has stopped moving. This is the second
pressure reading.
- Repeat Step 1 through Step 6 for each fuel injector.
- Subtract the second pressure reading from the first pressure reading
for one fuel injector. The result is the pressure drop value.
- Obtain a pressure drop value for each fuel injector.
- Add all of the individual pressure drop values. This is the total
pressure drop.
- Divide the total pressure drop by the number of fuel injectors.
This is the average pressure drop.
Does any fuel injector have a pressure drop value that is either higher
than the average pressure drop or lower than the average pressure drop by
the specified value?
| 10 kPa (1.5 psi)
|
Go to Step
8
| Go to Symptoms
|
8
|
Notice: Do Not repeat any portion of this test before running the engine in
order to prevent the engine from flooding.
Re-test any fuel injector that does not meet the specification.
Refer to the procedure in Step 7.
Does any fuel injector still have a pressure drop value that is either
higher than the average pressure drop or lower than the average pressure drop
by the specified value?
| 10 kPa (1.5 psi)
|
Go to Step 9
| Go to Symptoms
|
9
| Replace the faulty fuel injector(s). Refer to
Fuel Injector Replacement
Did you complete the repair?
| --
| System OK
| --
|
