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
| Was the Fuel Injector Coil Test Procedure performed?
| --
|
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 above the specified value?
| 94°C (201°F)
|
Go to Step 4
|
Go to Step
5
|
4
| Allow the engine to cool below the specified value.
Is the engine coolant temperature below 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. Refer to
Fuel Pressure Gage Installation and Removal
.
- Turn the ignition switch ON and then OFF, 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.
- Turn the ignition switch ON and then OFF, in order to energize
the fuel pump again.
- Observe the reading on the fuel pressure gauge.
Is the fuel pressure within the specified value?
| 250-300 kPa
(36-43 psi)
|
Go to Step
6
| Go to
Fuel System Diagnosis
|
6
| Turn OFF the fuel pump.
Does the fuel pressure remain constant?
| --
|
Go to Step 7
| Go to
Fuel System Diagnosis
|
7
|
- Disconnect the fuel injector electrical connectors.
- Connect the J 34730-3A fuel injector adapter to the injector
test leads of the J 39021 fuel injector tester.
- Connect the J 39021 fuel injector tester power leads to
B+ and ground.
- Set the amperage supply selector switch on the fuel injector tester
to the Balance Test 0.5-2.5 amp position.
- Connect the J 39021 fuel injector tester to a fuel injector.
- Turn the ignition switch ON and then OFF, in order to energize
the fuel pump.
- Record the fuel pressure indicated by the fuel pressure gauge
after the fuel pressure stabilizes. This is the 1st 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 2nd pressure
reading.
- Repeat steps 5 through 9 for each fuel injector.
- Subtract the 2nd pressure reading from the 1st 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 any faulty fuel injector(s). Refer to
Fuel Injector and Fuel Rail Replacement
.
Is the replacement complete?
| --
| System OK
| --
|
