Injector Balance Check
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
|
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.
- Connect the J 34730-1A fuel pressure gauge to the fuel pressure
test port.
- Turn on the ignition.
- Energize the fuel pump with the scan tool or by cranking the engine.
- Place the bleed hose of the fuel pressure gauge into an approved
gasoline container.
- Bleed the air out of the fuel pressure gauge.
- Observe the reading on the fuel pressure gauge.
Is the fuel pressure within the specified limits?
| 275-313 kPa (40-46 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
|
- Connect the 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 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 1st pressure reading.
- Depress the Push to Start Test button on the fuel injector tester
in order to energize the fuel injector.
- Record the fuel pressure that is indicated by the fuel pressure
gauge after the fuel pressure gauge needle has stopped moving. This is the
2nd pressure reading.
- Repeat steps 1 through 6 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 the malfunctioning fuel injector(s). Refer to the
Fuel Injector and Fuel Rail Replacement
procedure.
Is the replacement complete?
| --
| System OK
| --
|
