The numbers below refer to the step numbers on the diagnostic table.
Step
| Action
| Values
| Yes
| No
|
1
| Did you perform the Diagnostic System Check-Engine Controls?
| --
| Go to
Step 2
| Go to
Diagnostic System Check - Engine Controls
|
2
| Did you perform the
Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F)
?
| --
| 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 below 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.
- Connect the J 34730-1A
Fuel Pressure Gauge to the fuel pressure test port using
the J 42242
Fuel Pressure
Gauge Adapter.
- Turn ON the ignition.
- Energize the fuel pump with the scan tool.
- 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 with the fuel pump
running.
Is the fuel pressure within the specified range?
| 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 stabilize and remain constant within the specified
range?
| 240-275 kPa (35-40 psi)
|
Go to Step 7
| Go
to
Fuel System Diagnosis
|
7
|
- Connect the J 39021
Fuel Injector Tester, J 39021-210
Injector Switch Box and, J 39021-360
Injector Harness Adapter to the main fuel injector connector at
the rear of the plenum.
- Set the amperage supply selector switch on the fuel injector tester
to the balance test 0.5-2.5 amp position.
- Select the injector to be tested on the injector switch box.
- Turn the fuel pump ON then OFF using the scan tool 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 3-7 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.
Do any of the fuel injector have a pressure drop value that is either
more than the average pressure drop or less than the average pressure drop
by the specified value?
| 10 kPa (1.5 psi)
| Go to
Step 8
| Go to
Symptoms - Engine Controls
|
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.
Do any of the fuel injector still have a pressure drop value that is
either more than the average pressure drop or less than the average pressure
drop by the specified value?
| 10 kPa (1.5 psi)
| Go to
Step 9
| Go
to
Symptoms - Engine Controls
|
9
| Replace the malfunctioning fuel injectors. Refer to
Fuel Injector and Fuel Rail Replacement
.
Did you complete the replacement?
| --
| System OK
| --
|
