Step
| Action
| Values
| 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 Solenoid Coil Test
?
| --
|
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 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 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 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, the J 39021-210
injector switch box and the, 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 through 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.
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 injectors. Refer to
Fuel Injector and Fuel Rail Replacement
.
Is the replacement complete?
| --
| System OK
| --
|
