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 .
- Energize the fuel pump by connecting a fused jumper wire to the DLC (underhood) terminal Fp and B+.
- 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 value?
| 264-304 kPa
(38-44 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 the J 34730-3A fuel injector adapter and 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.
- Energize the fuel pump by using the scan tool.
- 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 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 fuel injector(s). Refer to
Fuel Injector and Fuel Rail Replacement .
Is the replacement complete?
| --
| System OK
| --
|
