Test Procedure
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?
| --
|
Go to Step 3
| Go to
Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F)
|
3
|
Important: Do not perform this test if engine coolant temperature is above 94C (201F)
With a scan tool, monitor the ECT parameter.
Does the ECT parameter measure less than the specified value
| 94°C (201°F)
|
Go to Step
4
| --
|
4
|
- Turn OFF the ignition.
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 J 34730-1A
Fuel
Pressure Gauge.
- Turn ON the ignition, with the engine OFF.
- With a scan tool, Command the fuel pump ON.
- Place the bleed hose of the fuel pressure gauge into an approved
gasoline container.
- Bleed the air out of the fuel pressure gauge.
Important: The fuel pump will run for approximately 2 seconds. Repeat Step
as necessary in order to achieve the highest possible fuel pressure.
- Use the scan tool to command the fuel pump ON.
- Use the fuel pressure gauge to observe the fuel pressure parameter.
Does the fuel pressure measure within the specified value?
| 333-376
kPa (48-55 psi)
|
Go to Step
5
| Go to
Fuel System Pressure Test
|
5
| After the fuel pump stops, the fuel pressure may vary slightly,
then should hold steady.
Does the fuel pressure remain constant within the specified value?
| |
Go to Step 6
| Go to
Fuel System Pressure Test
|
6
|
- Install the J 39021
Fuel Injector Coil/Balance Tester and J 39021-380
Fuel Injector Test Harness.
- With the fuel injector tester, select the 0.5-2.5 amp position.
- With a scan tool, command the fuel pump ON and then OFF.
- After the fuel pressure stabilizes, record the fuel pressure parameter
on the fuel pressure gauge . This is the 1st pressure reading.
- Press the PUSH TO START TEST button on the fuel injector tester.
- When the fuel pressure gauge needle stops moving, record the fuel
pressure parameter. This is the 2nd pressure reading.
- Repeat each remaining fuel injector.
- Subtract the 2nd pressure reading from the 1st pressure reading
for each fuel injector. The result is the pressure drop value.
- Record 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 7
|
Symptoms
|
7
| Replace
the faulty fuel injector(s). Refer to
Fuel Injector Replacement
Is the action complete?
| --
|
Go to Step 8
| --
|
8
| Does any Driveabilty condition still exist?
| --
| Go to Applicable
Diagnostic
| System OK
|
