6E1-114 DRIVEABILITY AND EMISSIONS
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. If the fuel pump is operating but incorrect pressure
is noted, the fuel pump wiring is OK and the “Fuel
System Pressure Test” chart should be used for
diagnosis.
Caution: To reduce the risk of fire and
personal injury:
• It is necessary to relieve fuel system
pressure before connecting a fuel pressure
gauge. Refer to Fuel Pressure Relief
Procedure, below.
• A small amount of fuel may be released
when disconnecting the fuel lines. Cover
fuel line fittings with a shop towel before
disconnecting, to catch any fuel that may
leak out. Place the towel in an approved
container when the disconnect is
completed.
Fuel Pressure Relief Procedure
1. Remove the fuel cap.
2. Remove the fuel pump relay from the underhood
relay center.
3. Start the engine and alow it to stall.
4. Crank the engine for an additional 3 seconds.
Fuel Pressure Gauge Installation
1. Remove the shoulder fitting cap.
2. Install fuel pressure gauge 5-8840-0378-0 to the
fuel feed line located in front of and above the right
side valve cover.
3. Reinstall the fuel pump relay.
Fuel System Electrical Test
Step Action Value(s) Yes No
1
Was the “On-Board Diagnostic (OBD) System
Check” performed? -
Go to Step 2
Go to OBD
System
Check
2
1. Turn Ignition “ON”.
2. Install Scan Tool
3. Command Fuel Pump “ON”.
Did the Fuel Pump turn on?
-
Go to Fuel
System
Diagnosis Go to Step 3
3
1. Ignition OFF.
2. Remove the fuel pump relay.
3. Using a test light connected to ground, probe the
battery feed to the relay.
Did the light illuminate?
-
Go to Step 5 Go to Step 4
4
Repair short or open battery feed to fuel pump relay.
Is the action complete?
-
Verify repair
-
5
1. Connect a test light between the two wires that connect
to the fuel pump relay pull-in coil.
2. Ignition ON.
Did the test light illuminate for 2 seconds and then turn
off?
-
Go to Step 11 Go to Step 6
6
1. With a test light connected to battery (−), probe the fuel
pump relay connector at the wire which runs form the
relay pull-in coil to the ECM.
2. Ignition ON.
Did the test light illuminate for 2 seconds and then turn off?
-
Go to Step 7 Go to Step 8
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