6E1-234 DRIVEABILITY AND EMISSIONS
Action Taken When the DTC sets
• The ECM will turn ON the Malfunction Indicator
Lamp.
Conditions for Clearing the DTC
Once the ECM determines that a fault(s) has been
rectified then the CEL will switch OFF, although the
fault code will remain in the ECM memory.
Any fault codes will remain in ECM memory until -
1. They are cleared by disconnecting the Battery for
more than 30 seconds.
2. A service tool such as Tech 2 is used to clear them.
3. Ten consecutive starts without logging a fault.
Diagnostic Aids
An intermittent may be caused by a poor connection,
rubbed-through wire insulation, or a wire broken inside
the insulation. Check for the following items:
• Poor connection or damaged harness - Inspect the
ECM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal-to-wire connection, and
damaged harness.
• This malfunction detects a fuel pump relay short to
ground or disconnection.
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.
DTC (Flash DTC = 29)
Fuel Pump Relay Shorted To Ground
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. Read the “Caution” above.
2. Relieve the fuel system pressure and install the fuel
pump pressure gauge to the test fitting.
3. Use a scan tool to command the fuel pump ON.
Is there an immediate pressure build-up which indicates
the pump is running?
-
Go to Step 3 Go to Step 4
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