Multec 3.5 Fuel Injector Application Manual Product Handling
Delphi Energy and Chassis Systems
Revision: 11/05-1 6-9
an opportunity to correct potential deficiencies before pilot and SOP
builds.
6.7 Maintenance, Service and Repair
6.7.1 Diagnosing Malfunction Codes
Should a Fuel Trim, Misfire, or Injector Circuit Fault Diagnostic Trouble
Code appear during any phase of testing, evaluate all factors that might
prove to be the root cause. These Trouble Codes may not indicate an
injector or system failure. On the contrary, the fuel trim diagnostics may
be responding properly, indicating a failure or irregularity elsewhere in the
engine or control system.
Note
Procedures for diagnosing Diagnostic Trouble Codes are specific to each
application.
If an injector is suspected of malfunction, perform the following
procedures:
• Perform a fuel system pressure test, injector pressure balance, and
electrical continuity checks.
• Before a leak check, pulse the injector to make sure the valve is
properly seated.
6.7.2 Replacement Techniques
The following procedure outlines standard Multec 3.5 Fuel Injector
removal and replacement.
1. Shut off ignition.
Warning
The injector and all associated hardware may be extremely hot.
2. Disconnect negative battery cable to avoid possible fuel discharge if
an accidental attempt is made to start the engine.
3. Disconnect the electrical connector from the injector wiring harness.
4. Relieve fuel pressure (refer to the appropriate service manual
procedure).
5. Remove the fuel rail assembly (refer to the appropriate service manual
procedure).
6. Remove the retaining clip from the fuel injector.
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