Section 07 ENGINE MANAGEMENT (DI)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
Otherwise, check the resistance of the direct in-
jector circuit.
Reconnect the injector and disconnect the AMP
connector number 4 on the MPEM.
Using a multimeter, check resistance value be-
tween terminals as follows.
COMPONENT TERMINAL LOCATION
Direct injector MAG
5 and 15
Direct injector PTO
6 and 21
The resistance should be between 1 and 1.6 .
If resistance value is correct, try a new MPEM.
Refer to MPEM REPLACEMENT procedures else-
where in this section.
If resistance value is incorrect, repair the wiring
harness/connectors between AMP connector and
direct injector.
Direct Injector Replacement
IMPORTANT: Do not remove direct injectors
needlessly. They are sealed with a carbon dam
thatmayexpandwhenpulledout. Aspecialtool
is required to compress it prior to reinstalling.
Otherwise, sealing efficiency might be affected.
Remove air/fuel rail retaining screws. Partially lift
rail to allow direct injector removal.
Disconnect direct injector connector then pull in-
jector out of cylinder head.
1
F12R0GA
2
1. Air/
fuel rail
2. Disconnect and pull injector out
Compress the carbon dam using tool (P/N 529 035
716).
Carefully install direct injector in cylinder head
paying attention to carbon dam insertion. Ensure
to position connector pointing toward bottom of
cylinder head.
NOTE: A thin film of injection oil may be applied
to carbon dam if necessary to ease insertion in
cylinder head.
Reconnect electrical connector.
F12R0HA
1
2
1. Carefully insert direct injector
2. Connector pointing toward bottom of cylinder head
Reinstall air/fuel rail.
Carbon Dam Replacement
Remove direct injector. See procedure above.
NOTE: When replacing a carbon dam, it is rec-
ommended to replace it on both injectors. It is
also recommended to replace all O-rings. When
servicing air/fuel rail or direct injectors, we recom-
mend replacing carbon dams that have been run-
ning for 50 hours or more.
CAUTION: Never reuse a carbon dam after it
has been removed from the injector. Always
install a new one.
Remove carbon dam and O-ring using a small pick.
Install seal guide (P/N 529 035 715) on end of injec-
tor. Carefully slide carbon dam in injector groove.
Use carbon dam compressor (P/N 529 035 716) to
compress carbon dam evenly.
smr2004-Complete Line Up 351
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