Vanguard BIG BLOCK M540000, Repair Manual, Page: 72 / 168

Wire Harness - EFI
The instructions for the removal of the wiring harness for
EFI engines can be used as a stand-alone instruction on an
assembled engine OR in conjunction with the disassembly
process of an engine.
If you are removing the engine wiring harness as a part of the
disassembly process, reserve the instructions to disconnect
the harness from various components until those components
are to be removed on the engine.
1. On cylinder 2 side of engine, see
A , Figure 82
and proceed as follows:
1. Remove fastener to release fuse block cover from
ECM/fuse block bracket.
2. Disconnect MAP/MAT sensor connector.
3. Disconnect fuel injector connector.
4. Disconnect ignition coil connector.
5. Remove fastener to release ground wire ring
terminal from cylinder boss.
6. Disconnect ECM J2 connector.
2. On cylinder 1 side of engine, see B , Figure 82
and proceed as follows:
1. Disconnect ECM J1 connector.
2. Remove fastener to release ECM ground wire ring
terminal from ECM/fuse block bracket.
3. Disconnect fuel injector connector.
4. Disconnect ignition coil connector.
5. Disconnect CKP sensor connector.
6. Disconnect IAC connector.
3. See C of Figure 82 and proceed as follows:
1. Disconnect TPS connector.
2. Disconnect fuel pump module connector.
3. Remove fastener to release EHT sensor bracket
from cylinder 1.
4. Disconnect 2- and 6-place (or single 8-place) engine
to chassis connectors.
5. Disconnect starter solenoid ring and spade
terminals.
4. Remove the 2 fasteners to remove air block mounting
plate. See Air Block Plate, Valley Air Guides, Speed
Control Bracket in this section.
5. Feed wire harness conduit and connectors up through air
block mounting plate opening.
6. Cut two cable straps around intake manifold between air
block mounting plate and inside ignition coil mounting
bosses.
7. Remove EFI wire harness from engine.
82
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