Briggs & Stratton BIG BLOCK EFI, Repair Manual

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126 Section 5: Removal/Installation
4. See B of Figure 5-23. On cylinder 1 side of
engine, proceed as follows:
• Disconnect ECM J1 connector.
• Remove Phillips screw to release ECM
ground wire ring terminal from ECM/fuse
block bracket.
• Disconnect fuel injector connector.
• Disconnect ignition coil connector.
• Disconnect CKP sensor connector.
• Disconnect IAC connector.
5. See C of Figure 5-23. Proceed as follows:
• Disconnect TPS connector.
• Disconnect fuel pump module connector.
• Remove TORX screw to release EHT sen-
sor bracket from cylinder 1.
• Disconnect 2- and 6-place (or single
8-place) engine to chassis connectors.
• Disconnect starter solenoid ring and spade
terminals.
6. Remove two Phillips screws to remove air
block mounting plate.
7. See C of Figure 5-23. Feed wire harness
conduit and connectors up through air
block mounting plate opening.
8. Cut two cable straps around intake mani-
fold between air block mounting plate and
inside ignition coil mounting bosses. Re-
move EFI wire harness from engine.
Installation
1. Position new EFI wire harness at top of
intake manifold separating conduit and
connectors into three groups as shown in
Figure 5-23.
2. See C of Figure 5-23. Feed wire harness
connectors and conduit down through air
block mounting plate opening to area below
intake manifold.
3. See B of Figure 5-23. On cylinder 1 side of
engine, proceed as follows:
• Connect ECM J1 connector.
TPS
EHT Sensor
Ignition Coil
Cylinder 2
Fuel Injector
Cylinder 2
ECM J2
ECM J1
Fuse/Relay Block
MAP/MAT
Sensor
IAC
DLC
2-Place Socket
6-Place Socket
Starter Solenoid
Ring Terminal
Ground Wire
Ring Terminal
ECM Ground Wire
Ring Terminal
Starter Solenoid
Spade Terminal
CKP
Sensor
A
B
C
Fuel Pump Module
Fuel Injector
Cylinder 1
Ignition Coil
Cylinder 1
Tachometer/
Hourmeter/MIL
Figure 5-23 EFI Wire Harness for Models 540000/610000.