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Full Size Truck (FST)
Crankcase "dirty" air from
LH rear rocker cover to
intake manifold. PCV tube
in rocker cover has 2.7mm
metering orifice.
Power Brake Booster Vacuum Source:
The vacuum port for the Brake Booster is a plug in the rear of the intake
manifold. If you need the vacuum source for your brake system the plug
needs to be removed and you will need fitting #12559760 available from
any GM dealer.
Oil Pressure Sensor:
If your harness connector does not fit your oil pressure sensor, you must
change the oil pressure sensor that comes on the engine and install the
sensor provided in the kit. Tighten the sensor to 35 N·m (26 lb ft).
Engine Wiring Harness
The following lists the engine and vehicle side connections. Optional
circuits are described in the 'System Features' section below:
NOTE: A Malfunction Indicator Lamp (MIL- sometimes called a
"service engine soon" light) is mounted inside the fuse/relay
center. A redundant MIL output is also available in the harness near
the pedal module connector. It is recommended that a MIL also be
installed in a visible location in the passenger compartment. This
circuit requires any 12v low current light and an ignition 12v power
source. The ECM MIL output supplies the ground for the circuit.
Connections Required for Correct Operation
Coolant Sensor – 2 pin Connector
Mass Air Flow (MAF) Sensor – 5 pin Connector
Camshaft Position Sensor – 3 pin Connector
Electronic Throttle Control – 6 pin Connector
Manifold Absolute Pressure (MAP) Sensor – 3 pin Connector
Oxygen Sensors (2 total) – 5 pin Connectors
Knock Sensors (2 total) – 2 pin Connectors
Ignition Coil Blocks (2 total) – 8 pin Connectors
5.3L Crate Engine Control System
TITLE
Fuel Injectors (8 total) – 2 pin Connectors
Crankshaft Position Sensor – 3 pin Connector
Accelerator Pedal Sensor – 6 pin Connector
Ignition Switch Input (Wire) Wire
Fuel Pump Control (Wire) Wire
Engine Grounds (3 total) Eyelets
Battery Power (Stud at Fuse/Relay Center)
5.3L LC9 requires the provided Map Sensor Jumper Harness
Cooling Fan Control Wire
Clean air to crankcase from air
Engine Oil Pressure Sensor – 3 pin Connector
cleaner to RH front rocker cover.
Optional Connections (Not required for operation)
Alternator Control Connector
Vehicle Speed Sensor—2 pin Connector only required if CPP Connect &
Optional User Outputs Bulkhead – 12 pin Connector (12-way)
Connections
Connect all engine/vehicle-side connectors before connecting the
harness to the ECM. All engine/vehicle-side connectors are functionally
labeled, consult a service manual if necessary to determine connection
locations (see following service manual information).
NOTE: It may be easier to install the harness on the engine before
installing the engine into the vehicle.
The harness includes a fuse/relay center containing all required fuses
and relays, and also a 12-way bulkhead connector (with sealed mating
connector) which contains outputs that may be useful to the user (see
'Bulkhead Connector Outputs' section below). The fuse/relay center
should be mounted as high in the engine compartment as possible to
avoid unnecessary splash and road debris. Likewise, keep the 12-way
bulkhead connector and diagnostic link connector (both connect from
the fuse/relay center) as high and protected as possible.
The 3 ECM connectors are indexed to connect only in the correct
locations. Install by pressing down firmly until the connector is seated,
then pull the top slider bar down until it snaps and locks into place. The
bar should slide easily and will not move unless the connector is seated
properly, do not use excessive force.
Attach the harness ground eyelets (3 total) to the engine block, ensuring
the connections are clean and secure, and attach the fuel pump wire
from the fuse/relay center to the power side of the pump (this feed is
fused and relay-controlled from the ECM).
Make sure all intended engine and vehicle side connections have
been made before proceeding to connect power.
Attach a 12 volt ignition switch feed from the vehicle to the pink ignition
switch wire in the harness (this is required to enable the proper power-
up sequence of the ECM). This can be routed into the passenger
REV 28JN12
(19202598)
Cruise Transmission Controls is installed
Main Battery
Connection
19258097
PART NO.
Auxiliary Devices
- 50 amp fused
3
25
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