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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
·
Mass Air Flow (MAF) Sensor – 8 pin Connector
·
Electronic Throttle Control – 5 pin Connector
·
Manifold Absolute Pressure (MAP) Sensor – 3 pin Connector
·
Oxygen Sensors (2 total) – 4 pin Connectors
·
Knock Sensors (2 total) – 2 pin Connectors
·
Ignition Coils (8 total) – 4 pin Connectors
·
Crankshaft Position Sensor – 3 pin Connector
·
Accelerator Pedal Sensor – 6 pin Connector
·
Ignition Switch Input – 1 Wire
·
Fuel Pump Control – 2 Wires
·
Fuel Pump PWM Control and Shield - 3 wires
·
Battery Power (Stud at Fuse/Relay Center)
·
Cooling Fan Control – 2 Wires
·
Even Injectors and High Pressure Fuel Pump – 12 pin connector
·
Odd Injectors and Rail Pressure – 12 pin connector
·
Coolant Temperature and Oil Pressure – 5 pin connector
·
Two Stage Oil Pump, Cam Position and Cam Phaser – 8 pin connector
·
Generator – 2 pin connector
·
ECM (3 total) – 73 pin connectors
·
Fuel Line Pressure – 3 pin connector
·
Fuel Pump Power Module (FPPM) – 16 pin connector
·
Vehicle Speed Sensor – 2 pin Connector - not used with 8 speed automatic transmission
Optional Connections (Not required for operation)
Optional User Outputs Bulkhead – 12 pin Connector (12-way)
Malfunction Indicator Lamp (MIL) – 1 Wire
Assembly Line Diagnostic Link (ALDL) – 16 pin connector
Top of Travel Clutch Switch/Brake Switch – 2 wires, REQUIRED FOR 6-SPEED MANUAL TRANSMISSION.
Canister Purge Solenoid – 2 pin connector
Connections
Note: It may be easier to install the harness on the engine before installing the engine into the vehicle.
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).
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 (5 total) to the engine block using the 4 bolts provided, ensuring the connections are clean and secure, and attach
the fuel pump wires from the fuse/relay center FPPM to the power and groundside of the pump (this feed is fused and relay-controlled from the ECM).
Two ground eyelets should be attached under one bolt on the rear of the cylinder head.
For manual transmission applications, a pair of wires for connection to a top of travel clutch switch have been provided. Not to be confused with the
bottom of travel clutch switch or neutral safety clutch switch which prevents starter engagement without fully depressing the clutch. The top of travel
clutch switch is used to briefly disable fuel when the clutch is depressed which helps decelerate the engine and makes upshifting easier and quicker. A
compatible clutch switch will have two pins which provide a closed circuit when the clutch pedal is fully released and an open circuit as soon as the
clutch pedal is partially depressed.
LT1 Based Engine Control System
ALL INFORMATION WITHIN ABOVE
Date
BORDER TO BE PRINTED EXACTLY
03MY19
AS SHOWN ON 8.5 x 11 WHITE 16
POUND NON-BOND RECYCLABLE
02FE22
PAPER. PRINT ON BOTH SIDES,
EXCLUDING TEMPLATES. TO BE
UNITIZED IN ACCORDANCE WITH
GMCCA SPECIFICATIONS.
Rev 02FE22
Revision
Init Rel – Blake Nye
Revision – Blake Nye
PART No.
19418601
Auth
DR
Installation Instructions
Title
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LT1 Based Engine Control System
19418601
PART No.
SHEET
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SHEET 5 of 39
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