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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.
Make sure all intended engine and vehicle side connections have been made before proceeding to connect power.
NOTE: Pictures are reference only and may not reflect actual content.
Crank
Sensor
Knock
Sensor
Electronic
Throttle
Control
Coolant and
Oil PSI
Connector
2-Stage Oil
Pump, Cam
Position &
Cam Phasor
Connector
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
PAPER. PRINT ON BOTH SIDES,
EXCLUDING TEMPLATES. TO BE
UNITIZED IN ACCORDANCE WITH
GMCCA SPECIFICATIONS.
MAP
Connector
Odd Side
Injector and
Rail PSI
Connector
Knock
Sensor
IR 03MY19
Revision
Auth
Init Rel – Blake Nye
NA
Coil Connectors
Canister
Purge
Solenoid
Even Side
Injector and
High PSI
Fuel Pump
Connector
PART No.
19418601
DR
Installation Instructions
Title
LT1 Based Engine Control System
19418601
PART No.
MAP
Connector
Coil Connectors
SHEET
6 of 33
SHEET 6 of 33
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