How to wire a 2g 4g63 engine

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4G63 wiring for an engine swap (2G Style)

• 1995-99 2G DSM 4G63 engine swap wiring schematic diagram (seen in image)

1995-99 4G63 wiring schematic diagram / schematic for a 2G DSM 4g63 engine.

4G63 MPI Relay (Connector B-87)

• The MPI relay distributes power to the 4G63 engine. If you wire it wrong, you will have problems like your fuel pump not turning on, ECU not powering up properly, etc.

• Unplug the MPI connector from the MPI relay and look straight into the pins at the end of the wiring connector. Wires away from you. Make sure the clip that locks the connector into the MPI relay is facing up.

The order of pins are:

12

34

• Pin 1 - Red Wire - This wire spiderwebs through the harness and goes to Pin 12 & Pin 25 at the ECU. It is also connected to:

Idle Speed Control Motor (Pin 2 & Pin 5)

Oxygen Sensor (Pin 1)

Mass Airflow Sensor (Pin 4)

Camshaft Position Sensor (Pin 3)

Crankshaft Position Sensor (Pin 3)

Injector Resistor (Pin 3)

• Pin 2 - Light Green Wire - This is a direct wire to Pin 38 at the ECU.

• Pin 3 - Red with Black Stripe Wire - This can be combined with MPI Pin 4 and connected to a 20A Fuse. The other side of this fuse should connect to the battery, giving it power all the time.

• Pin 4 - Red with Black Stripe Wire - This can be combined with MPI Pin 3 and connected to a 20A Fuse. The other side of this fuse should connect to the battery, giving it power all the time.

4G63 Fuel Injector Wiring

• #1 cylinder (Connector A-50) (front cylinder, closest to water pump)

Pin 1 - Red wire

Pin 2 - Green wire

• #2 cylinder (Connector A-56)

Pin 1 - Red wire

Pin 2 - Yellowfins with Black Stripe wire

• #3 cylinder (Connector A-61)

Pin 1 - Red wire

Pin 2 - Green with Yellow Stripe wire

• #4 cylinder (Connector A-93) (rear cylinder, closest to transmission)

Pin 1 - Red

Pin 2 - Green with Red Stripe wire

4G63 Power Transistor wires: (Connector A-92)

Unplug the power transistor connector and look straight into the pins at the end of the wiring connector. Wires away from you. Make sure the clip that locks the connector into the power transistor is facing up. The order of pins from left to right are:

12345678

• Pin 1 - Blue w/ Black stripe wire -> Goes to Pin 1 of Ignition Coil (Connector A-62)
• Pin 2 - Brown w/ Red stripe wire -> Goes to Pin 23 of ECU (Connector B-53)
• Pin 3 - Black wire -> Ground
• Pin 4 - White stripe wire -> Goes to Pin 31 at ECU (Connector B-54)
• Pin 5 - Empty
• Pin 6 - Black w/ white stripe wire -> Goes to Pin 3 of Ignition Coil (Connector A-62)
• Pin 7 - Black w/ Blue stripe wire -> Goes to Pin 10 of the ECU (Connector B-53)
• Pin 8 - Black w/ white stripe wire -> Goes to Engine Speed Connector (Connector A-59)

4G63 Oxygen Sensor (Connector B-26)

• Pin 1 - Red - Goes to pin 25 of the ECU (Connector B-53)
• Pin 2 - Black - Goes to Pin 92 at the ECU (Connector B-56) And Pin 2 of the Engine Coolant Temperature Sensor (Connector A-97) And Pin 4 of the Throttle Position Sensor (Connector A-63) And Pin 5 of the Mass Airflow Sensor (Connector A-102)
• Pin 3 - Yellow - Goes to pin 35 at the ECU (Connector B-54)
• Pin 4 - White - Goes to pin 76 at the ECU (Connector B-56)

Grounds the shields for the O2 Sensor wiresand the knock sensor wires.

More coming soon...