93-96 4G Colt / Summit / Mirage / Lancer 4G63T Engine Wiring Conversion

Disclaimer: all technical information in these pages is believed to be correct to the best of my knowledge. Some is based on specifications obtained from third parties, Chrysler or Mitsubishi workshop manuals, or otherwise from work I have verified or done myself. No liability or warranty is assumed or offered, and you use it all at totally your own risk.

Swapping the engine entails a lot of rewiring of the engine sensors and the ECU connectors. It's not a job for the technically challenged, but it can be done if you have the right information, which is the wiring schematics for your car and the 4G63T donor car. Note in the image above the repositioned battery, and the coolant overflow bottle slightly rotated so it fits next to the air cleaner. This cleaner is in this case a refurbished HKS product.

Summary: The 4G63T sensors and controls harness is joined to the existing harness at the center firewall in the engine bay. The 4G63T ECU board is swapped in the 4G ECU can and the can is fitted into the same place as it was previously. The 4G63T ECU has different connectors and the 4G harness has to have the standard connectors cut off and the new connectors joined to the harness. There's 8 - 10 new wires that have to be run from the 4G63T to the ECU.

Specifics:

Since your car has a wiring harness already, it makes sense to use it. While it's possible to use the entire 4G63 engine to ECU wiring (unravelled from the full harness), it's not a good idea because the Talon / Eclipse ECU is fitted to the center console, so many wires have to be cut and shortened anyway. Also, you have to cut and unravel the existing harness where it passes through the firewall, in an area that is very difficult to get at.

Mounting the Turbo Injector Resistors

Injector resistor pack mounting bracket.

The 1G turbo injectors are not directly driven like the original 4G15 / 4G93 engine. They each have a 10W resistor in line, and the resistor pack (shown left) is driven by +12V. There's two convenient M6 bolt holes on the firewall that are used to mount this custom U-channel bracket. The top one is currently used by the screen washer bottle, and the lower secures a wiring harness bracket. An M6-40 and a 30mm spacer are required for the lower bolt. The U-channel removes the need to drill holes and also provides a location for an equipment relay if needed.

Just visible below the resistor pack is the modified screen washer bottle.

4g63T Air Flow Sensor (4G15 Manifold Abs Air Pressure Sensor + Air Intake Temp Sensor)

4g63T Air Flow Sensor

The 4g63T air cleaner contains the Air Flow Sensor, sometimes also called the Mass Air Flow or MAF sensor. This is a Kharmann vortex type device and provides input for the ECU to calculate the air mixture.

You need to separate the cable to the air cleaner from the 4g63T harness, and it eventually reconnects at the centre firewall to the equivalent wires from the 4g15/4g93 harness.

  Note sensor in #1 to ECU pin #6: this requires a new wire to be added to the harness. See more notes below on how to do this.

4g15 MAP and IAT sensors

  

4G63T Idle Speed Control Actuator (4G15 Idle Air Control Motor)

<add diagrams and text>

 

4G63T Crank Angle and TDC Sensor (4G15 CKP, CMP Sensors)

<add diagrams and text>

 

4G63T Throttle Position Sensor and Idle Switch

<add diagrams and text>

 

4G63T and the MPI Relay

You DON'T need to replace the 4G MPI relay with the 1G Talon/Eclipse MPI. The only difference is that the Talon MPI relay has parallel solenoid coils for the relay that provides power to the fuel pump. Neither do you NEED the Talon fuel pump: the standard 4G pump is quite adequate for a standard 4G63T. The 1G pump can be fitted with some effort and fabrication, but this requires removing the fuel tank, which generally results in damage to the fuel lines (old rusty pipes and dammed tight connections) that has to be repaired.

Additional Wires required for Turbo

4G63T ECU

Function

Notes

C66-3

Turbo boost gauge driver

Put this if you intend to adapt the Talon gauge cluster.

nc

Oil pressure gauge

Put this if you intend to adapt the Talon gauge cluster.

C66-10

Air flow sensor

 

C66-15

EGR temp sensor

Only on California and many US models

C64-105

Wastegate solenoid driver

 

C66-9

Detonation Sensor

This device attatches to the sensor block under the intake manifold.

C65-57

Fuel Pressure Solenoid

 

 nc

Low coolant level

From sensor switch on thermostat housing. Only required if you intend to use the Talon gauge cluster or fit your own idiot light.

 nc

 

 

 

ECU Connector Cross-Reference

Both the 4g15 and 4g63T ECU's have three main connectors, but they are of different types. DO NOT cut the 4g15 connectors off: do it one wire at a time and double check you have the right ones or you'll take a lot longer trying to trace the wrong connection.

1G 4g63T

Description

4g15 cross reference

Notes

C66 -1

self diagnostic connector

B26-43

 

C66-2

self diagnostic connector

B26-42

 

C66-3

turbo boost gauge driver

nc

 

C66-4

O2 sensor check connector

B27-56

 

C66-5

Power steering oil pressure switch

B26-37

 

C66-6

turbo air flow sensor

nc

new wire required

C66-7

a/c coolant switch

B26-45

 

C66-8

air flow sensor

B27-52

 

C66-9

turbo detonation sensor

nc

new wire required

C66-10

air flow sensor

nc

new wire required

C66-11

turbo AWD control for ABS

not required

 

C66-12

IGN timing adjustment

B26-34

connector in engine bay

C66-13

fuel pump drive signal

nc

+12V from MPI relay pump power. new wire required. Leave this off and the ECU reports an Fuel Pump Error code. The link is missing from the '91 Talon workshop manual schematic.

C66-14

Idle switch

B27-67

on throttle body

C66-15

California EGR temp sensor

nc

new wire required

C66-16

air flow sensor

B27-70

 

C66-17

air flow sensor

B27-72 (link)

link to -24

C66-18

combo meter, needs sw to logic gnd

B27-66

 

C66-19

throttle position sensor

B27-64

 

C66-20

coolant temp sensor

B27-63

 

C66-21

crank angle sensor

B27-69

 

C66-22

TDC sensor

B27-68

 

C66-23

air flow sensor +5V logic power

B27-61

 

C66-24

air flow sensor logic gnd

B27-72

link to -17

 

1G 4g63T

Description

4g15 cross reference

Notes

C64-101

chassis ground

B25-26

linked to -104, -106

C64-102

main MPI relay power (+12v)

B25-25

 

C64-103

ECU battery backup power

B27-60

 

C64-104

chassis ground

nc

 

C64-105

Turbo waste gate solenoid

nc

new wire required

C64-106

chassis ground

B25-13

 

C64-107

main power from starter relay

B25-12

 

C64-108

starter relay power

B27-51

 

C64-109

IGN power transistor

nc

talon has wire in harness

C64-110

IGN switch

nc

run a 1.25mm cable

 

1g 4g63T

Description

4g15 cross reference

Notes

C65-51

injector #1

B25-1

 

C65-52

injector #2

B25-14

 

C65-53

California EGR, if installed

B25-6

 

C65-54

coil primary #1 xstr gate drive

B25-10

 

C65-55

coil primary #1 xstr gate drive

no equivalent

 

C65-56

MPI relay coil #2

B25-8

 

C65-57

nc

 

 

C65-58

idle speed actuator sink 2a

B25-4

 

C65-59

idle speed actuator sink 2b

B25-17

 

C65-60

injector #3

B25-2

 

C65-61

injector #4

B25-15

 

C65-62

purge control solenoid

B25-9

 

C65-63

MPI Relay coil #1

no equivalent

link to C65-66

C65-64

Check Engine Light sink

B25-36

 

C65-66

MPI Relay coil #1 input sensor

nc

link to C65-63

C65-67

Idle speed actuator sink 1a

B25-5

 

C65-68

Idle speed actuator sink 1b

B25-18

 

 


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