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.
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
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 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)
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 eeventually 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.
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>
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 the 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. 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 |
|
Copyright 2002-2007 Stewart DIBBS.