Resolved Engine harness differences 1ga and 1gb

[theamsoilguy]

Hi. Im going to be ordering a wire harness connector kit from Magnus to rebuild the harness as its in really bas shape at the connectors. My car has been heavily butchered.....It started as a 1ga and a few motor swaps later and cut up harness In not sure now.

I believe that the CAS is different between a 1ga and 1gb and I can tell the difference there. Is there anything else different on the engine harness? I need to figure it out so I can order the parts. Im not positive about the coil connector and maybe there are more differences.

Thanks

 

[mitsubishikid]

You can pull your ecu out and see if it's part number indicates it's a "90 or "91-"94
Here are a few other things you can look for...

ISC on a "90 has the wires coming out of it going to a connector with pins, [on the "91-99 dsms connector pins are on the ISC housing.]

The ignition coil is a 4 pin square connector on a "90 dsm [on the "91-"99 dsms has a triangle 3 wire setup.]

The TPS on a "90 has wires coming out of it to a connector [on the 91-99 dsm the TPS has pins and a connector built into the sensor.]

On a "90 harness the cruise control motor and it's wire connector is by the positive battery cable, [on the 91-94 the cruise control unit is located on the firewall along with it's connector]

I happen to have both harnesses side by side at the moment so I know
also the little fuse box on the + battery cable is bigger on the 91-94 harness, it has places for 4 fuses, where as the "90 has only 3 slots for fuses.

 

[19Eclipse90]

The 1990 Engine Control Wiring Harness

...Connectors labeled with * are either completely different, in a different location, or non-existent on the later model 1Gs...
...connector differences that must be attended to when swapping a 1990 turbo engine control harness into a later model 1G or vice versa are denoted by **

*A-11: Auto-Cruise Control Actuator (black connector, square 4-pin)
...
*B-00: Noise Filter (for Tachometer) (black connector, stacked 2-pin)
*B-02 & B-05: Throttle Position Sensor and Idle Switch (black connector, square 4-pin)
**B-04: Idle Speed Control Actuator (black connector, rectangular 6-pin)
*B-14: Ignition Coil (Coil Pack) (black connector, square 4-pin)
*B-15: Power Transistor Unit (black connector, straight 6-pin)
*B-32: Crank Angle and Top Dead Center Sensor (Cam Angle Sensor, CAS) (black connector, square 4-pin)
...
**C-58: Control Wiring Harness and Body Wiring Harness Combination (white connector, 16-pin, passenger side kick panel)
**C-66: MPI Control Unit (ECU, large connector) (yellow connector, 24-pin)
**C-67: Control Wiring Harness and Body Wiring Harness Combination (under center console) (white connector, 8-pin)

The 4-slot fuse block on the positive battery terminal is only found in vehicles equipped with ABS. All 1991+ vehicles without ABS have the 3-slot fuse block. There was never a 1990 vehicle with ABS.