HI guys,

I have a 2G chassis with a 2G ECU, with a 6 bolt (6 bolt cas) and I am doing a custom harness. I would like a sanity check on which sensors are required for it to run. So far, I have the following

Starting with connector B-53

Pin 1 - #1 Injector
Pin 2 - #2 Injector
Pin 3 - Empty
Pin 4 - Empty
Pin 5 - Empty
Pin 6 - Empty
Pin 7 - Unsure if needed
Pin 8 - Fuel Pump Relay
Pin 9 - Empty
Pin 10 - Ign. Coil Cylinder 1 & 4
Pin 11 - Mac Valve for SD Setup
Pin 12 - Power Supply
Pin 13 - Ground
Pin 14 - #3 Injector
Pin 15 - #4 Injector
Pin 16 - Empty
Pin 17 - Empty
Pin 18 - Empty
Pin 19 - Empty
Pin 20 - Cooling Fan Relay (High)
Pin 21 - Cooling Fan Relay (Low)
Pin 22 - Empty
Pin 23 - Ign. Coil for Cyl 2&3
Pin 24 - Empty
Pin 25 - Power
Pin 26 Ground

Connector B-54 - Running Custom Dash setup. No need for CEL, etc
Pins 31-46 - All Empty
Question: PIn 38: MFI Relay (Control) is this needed?

Connector B-55
Pin 51 - Empty
Pin 52 - Igniton Timing Adjustment Connector... Where does this go?
Pin 53 - Empty
Pin 54 - Empty
Pin 55 - Empty
Pin 56 - OBD Diag
Pin 57 - Empty
Pin 58 - Engine ignition signal... Where does this go?
Pin 59 - Empty
Pin 60 - Empty
Pin 61 - Empty
Pin 62 - OBD Data

Connector B56

Pin 71 - Igntion Switch - ST (I assume the ST means Start)
Pin 72 - Intake Air Temp Sensor
Pin 73 - MDP (now MAP sensor)
Pin 74 - Empty
Pin 75 - LC2 Wideband
Pin 76 - Empty
Pin 77 - Empty
Pin 78 - Knock Sensor
Pin 79 - 12 Pin Connector (Drag) What is this?
Pin 80 - Backup Power
Pin 81 - Sensor Impressed VOltage - What is this?
Pin 82 - Igntion Switch - IG (I assume the IG means Igntion On or Key On)
Pin 83 - Coolant Temp Sensor
Pin 84 - Throttle Position Sensor (The car had a 4-wire BBK Mustang TB on it when purchased) I believe it should be 3 wire.. Power, Ground, Signal) ?
Pin 85 - Barometric Pressure - Where does this go?
Pin 86 - Vehicle Speed Sensor
Pin 87 - Idle Switch (The current TB does not have one, But will chage TBs later)
Pin 88 - Cam Position Sensor (White wire on CAS Sensor, Pin 1)
Pin 89 - Crank Sensor ( Yellow wire on CAS Sensor, Pin 2)
Pin 90 - Volume Airflow Sensor (I assume this was MAF, If so, Deleted / Empty)
Pin 91 - Empty
Pin 92 - Sensor Ground

Thanks so much for any and all help and guidance. The build can be seen here: www.2gdsm.com will be posting updates soon.

I think you'll find having an ISC to be useful. (pins 4, 5, 17, 18)
DSMLink needs the factory MPI relay function. There is housekeeping it does during turn-off. (The normal delay before the ECU deactivated the MPI relay power via pin 38)
You may still want to connect the CEL Pin 36 to a light since you can program DSMLink to do other things with it.
Several of the other pins on that connector are used to tell the ECU there is a load on the engine for idle purposes.
Pin 58 is the ignition pulse from the factory PTU into the ECU.
You still need a front O2 signal on pin 76 even if it's simulated.
I think pin 79 is the programming pin for the later ECUs.
Pin 81 is the +5 Sensor Power.
Pin 84 is the TPS output. The power and ground come from 81 and 92.

Thanks!

1. I'll see what I can do with an ISC

2. The MPI Relay. Considering this is a completely custom harness - Which relay would be best, and method to wire it to Link?
1995-96 model years (MR161519)
1997-99 model years (MR224160)

3. The factory PTU is required? Where is it wired to / from? Pinout? - I have Dynatec ARC-2 CDI setup. Is this still needed?

4. The front 02 - The only 02 sensor installed in exhaust is the LC2 - Do I tap the feed from the gauge to go into both pins and then enable simulation?

5. TPS output? Output to.. where?

riopgtmn said:

Thanks!

1. I'll see what I can do with an ISC

2. The MPI Relay. Considering this is a completely custom harness - Which relay would be best, and method to wire it to Link?
1995-96 model years (MR161519)
1997-99 model years (MR224160)

3. The factory PTU is required? Where is it wired to / from? Pinout? - I have Dynatec ARC-2 CDI setup. Is this still needed?

4. The front 02 - The only 02 sensor installed in exhaust is the LC2 - Do I tap the feed from the gauge to go into both pins and then enable simulation?

5. TPS output? Output to.. where?

Click to expand...

Both of the MPI relay connector options are available. I don't know if one is more readily available than the other now.

If you are making a fresh wiring harness to trigger a CDI, the PTU isn't needed. I always tell people that the PTU adds a little more noise resistance, so leave it in if it is there. But I wouldn't go out of the way to add one to a harness. Keep in mind that not having the PTU changes the signal going to the ARC-2, so you will trigger on a different edge. And you should not use the install harness that is specific to the DSM, instead use a universal install harness, and you will need to run the tach output from the CDI back to the ECU. This goes to pin 58.

TPS Output refers to the output signal from the TPS. That goes to pin 84 on the ECU