Disclaimer: This is for a 97 T/A and cuurently all the wiring has been removed. I'm only wiring in the engine harness and trying to get power to everything for the car to run. There aren't any factory modules or relays currently being used, just tracing and pulling factory connectors/pigtails and wiring it up. I'm getting everything together and I'm starting to label the wires needed and hooking them up to fused power. I've got a few questions about what wires are needed and if the names are right.

Connector C100
H - Coolant Fan relay control (2 & 3)
J - Coolant Fan Relay Control (1)
Are these ground activated? What does the 1,2,3 designation mean?

Connector C105
B - Power Feed from Injector Fuse #10
I couldn't find an Injector Fuse #10, only Engine Fuse #10 in my Haynes manual. Is this a typo, if not what A rating does it need?

Connector C210
B - Ground feed to fuel pump relay
D - Feed from fuel pump and fuel pump relay to prime connector
I'm guessing that B is the important one. It ground activates my relays in the back of the car per the PCM, same way my BS3 was. What is D for and do I need it for the pump to work properly. Currently I have a dual Walbro setup in the tank with two relays. Primary is ground activated and the other 12V activated.

Connector C220
G - VSS
J - Fuel Pump Relay Control
K - Coolant Temp Feed
Can the VSS and Coolant Temp signal be used for aftermarket gauges? What is the factory voltage range for those sensors? Is J the fuel pump relay control I need and not the previous one on C210? Is C210 the ground and C220 the 12V switched source?

Connector C230
D - Tach signal
E - Theft Deterrent Fuel enable
Can the tach signal be used, same question as above. Does E need to have power applied to it so the PCM will continue to provide signal to the pump eventhough I disabled VATS?

 

Some answers for you:

C 100:
H and J : these are two grounds from the PCM to control a three relay array for the fans. You can look the circuit up at shoebox's place.
C 105B:
You need a 20A fuse here for the O2 sensor heaters (4 of them)
C 210:
B: just a ground for the fuel pump relay. All the PCM activated devices use common grounds from the engine.
D: This is a lead from your harness near the PCM to the fuel pump relay. It is used to power up the fuel pump and prime the fuel system when the ignition is off in 96-97 cars.
The fuel pump relay signal from the PCM is +12V from connector C220 J.

 

C 220:
G: This is a signal from the PCM for the speedometer. Dont know about aftermarket speedometers, have never installed one but i guess it can be used.
K: You can use this for your aftermarket temp gauge if you install the aftermarket sender in the driver side head and connect it to the corresponding connector.
J: answered in the above post

C 230:
D:You can use this for your aftermarket tachometer
E:You dont need this if you have disabled VATS in your PCM.

 

So the numbers correspond to the relays?

The injector fuse is a 15A #9, the page says Injector Fuse #10. I can't find injector #10. The only #10 is the engine fuse and it's a 20A.

So this is the ground activation wire for the pump?

So if the PCM uses a ground to activate the fuel pump relay then what is J used for? I already have power to the relay from the battery and a switched 12V to the relay so I don't need to hook up this wire?

 

Yes.

No, the pump relay is activated by the +12 signal from C220 J . this is just a ground from the engine harness to the relay to make sure there is no ground voltage difference between different PCM activated devices. The OEM pump relay is in the drivers side kick panel.

 

There was some conflicting (and erroneous) data in parts of the factory manual. Further investigation indicates that only one fuse is used for 96-97 injectors (rather than two in previous years). I have updated my C105 chart.

 

So for my 97 I don't need to supply power to it, or for 96-97 it needs power, but it's for something else besides the injectors?

 

I did open the '96 factory service manual to check this again. I am 99 % sure that 96-97 cars are identical. I have corrected my post.

C105 B is fed from fuse #10 (20A) and it supplies power to the four O2 sensor heaters and MAF. In a M/T car it also supplies power to the skip shift and reverse lockuout solenoids. In an A/T car it supplies power to the TCC/brake switch circuit(C230G)

C100 A is fed from fuse #9 (15A) and it supplies power to the 8 injectors.

 

Ok, if B on C105 is for Engine Sensor Fuse #10 20A for the O2 sensors, then that means that H on C230 is for the Rev. Lockout, Skip Shift and TCC.

 

No, according to the electrical diagrams in the FSM:


C230 H
M/T car:
Brown wire: feedig +12V from IP fuse #2 (15A) to the backup lamp switch in the transmission.
A/T car:
Lt blue/black: +12V from TCC interrupt switch on brake pedal.

 

Ok wish me luck. I stayed up last night and did a rough job of wiring everything up. I need to finish doing the DLC so I can put a laptop on it to make sure the PCM is getting power, but the engine turns over. One thing I didn't plan on doing was hooking up the fuel pump prime connector.

If I wanted to check to make sure the pump is going to prime I need to supply power to the prime connector via C210 D and then run then splice into the 12V power wire to the pumps? If I don't prime the pump the PCM will still turn the pump on via C220 J when the engine is cranking over, correct? What does the PCM look for, signal wise, to know when to turn on the pump? I think it looks for signals from the opti.

 

The pump will prime for about 2 seconds when the key is turned ON. If the key is not turned to start and the PCM does not see any opti signals, it will shut off.