[greeen01civic4d]

drew, was it u that was on unique whips??

[drew22mader]

Yea it was me

[MarchMadnessisM]

yea i agree this is what forums are all about this is great stuff n this better be put on DIY because this stuff is gold man but good luck with the trouble shooting

[greeen01civic4d]

how was that btw

[speedfoos]

The GM sensor is an aftermarket 3 BAR MAP sensor (made by GM) that you run to the PCS (or whichever EMS) instead of using the stock MAP sensor. They both stay plugged into the vac system - stock MAP hole is a pain to plug - but you have to disconnect the clip for the stock sensor (I realize this now).

Most EMS's will take the signal from a 3 BAR MAP, use that to determine where the engine needs to be on the AFR tables, and continue sending stock MAP readings to the ECU so it thinks everything is happy and stock. The stock MAP sensor pukes on boost so you either need to bypass it or replace it.

DIY, boy, ummm, I guess I could condense this at a later date into a DIY, but let me get this thing running right first.

I'm going to grab a cup of coffee and then head out to the garage for today's festivities!

[speedfoos]

OK here we go.

The brains of your car. Although my brain is definitely bigger, this one doesn't have as many burnt relays. In fact it doesn't have any that I can see. So that's good. Laptop is in the garage so you guys get up-to-the-minute updates.

Item 1 to troubleshoot checked off the list.

[speedfoos]

GhEtTo beLt Yo! RePraSeNtin' KaNSas Ya'LL!

That's a polypropylene sock. Yes Dad, that's one of the original you bought for me when I was 12 or 13! He reads the forum too! Off to check the instrument cluster and extra gauge wiring.

[speedfoos]

Under dash aftermarket gauge wiring looks good. Time to pull the center console and gauge cluster to make sure everything is good there.

[speedfoos]

Does anyone have a listing of the D17A2 ECU pinouts?? Andyman used to but he pulled all of his DIYs back in April. Muchos appreciation to anyone who finds an accurate one. I'm searching my ass off right now to try and find one.

[DaRk_MauL]

here ya go.

Connector A (31 Pins)
1-blk/wht-Primary O2 sensor heater control
2-yel/blk-Power Source
3-yel/blk-Power source
4-blk-Power ground
5-blk-Power ground
6-wht-Primary O2 sensor
7-blu-Crankshaft position
8-yel-Sensor return volt
9-red/blu-Knock sensor
10-grn/yel-Sensor ground
11-grn/wht-Sensor ground
12-blk/red-Idle air control valve
13-wht/blk-EGR Valve position VTEC ONLY
14-blk/wht-Secondary O2 sensor heater control
15-red/blk-Throttle position sensor
18-wht/grn-Vehicle speed sensor
19-grn/red-MAP Sensor
20-yel/blu-Sensor Voltage Supply
21-yel/red-Sensor Voltage Supply
23-brn/yel-Logic ground
24-brn/yel-logic ground
25-wht/red-Secondary O2 Sensor
26-grn-Top dead center sensor
27-brn-Igniton coil 4
28-wht/blu-coil 3
29-blu/red-coil 2
30-yel/grn-coil 1

Connector B (24 Pins)
2-yel-Fuel injector 4
3-blu-Injector 3
4-red-Injector 2
5-brn-Injector 1
6-grn-Radiator fan control
7-red/blk-A/T Pressure control solenoid valve A
8-red/wht-Engine Coolant sensor
9-blu/blk-VTEC Oil pressure switch VTEC ONLY
10-wht/blu-Alternator L Signal
13-wht/red-Alternator FR Signal
14-blu/red-EGR Valve VTEC ONLY
15-grn/yel-VTEC Solenoid valve
16-blk/red-A/T Pressure control solenoid valve B
17-red/yel-Intake air temp sensor
18-wht/grn-Alternator control
21-yel/blu-EVAP Canistor purge valve

Connector E (31 pins)
1-grn/yel-Immobilizer fuel pump relay
2-wht/red-Secondary O2 Sensor EX Only
3-brn/yel-Logic ground
4-pnk-Sensor ground
5-yel/blu-Sensor voltage source
6-blk/wht-Secondary O2 sensor heater control EX Only
7-red/yel-PGM-FI main relay 1
9-yel/blk-Ignition input signal
12-blu/orn-Cruise control signal
13-wht/blu-Interlock control unit
14-lt grn-Fuel tank pressure sensor
15-grn/red-Electrical load detector
16-lt grn/blk-Power steering pressure switch
18-red-A/C Clutch
20-blu/red-EVAP bypass solenoid valve
21-lt grn/red-EVAP Canister shut valve
22-wht/blk-Brake pedal position switch
23-lt blu-K line
24-yel-Multiplex control unit comm line
26-blu-Engine speed pulse
27-red/blu-Immobilizer code
29-brn-Service check signal
30-red/wht-Write enable signal
31-grn/orn-MIL or check engine light enable

[speedfoos]

I saw that, but shouldn't it have two RPM wires? One going in from the bay and then one going out to the gauge cluster? I'm trying to trace the one in the bay down to see where it goes and where it actually ties to pull the signal.

[speedfoos]

I think I understand. ECU processes the RPM signal from coil 1, 2, 3, or 4 (or uses all of them for error-checking purposes), and then sends the signal OUT via pin 26 on the E (top) connector. And it sends it out to the tach and the other signal wire. Hopefully I didn't fry things when I tied the signal back in to the system, but I shouldn't have.

I'm going to try just running the signal into the PCS - disconnecting the PCS RPM feed from the stock harness - and see what happens.

After I put this mess back together that is.....

[WilmncChris]

Well here is what i would do..take the pcs harness and check all the wires to make sure you are getting a signal. Do a Ohms check on all of the wires in the harness.

[speedfoos]

Good idea. I'm going to try this first. Reason being is that I took the PCS out of the loop last night, and started it with just the stock ECU and still didn't get a reading off the tach. Makes me think its somewhere in the loom. Now whether it's off one of the coil packs or what, I don't know. I've got a spare set (one of which is bad, don't know which one) that I'll start swapping out to see if that's the problem too.

Looks ready to start, no?

[WilmncChris]

Holly shit you have got a mess on your hands