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'93 LT1 PCM Pinout diagram

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Old 04-13-2008, 01:08 AM   #1
mechanic58
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Default '93 LT1 PCM Pinout diagram

I did search, couldn't find anything (here). I'm hoping someone here has this. Thanks in advance guys.
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Old 04-13-2008, 01:38 AM   #2
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http://www.autozone.com/az/cds/en_us...rInfoPages.htm
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Old 04-13-2008, 02:07 AM   #3
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The 93 does not have a PCM. What exactly are you looking for? ECM wiring diagram is in the FSM I believe.
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Old 04-13-2008, 12:04 PM   #4
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Thanks, I did find that one on the autozone site earlier. According to THAT drawing, it IS a PCM.

Also, I know those drawings are in the FSM, however I do not HAVE an FSM or else I wouldn'ta been on here askin this question. lol. Sheesh.

Thanks guys.
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Old 04-13-2008, 03:29 PM   #5
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Do you believe what Autozone tells you or someone has owned 2 '93s? PCM did not start till '94. You need the FSM for your car it will answer all your electrical questions. I have never heard anyone asking for a pin out of all the wires so I doubt you going to find a post on it. I did ask why you needed it though.....
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Old 04-13-2008, 10:43 PM   #6
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I have a complete LT1, harness and computer from a wrecked '93 Vette that I recently aquired. I have transformed the harness into a "essentials only" stand alone harness. I'm going to put this engine in a 1971 Pontiac Ventura with a muncie 4-speed behind it. Since I made my original post, I was able to locate the proper schematic and I have typed up my own 'pinout' description. Here it is below, now it'll be here for anyone else who might need this information.

Quote:
PINOUT for GM PCM/ECM 16159278 (wire color abr. follows descriptions)

Wire Color Legend
B = Black
BL = Blue
BR = Brown
DKBL = Dark Blue
DKG = Dark Green
GY = Gray
LBL = Light Blue
LG = Light Green
O = Orange
P = Purple
PK = Pink
R = Red
T = Tan
W = White
Y = Yellow

Connector [A] is Gray

[A1] Vapor Canister Purge Solenoid DKG/Y (HOT in start and run) 10A
[A2] EGR Solenoid B/PK (HOT in start and run) 10A
[A4] IAC LBL/W
[A5] IAC LG/B
[A6] Check Engine Light BR/W (this grounds when light is on, connect other terminal on light socket to HOT in start and run) 5A
[A7] Air Pump Relay BR
[A8] Air Divert Valve BR (this grounds when active, connect other terminal on valve to HOT in start and run) 10A
[A9] Shift Light W
[A10] IAC LBL/B
[A11] IAC LG/W
[A12] Ignition Coil W (HOT, connect other black wire on coil to ground) 10A
[A13] Coolant Temp Sensor Y
[A20] Fuel Pump ON input R
[A21] Trans Position Switch O/B
[A22] Anti-lock Brake Module GY/B

Connector [B] is Red

[B2] Trans Converter Clutch (Auto) or Overdrive Relay (Manual) T/B (Auto) or DKBL (Manual) (also connects to Pin F on ALDL Connector)
[B3] MAP Sensor B
[B4] Primary Cooling Fan Relay DKG/W
[B5] A/C System DKG/W
[B6] Grounded T (also connects to Pin A on ALDL connector)
[B10] Secondary Cooling Fan Relay DKBL/W
[B14] 2nd, 3rd and 4th gear switches (auto), 4th gear LBL
[B16] Cruise Control System P
[B17] Grounded B/W (jumped to [B6] )
[B18] TPS B
[B19] 2nd, 3rd and 4th gear switches (auto), 3rd gear DKG
[B20] 2nd, 3rd and 4th gear switches (auto), 2nd gear W
[B21] A/C system DKG/Y
[B22] Grounded B/W

Connector [C] is Green

[C1] A/C system DKG
[C2] TPS GY
[C3] PS DKBL
[C5] Distributor/Opti-Spark Module B/R
[C6] HOT at ALL times (jumped to C17) O
[C7] MAP Sensor GY
[C8] Knock Sensor(s) DKBL
[C9] Distributor/Opti-Spark Module B/PK
[C11] A/C Pressure Sensor GY/R
[C12] ECM Power (HOT in start and run) PK/B 3A
[C14] Distributor/Opti-Spark Module P/W
[C15] Oil Temp Sensor DKG
[C17] HOT at ALL times (jumped to C6) O
[C18] Distributor/Opti-Spark Module Y
[C21] MAP Sensor LG
[C22] Manifold Air Temp Sensor T

Connector [D] is Brown

[D1] VSS P
[D4] ALDL and Serial Data Connector T (connects to Pin M on ALDL connector)
[D6] O2 Sensor (left) P
[D7] Fuel Pump Relay DKG/W
[D8] VSS Output DKG/W
[D10] Fuel Injectors 2, 4, 6 & 8 DKG (connect other lead off injectors PK/B to HOT in start and run 10A)
[D11] Fuel Injectors 1, 3, 5 & 7 DKBL (connect other lead off injectors PK/B to HOT in start and run 10A)
[D12] VSS Y
[D15] ALDL and Serial Data Connector T
[D20] ALDL and Serial Data Connector W/B (connects to Pin B on ALDL connector)
[D22] O2 Sensor (right) P


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Old 04-13-2008, 10:54 PM   #7
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Well good luck with your project.
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Old 04-14-2008, 02:01 AM   #8
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ECM/PCM -they are just computers that control the electronic sensors. Some are reprogrammable on the car and some require being erased before reburning a new set of commands to them. Even C.A.T.S. Tuner software refers to them as ECM's.

On the newer ones, just call em a PECM. Lighten up!
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Old 04-14-2008, 01:26 PM   #9
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lol...PCM, ECM....its really a moot point for me. Semantics. The schematic that I had for this particular computer had it identified as the "Powertrain Control Module", hence the language I used to describe it. I really don't care WHAT it is called....lol.

Thanks again for all the help guys, I appreciate it. The guy with the Autozone link is what helped me the most. I still can't believe they had that schematic...lol. (and for the record, I have verified that it was in fact correct. The wire count, color code and pin locations were all correct for ECM 16159278)
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Old 03-11-2012, 03:01 AM   #10
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Little late but all the EFI wiring diagrams for that year are here:
http://www.gearhead-efi.com/Fuel-Inj...mation-DA2-DA3
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Old 03-11-2012, 04:44 AM   #11
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Just a TAD late...for sure.
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