'93 LT1 PCM Pinout diagram
04-13-2008, 11:04 AM
#4
Cruising
Thread Starter
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.
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.
04-13-2008, 02:29 PM
#5
Le Mans Master
Member Since: Dec 2004
Location: Myrtle Beach SC
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St. Jude Donor '05-'06
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.....
04-13-2008, 09:43 PM
#6
Cruising
Thread Starter
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.
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
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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04-14-2008, 01:01 AM
#8
Burning Brakes
Member Since: Apr 2006
Location: Houston Texas
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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!
On the newer ones, just call em a PECM. Lighten up!
04-14-2008, 12:26 PM
#9
Cruising
Thread Starter
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)
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)
03-11-2012, 01:01 AM
#10
2nd Gear
Member Since: Mar 2012
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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
http://www.gearhead-efi.com/Fuel-Inj...mation-DA2-DA3
04-04-2021, 03:52 PM
#12
Lt1
[QUOTE=mechanic58;1565011380]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)[ Hola amigo como estas lo solucionaste tengo el mimo problema
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)[ Hola amigo como estas lo solucionaste tengo el mimo problema
04-04-2021, 06:19 PM
#13
Cruising
Thread Starter
03-31-2022, 08:57 AM
#14
Instructor
Thank you so much for posting this!!!!!!!
I've been messing with these little toys for about 14 years, I've owned lots of them and fixed many more.... I can't think of a reason you wouldn't need this information for some thing... right now I am trying to bypass the vats because I bought two of these 1993 beauties that someone lost the keys to.
Again thank you!!!!
I've been messing with these little toys for about 14 years, I've owned lots of them and fixed many more.... I can't think of a reason you wouldn't need this information for some thing... right now I am trying to bypass the vats because I bought two of these 1993 beauties that someone lost the keys to.
Again thank you!!!!
05-11-2022, 09:45 AM
#15
Instructor
Still trying to get one of these vette’s running... I have gone through 3 VATS bypass modules... the LED melts the whole thing... I still really haven't figured out what the PO did but when you first try to start the engine on one of them.... the fuel pump goes on.... yes this is a good thing.... except... it never goes off. turn the key off and remove it and the fuel pump just runs and runs until it runs the battery down.
so... back to the bypass module I am using the timers shop GM VATS bypass made in USA white, red, black, blue and green wire with a blue led.
This is a 1993 40th anniversary Corvette with a 6 speed...
I have ground to black and blue
keyed 12Volts to Red
White to pin 7 on the "computer" Brown connector(DarkGreen/While) (sometimes from the computer I can have2.9 volts here...sometimes I have 7 or 8 or 9 and sometimes (mostly) I have vehicle voltage
This is based on the directions from the people that make this.
I've been messing with these things since 2008 owned a 1986, 1987, 1992, and 1977 still have the 1977... anyhow I'm not new to this... and know sometimes what is supposed to work doesn't...
Any light that Anyone can shed on this sucker would very very much be appreciated.
so... back to the bypass module I am using the timers shop GM VATS bypass made in USA white, red, black, blue and green wire with a blue led.
This is a 1993 40th anniversary Corvette with a 6 speed...
I have ground to black and blue
keyed 12Volts to Red
White to pin 7 on the "computer" Brown connector(DarkGreen/While) (sometimes from the computer I can have2.9 volts here...sometimes I have 7 or 8 or 9 and sometimes (mostly) I have vehicle voltage
This is based on the directions from the people that make this.
I've been messing with these things since 2008 owned a 1986, 1987, 1992, and 1977 still have the 1977... anyhow I'm not new to this... and know sometimes what is supposed to work doesn't...
Any light that Anyone can shed on this sucker would very very much be appreciated.
