Here we go again.....

2001 LS1 5.7L 4L60E four speed automatic

Removed pins and wires from Blue PCM connector....
23, 25, 28, 32, 65, 68 and 70

Removed pins and wires from Red PCM connector....
4, 7, 13, 34, 36, 37, 45, 53, 54 and 64

Bundle these wires together and route into the cab of vehicle.....

Blue 33 - Purple - TCC Brake Switch Signal - to brake switch - normal 12v positive and Zero
Volts when brake pedal is depressed .
Blue 34 - Orange/Black - Neutral Safety Switch
Blue 46 - Brown/White - Malfunction Indicator Light

Red 17 - Green/White - A/C request switch
Red 30 - Dk Blue - Fuel Enable Control - to VATS if not disabled in the PCM
Red 42 - Tan or Tan/Black - TCC Solenoid Valve Control
Red 50 - Green/White - Vehicle Speed Sensor Signal

Six fuse power block....

12V - Red - always "ON" from battery to three fused outlets

1. 30 amp 12V from fuse to terminal 87 for low fan relay
2. 30 amp 12V from fuse to terminal 87 for high fan relay
3. 10 amp 12V from fuse to PCM Blue 20 and 57

12V - Pink - from ignition "ON" switch to three fused outlets

1. 20 amp 12V from fuse to A/C relay terminal 87
2. 15 amp 12V from fuse to PCM Connector Blue 19
3. 15 amp 12V from fuse to Fuel Pump Relay terminal 87

Bosch Type Relay 1.
Low Speed Fan Relay
Terminal 85 connect to PCM Blue 42 - Dark Green
Terminal 30 Connect to Fan positive
Terminal 86 Connect to constant 12V Power Supply
Terminal 87 Connect to Switched 12V Power Supply

Bosch type Relay 2.
High Speed Fan Relay
Terminal 85 connect to PCM Red 33 - Dark Blue
Terminal 30 Connect to Fan positive
Terminal 86 Connect to constant 12V Power Supply
Terminal 87 Connect to Switched 12V Power Supply

Bosch type Relay 3.
Fuel relay
Terminal 85 connect to PCM Red 9 - Dark Green/White
Terminal 30 Connect to fuel pump 12V input
Terminal 86 Connect to Ground - black/white
Terminal 87 Connect to Switched 12V Power Supply

Bosch type Relay 4.
A/C relay
Terminal 85 connect to PCM Red 43 - Green/White - A/C Clutch Relay Control
Terminal 30 Connect to PCM Red 18 - Dark Green - A/C Compressor Clutch Supply Voltage
Terminal 87 Connect to switched 12V Power Supply
Terminal 86 Connect to PCM Blue 19 - Pink - Ignition 1 Voltage

My only concern is Relay 4. I don't see the logic there. It seems to me that Terminal 86 - Blue 19 - should have 12 Volts at the switch unless it is 12 Volts output from the PCM instead of input into the PCM. GM has always used the pink wire as switched power, red as constant 12V and Purple as the main starter solenoid lead.

 

Hello There,

I'm in the process of dropping an ls1 into my 82 Vette. I found the above information VERY useful, but I had a couple of questions/corrections. Isn't the tan wire going into the cab the oil pressure wire? The Tan/Black TCC Solenoid Valve Control connects to the Solenoid valve on the transmission itself. Also, Aren't terminals 86 and 87 mixed up on the fan relays? You list constant power going to 87 from the fuse block, but in the relays you list constant power as 86.

Please respond if anybody else agrees, before I start soldering these suckers together.

Thanks,
Dan

 

anyone have a picture schematic or link to a site with one?

 

...........A list of LS1 ECM with partnumbers would be cool too!