LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 1998 >> SC1 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls >> Pcm Power & Ground Check >> PCM Harness Resistance
April 5, 2026: LEMON Manuals is launched! Read the announcement.

PCM Harness Resistance

Turn ignition switch to LOCK position. Disconnect PCM and appropriate component harness connectors. Check for open or short circuits between PCM harness connector terminal and component harness connector terminal. See POWERTRAIN CONTROL MODULE (PCM)  table. See WIRING DIAGRAMS article. If harness is open or shorted, repair as necessary.

POWERTRAIN CONTROL MODULE (PCM) J1 CONNECTOR PINOUT (1)

Terminal Num. Circuit Num. Wire Color Description
C1 335 DK GRN Cooling Fan Relay
C2 1885 TAN/BLK Upshift Lamp
C3 419 BRN/WHT MIL
C4 172 YEL Low Fuel TT Out
C5 419 BRN/WHT MIL
C6 456 DK GRN Service Lamp (MANUAL ONLY)
C7 35 DK GRN Low Coolant/Hot Lamp
C8 1807A PPL Serial Data
C9 -- -- Not Used
C10 465 DK GRN/WHT Fuel Pump Relay
C11 603 LT BLU A/C Request
C12 439 PNK Ignition
C13 -- -- Not Used
C14 86B BRN Brake Switch
C15 1884 GRY Cruise Control Switch
C16 455 PPL/WHT Fuel Gauge Out
D1 729 GRY A/C Clutch Relay Control
D2 121 WHT Tachometer Output
D3 135 DK GRN Coolant Gauge Output
D4 1294A WHT EVO High
D5 1295A BRN EVO Low
D6 389 DK GRN Speedometer Output
D7 1886 PNK Cruise Control Move
D8 1807 PPL Serial Data (ABS)
D9 1446 DK BLU Programming Power
D10 553 LT BLU Perf/Norm Switch (A/T Only)
D11 1887 LT GRN Cruise Direction
D12 -- -- Not Used
D13 1140 ORN Battery
D14 1344A LT BLU RKE Enable/Disable
D15 416J GRY 5V Reference (Fuel Tank Pressure Sensor)
D16 452K BLK Ground
(1) See Fig 1
POWERTRAIN CONTROL MODULE (PCM) J2 CONNECTOR PINOUT (1)

Terminal Num. Circuit Num. Wire Color Description
A1 1746 PNK/BLU #3 Injector
A2 844 LT BLU/BLK #4 Injector
A3 1745 LT GRN/BLK #2 Injector
A4 1310 WHT Canister Vent Solenoid
A5 1456 BRN EGR Signal
A6 417 DK BLU TP Sensor Signal
A7 432 LT GRN MAP Sensor Signal
A8 472 TAN IAT Sensor Signal
A9 1749 LT GRN/WHT IAC "B" High
A10 444 LT GRN/BLK IAC "B" Low
A11 1748 LT BLU/BLK IAC "A" Low
A12 1747 LT BLU/WHT IAC "A" High
B1 428 DK GRN/WHT EVAP Canister Purge Solenoid
B2 1744 BLK #1 Injector
B3 410 YEL ECT Sensor Signal
B4 416B GRY MAP/EGR 5 Volt Reference
B5 474 GRY TP Sensor Feed 5 Volts
B6 451E BLK/WHT Ground
B7 423 WHT EST Cylinders 1 And 4
B8 406 ORN EST Cylinders 2 And 3
B9 551 TAN/WHT Ground
B10 697 LT BLU EGR Solenoid
B11 639A PNK EGR Recirculation
B12 1140A ORN Battery
(1) See Fig 2
POWERTRAIN CONTROL MODULE (PCM) J3 CONNECTOR PINOUT (1)

Terminal Num. Circuit Num. Wire Color Description
C1 -- -- Not Used
C2 -- -- Not Used
C3 -- -- Not Used
C4 68A YEL/BLK Coolant Level
C5 30 PPL Fuel Level In
C6 -- -- Not Used
C7 -- -- Not Used
C8 -- -- Not Used
C9 -- -- Not Used
C10 496 DK BLU Knock Sensor Input
C11 413B TAN Rear O2 Sensor Ground
C12 1668 PPL/WHT Rear O2 Sensor Signal
C13 413A TAN Front O2 Sensor Ground
C14 412 PPL Front O2 Sensor Signal
C15 401 PPL VSS Low
C16 452G BLK EGR Sensor Return
D1 452H BLK MAP Ground
D2 251 BLK/WHT Fuel Level Return
D3 633 BRN/WHT #4 Compression Signal
D4 -- -- Not Used
D5 -- -- Not Used
D6 -- -- Not Used
D7 890 DK GRN Fuel Tank Pressure Sensor Signal
D8 452M BLK ECT Ground
D9 251 BLK/WHT Fuel Tank Pressure Sensor Return
D10 452N BLK IAT Ground
D11 452J BLK TP Sensor Ground
D12 -- -- Not Used
D13 573 YEL Crankshaft Position Sensor (High)
D14 574 PPL Crankshaft Position Sensor (Low)
D15 400 YEL VSS High
D16 -- -- Not Used
(1) See Fig 3
POWERTRAIN CONTROL MODULE (PCM) J4 CONNECTOR PINOUT (1)

Terminal Num. Circuit Num. Wire Color Description
A1 -- -- Not Used
A2 422 TAN/BLK TCC Actuator
A3 1530 DK BLU Main Line Pressure Actuator
A4 -- -- Not Used
A5 898 PPL 4th Gear Actuator
A6 1223 YEL/BLK 3rd Gear Actuator
A7 1222 LT GRN 2nd Gear Actuator
A8 -- -- Not Used
A9 -- -- Not Used
A10 451F BLK/WHT Ground
A11 452T BLK Trans Temp Sensor Return
A12 -- -- Not Used
B1 -- -- Not Used
B2 773 GRY Shift Selector C
B3 772 YEL Shift Selector B
B4 771 BLK/WHT Shift Selector A
B5 776 WHT Shift Selector D
B6 -- -- Not Used
B7 -- -- Not Used
B8 586 ORN/BLK Trans Fluid Temp Sensor Signal
B9 551B TAN/WHT Ground
B10 1230 RED/BLK Turbine Shaft Speed Sensor (High)
B11 1231 DK BLU/WHT Turbine Shaft Sensor (Low)
B12 -- -- Not Used
(1) See Fig 4
Fig 1: J1 Connector Pinout Diagram
G50A16998Courtesy of GENERAL MOTORS CORP.
Fig 2: J2 Connector Pinout Diagram
G50B16999Courtesy of GENERAL MOTORS CORP.
Fig 3: J3 Connector Pinout Diagram
G50A16998Courtesy of GENERAL MOTORS CORP.
Fig 4: J4 Connector Pinout Diagram
G50B16999Courtesy of GENERAL MOTORS CORP.
scientia non olet · About LEMON Manuals