Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1998 Saturn SL1 AutomaticFACTORY OEM SERVICE PROCEDURE
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 | ||
|
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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 | ||
|
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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 | ||
|
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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 | ||
|
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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