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.
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HOMESERVICE MANUALSCADILLAC1993SEVILLE BASEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - PCMPCM CODE CHARTSPCM CODE P039 - TCC ENGAGEMENT PROBLEM (4 OF 5)
1993 Cadillac Seville Base
Pcm Code P039 - TCC Engagement Problem (4 Of 5)
1993 Cadillac Seville BaseSECTION Pcm Code P039 - TCC Engagement Problem (4 Of 5)
NOTE:
Test number refers to number on diagnostic chart.
- This test checks for shift solenoids "A" and "B" or wiring fault. Refer to PCM VOLTAGE CHART table.
PCM VOLTAGE CHART
| PCM Terminal | Condition | Voltage |
|---|---|---|
| 1C4 | Brake Applied | 0-0.3 |
| Brake Released | Battery | |
| 3F6 | TCC Apply On | 0-0.3 |
| TCC Apply Off | Battery | |
| 3F5 | TCC Mod. On | 0-0.3 |
| TCC Mod. Off | Battery | |
| 3E10 | Shift Sol. "A" On | 0-0.3 |
| Shift Sol. "A" Off | Battery | |
| 3E4 | Shift Sol. "B" On | 0-0.3 |
| Shift Sol. "B" On | Battery | |
RENDER: 1.0x
NO RELATED
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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.