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.
Diagnostic Procedure
1995 Saturn SL1 AutomaticSECTION Diagnostic Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1996 Saturn SW2, 1996 Saturn SW1, 1996 Saturn SL2, 1996 Saturn SL1, and 1996 Saturn SC2. However, it is still accessible from the selected car via links, so may be relevant.
- Using scan tool, monitor PNP switch display while moving shift selector lever. If lever position matches scan tool display, problem is intermittent. Check PNP switch adjustment. If lever position does not match scan tool display, go to next step.
- Inspect PNP switch and shift cable adjustment. Adjust as needed. See appropriate TRANSMISSION SERVICING - A/T article in TRANSMISSION SERVICING.
- Disconnect PNP switch 6-pin connector. If scan tool displays INVALID, go to step 6. If scan tool displays OPEN, go to step 4.
- Using jumper wire, connect in sequence terminals "A" thru "D" to ground while observing scan tool. Scan tool should change from OPEN to INVALID as each switch terminal is grounded. If scan tool display is correct as described, replace switch. If scan tool display is not correct as described, go to next step.
- Identify circuit(s) that did not display INVALID. Using ohmmeter, check continuity of circuit between PNP switch and PCM. Repair as needed. If circuit(s) is okay, replace PCM.
- Turn ignition on. Using DVOM, check voltage at terminals "A" thru "D" on PNP switch harness connector. If voltage exists on each terminal, replace PCM. If voltage does not exist on individual circuit, repair circuit as needed for open or short to ground. If circuit is okay, replace PCM.
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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.