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 MANUALSSATURN1999SL2 AUTOMATIC, MP6REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1537-U1193DTC P1650/1651DTC P1650: CONTROL MODULE OUTPUT "B" CIRCUIT (4.0L "G" BODY & 4.6L "E" & "K" BODIES)DIAGNOSTIC PROCEDURES
1999 Saturn SL2 Automatic, MP6
Diagnostic Procedures
1999 Saturn SL2 Automatic, MP6SECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
- Start and idle engine. Using scan tool, select ENGINE 1 mode and note IGNITION 1 display. Compare this voltage reading with voltage reading displayed by vehicle message center. If PCM and vehicle voltage readings differ by greater than 1.5 volts, go to next step. If PCM and vehicle voltage readings are within 1.5 volts of each other, fault is not present. See DIAGNOSTIC AIDS .
- Using DVOM, check voltage between ground and PCM fuse. If PCM fuse voltage and scan tool displayed voltage reading difference is greater than 1.5 volts, go to next step. If PCM fuse voltage and scan tool displayed voltage reading are within 1.5 volts of each other, check charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
- Check for high resistance in ignition feed circuits to PCM. Repair as necessary. If circuits are okay, go to next step.
- Check terminal contacts at PCM harness connector C1. Repair as necessary. If terminal contacts are okay, go to next step.
- Replace PCM. Program replacement PCM using required equipment.
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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.