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.
1999 Saturn SC2 L4-1.9L DOHC VIN 7FACTORY OEM SERVICE PROCEDURE
Chart 3
Diagnostic Chart:
Wiring Diagram:
ENGINE CRANKS BUT WON'T START - (CHART 3 OF 4)
At this point in diagnosing a NO START condition it has been determined that the PCM inputs and the ignition system are OK. This chart will diagnose the fuel delivery system.
TEST DESCRIPTION
1. When the ignition is turned On the fuel pump relay should be energized for about two seconds. After connecting a fuel pressure gage the ignition may have to be cycled a few times before reaching the specified pressure. A Scan tool can also be used to prime the fuel system. If pressure is available but low it indicates the PCM and fuel pump relay circuit is OK.
2. The ignition must be Off for about 10 seconds before the fuel pump relay will be re-energized. If the test light illuminates at the fuel pump fuse the PCM control and relay are OK.
3. The PCM sends 12 volts to the relay coil.
Factory Service Tools
Use the Manual With the Right Hardware
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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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