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 MANUALSPLYMOUTH1994GRAND VOYAGER BASE, 31THREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 2.5L TBINO-START TESTSTEST NS-2A - INSPECTING FUEL SYSTEM
1994 Plymouth Grand Voyager Base, 31TH
Test NS-2A - Inspecting Fuel System
1994 Plymouth Grand Voyager Base, 31THSECTION Test NS-2A - Inspecting Fuel System
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
procedure in this article.
- Ensure throttle cables are not holding throttle open. If throttle is held open, repair as required. Perform TEST VER-1 . If throttle is not held open, read Throttle Position Sensor (TPS) voltage using DRB.
- If voltage is less than 1.5 volts, go to next step. If voltage is more than 1.5 volts, disconnect TPS connector. Inspect terminals. Repair terminals as required. Perform TEST VER-1. If terminals are okay, replace TPS. Perform TEST VER-1.
- If vehicle is not equipped with a factory vehicle theft alarm, go to next step. If vehicle is equipped with a factory vehicle theft alarm, read theft alarm status using DRB. If DRB displays FUEL ON, go to next step. If DRB does not display FUEL ON, see INTRODUCTION in TESTS W/CODES - BODY CONTROL COMPUTER article in ENGINE PERFORMANCE section.
- Using DRB, actuate fuel system. Listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, go to TEST NS-5A . If fuel pump operation can be heard, turn ignition off.
- Ensure fuel tank is at least 1/4 full. Release fuel pressure. Install a fuel pressure gauge in fuel supply line. Turn ignition on. Using DRB, actuate fuel system. Observe fuel pressure gauge. See FUEL PRESSURE SPECIFICATIONS table.FUEL PRESSURE SPECIFICATIONS
Application psi (kg/cm2 ) AN Body 11.5-17.5 (.8-1.2) AS Body 34-44 (2.4-3.1) - If fuel pressure is more than specification, go to TEST NS-4B . If fuel pressure is less than specification, go to TEST NS-4A . If fuel pressure is within specification, go to next step.
- Check fuel injector area for fuel flow. If fuel is flowing, go to TEST NS-4C . If fuel is not flowing, go to next step.
- If vehicle initially started and stalled repeatedly, go to TEST NS-7A . If vehicle did not initially start and stall repeatedly, go to TEST NS-3A.
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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.