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.
1990 Eagle Premier ESFACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests
Select a section or procedure below to view factory instructions:
IntroductionControl Unit Harness TestCoolant Temperature Sensor TestCrankshaft Position/Engine Speed Sensor TestOxygen Sensor Heating Element TestManifold Absolute Pressure (Map) Sensor TestManifold Air Temperature (Mat) Sensor TestPark/Neutral Switch TestThrottle Position Sensor (TPS) TestVehicle Speed SensorB+ Latch, Fuel Pump & Ignition Relays TestStarter Relay TestIgnition Control Module TestFuel DeliveryFuel Injectors TestIdle Speed Regulator TestEGR Valve Solenoid TestEGR Valve TestEGR Vacuum Transducer TestFuel EvaporationPCVAir Temperature Sensor TestMiscellaneous Controls
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.