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.
2004 Chevrolet Optra (CANADA) L4-2.0LFACTORY OEM SERVICE PROCEDURE
Powertrain Management: Locations
Engine Controls Component Views
Manifold Absoulte Pressure (MAP), Oil Pressure, Throttle Position (TP) Sensors
1 - Manifold Absoulte Pressure (MAP) Sensor
2 - Engine Oil Pressure Switch
3 - Throttle Position (TP) Sensor
4 - Idle Air Control (IAC)
Fuel Injectors, Heated Oxygen Sensor (HO2S) 1, Heated Oxygen Sensor (HO2S) 2, Idle Air Control (IAC) Valve, Intake Air Temperature (IAT) Sensor
1 - Fuel Injector 1
2 - Fuel Injector 2
3 - Fuel Injector 3
4 - Fuel Injector 4
5 - Heated Oxygen Sensor (HO2S) 1
6 - Heated Oxygen Sensor (HO2S) 2
7 - Idle Air Control (IAC) Valve
8 - Intake Air Temperature (IAT) Sensor
Crankshaft Position (CKP) Sensors, EVAP, Ignition Coils
1 - Evporative Emissions (EVAP) Canister Purge Solenoid Valve
2 - Crankshaft Position (CKP) Sensor
3 - Ignition Coil Modules
Engine Control Module (ECM), Engine Coolant Temperature (ECT), Camshaft Position (CMP) and Rough Road Sensors
1 - Engine Control Module (ECM)
2 - Engine Coolant Temperature (ECT) Sensor
3 - Camshaft Position (CMP) Sensor
4 - Rough Road Sensor
Exhaust Gas Recirculation (EGR) Valve, Knock Sensor (KS)
1 - Exhaust Gas Recirculation (EGR) Valve
2 - Knock Sensor (KS)
Fuel Vapor Recovery System
1 - Fuel Tube
2 - Fuel Filler Cap
3 - Fuel Tank
4 - Service Port
5 - Fuel Pipe to Fuel Rail
6 - Evaporative Emissions (EVAP) Canister Purge Solenoid Valve
7 - Vacuum hose to Intake Manifold
8 - Evaporative Emissions (EVAP) Canister
9 - Evaporative Emissions Canister Vent Solenoid Valve
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.
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