2004 Chevrolet Epica LSFACTORY OEM SERVICE PROCEDURE

Engine Controls Component Views

Fig 1: Identifying Ignition Coils, Injectors, and Heated Oxygen Sensor (HO2S) (Bank 1 and 2)
GM1469207Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Fuel Injector 1
2 Fuel Injector 2
3 Fuel Injector 3
4 Fuel Injector 4
5 Fuel Injector 5
6 Fuel Injector 6
7 Ignition Coil
8 Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
9 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
10 Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2
11 Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2
Fig 2: View Of Camshaft Position (CMP), Crankshaft Position (CKP), Engine Coolant Temperature (ECT) Sensors And EVAP Purge Solenoid Valve
GM1469209Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Camshaft Position (CMP) Sensor and Connector
2 Crankshaft Position (CKP) Sensor
3 EVAP Canister Purge Solenoid Valve
4 Engine Coolant Temperature (ECT) Sensor 2.5L
Fig 3: View Of Intake Air Temperature (IAT) Sensor, Throttle Body (MTIA), Exhaust Gas Recirculation (EGR) and Intake Manifold Tuning Valve (IMTV) Solenoid
GM1469210Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Intake Air Temperature (IAT) Sensor
2 Main Throttle Idle Actuator (MTIA)
3 Exhaust Gas Recirculation (EGR) Valve 2.5L
4 Intake Manifold Tuning Valve (IMTV) Solenoid
Fig 4: View Of Sirius D6 Engine Control Module (ECM)
GM1469212Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Engine Control Module (ECM) 2.5L
Fig 5: View Of Knock Sensors (KS) And Manifold Absolute Pressure (MAP) Sensor
GM1469213Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Manifold Absolute Pressure (MAP) Sensor
2 Knock Sensor (KS) and Connector
Fig 6: View Of Rough Road Wheel Speed Sensor
GM1469214Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Rough Road Wheel Speed Sensor (W/O ABS)
Factory Service Tools

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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.