2004 GMC Envoy RWDFACTORY OEM SERVICE PROCEDURE

Engine Controls Component Views

Fig 1: Engine Controls Component Views
GM747443Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Throttle Actuator Control (TAC), Throttle Body
2 Intake Air Temperature (IAT) Sensor
3 Manifold Absolute Pressure (MAP) Sensor
Fig 2: Engine Controls Component Views - With Air Duct Removed
GM747446Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Ignition Coil #1
2 Ignition Coil #2
3 Ignition Coil #3
4 Ignition Coil #4
5 Ignition Coil #5
6 Ignition Coil #6
7 C104
Fig 3: Engine Controls Component Views, Left Front
GM747447Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Engine Coolant Temperature (ECT) Sensor
2 Engine Harness
3 PCM C1
4 PCM C2
5 Powertrain Control Module (PCM) C3
Fig 4: Engine Controls Component Views, Left Side
GM747448Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Crankshaft Position (CKP) Sensor
2 Knock Sensor (KS) 2
3 Knock Sensor (KS) 1
4 Evaporative Emission (EVAP) Canister Purge Solenoid
Fig 5: Engine Controls Component Views, Left Side
GM797470Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Engine Coolant Temperature (ECT) Sensor Connector
Fig 6: Engine Controls Component Views, Right Front
GM747451Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Camshaft Position (CMP) Sensor
2 Camshaft Actuator Solenoid Assembly
Fig 7: Engine Controls Component Views, Right Side
GM747452Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Heated Oxygen Sensor (HO2S) 1
Fig 8: Exhaust Pipe
GM747453Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Heated Oxygen Sensor (HO2S) 2
Fig 9: Automatic Transmission Component Views
GM747454Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Automatic Transmittion
2 Vehicle Speed Sensor (VSS)
Fig 10: Accelerator Pedal Position Sensor (APP)
GM747456Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Accelerator Pedal Position (APP) Sensor
Fig 11: Fuel Tank Component Views
GM747457Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Fuel Pump and Sender Assembly
2 Fuel Tank
3 Evaporative Emission (EVAP) Canister Vent Solenoid
4 Fuel Tank Pressure (FTP) Sensor
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.

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