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.
Engine Control Module
| Item Number | Description |
|---|---|
| 1 | ECM and cooling fan mounting bracket |
| 2 | Cooling fan |
| 3 | Screw (2 off) |
| 4 | Nut (2 off) |
| 5 | ECM |
The engine control module (ECM) is installed in the passenger side protective box in the engine compartment, on a bracket attached to the engine bulkhead. The bracket also contains an electric cooling fan. The engine control module (ECM), which has an internal temperature sensor, controls the operation of the cooling fan. While the ignition is on, the cooling fan receives a power supply from the engine control module (ECM) relay in the engine junction box (EJB). When cooling is required, the engine control module (ECM) connects the cooling fan to ground.
The engine control module (ECM) has the capability of adapting its fuel and ignition control outputs in response to several sensor inputs.
The engine control module (ECM) receives inputs from the following:
- crankshaft position (CKP) sensor.
- camshaft position (CMP) sensors (4 off).
- engine coolant temperature (ECT) sensors (2 off).
- Knock sensors (4 off).
- manifold absolute pressure (MAP) sensor.
- mass air flow and temperature (MAFT) sensors (2 off).
- Throttle position sensor.
- Heated oxygen sensors (4 off).
- Accelerator pedal position (APP) sensor.
- Ambient air temperature sensor.
- fuel rail pressure (FRP) sensor. Refer to Fuel Charging and Controls .
- Engine cooling fan. Refer to Engine Cooling .
- Stoplamp switch. Refer to Anti-Lock Control - Traction Control .
- Speed control cancel/suspend switch. Refer to Speed Control .
- Oil level and temperature sensor. Refer to Engine .
- Fuel LP (low pressure) sensor. Refer to Fuel Tank and Lines .
- Fuel pump driver module. Refer to Fuel Tank and Lines .
The engine control module (ECM) provides outputs to the following:
- Electronic throttle.
- Main relay.
- Heaters elements of the heated oxygen sensors (4 off).
- Fuel injectors (8 off). Refer to Fuel Charging and Controls .
- Ignition coils (8 off). Refer to Engine Ignition .
- variable camshaft timing (VCT) solenoids (4 off). Refer to Engine .
- Camshaft profile switching solenoids (2 off). Refer to Engine .
- Variable intake system tuning valve. Refer to Intake Air Distribution and Filtering .
- evaporative emission (EVAP) canister purge valve. Refer to Evaporative Emissions .
- Engine starter relay. For additional information, refer to: Starting System .
- Engine cooling fan. Refer to Engine Cooling .
- Generator. For additional information, refer to: Generator and Regulator (V8 5.0L Petrol) .
- HP fuel pumps. Refer to Fuel Tank and Lines .
- Fuel pump driver module. Refer to Fuel Tank and Lines .
- DMTL (diagnostic module - tank leakage) (NAS only). Refer to Evaporative Emissions .
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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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