Engine Control Module: Application and ID

ENGINE CONTROL MODULE (ECM)
The ECM is located in the E-Box in the plenum area on the passenger side of the engine compartment attached to the bulkhead.

Inputs

The ECM receives inputs from the following:
- Central Junction Box (CJB)
- Engine Coolant Temperature (ECT) sensor
- Brake switch
- Manifold Absolute Pressure (MAP) sensor
- Accelerator Pedal Position (APP) sensor
- Throttle Position (TP) sensor
- Engine cooling fan speed
- Crankshaft position sensor (CKP) sensor
- Camshaft position (CMP) sensor
- Engine Oil Temperature (EOT) sensor
- Mass Air Flow (MAF) / Intake Air Temperature (IAT) sensor
- Knock sensors
- Cruise control switches (resistive ladders)
- Heated Oxygen sensors (HO2S)
- Vehicle speed (via CAN)
- Generator Monitor

Outputs

The ECM outputs to the following:
- Throttle actuator
- Ignition coils
- Oxygen sensor heaters
- Fuel injectors
- EGR valve
- Intake Manifold Tuning (IMT) valve
- Purge valve
- Fuel pump relay
- Starter relay
- Air conditioning condenser fan module (via CAN)
- EMS main relay
- Viscous fan control
- Generator control
- Power assisted steering
- Diagnostic Monitoring of Tank Leakage (DMTL)

The ECM controls engine fueling by providing sequential fuel injection to all cylinders. Ignition is controlled by a direct ignition system, provided by eight plug-top coils. The ECM is able to detect and correct for ignition knock on each cylinder and adjust the ignition timing to achieve optimum performance.

The ECM uses a torque-based strategy to generate the torque required by the driver and other vehicle control modules. The EMS uses inputs from various sensors to determine the torque required by the engine. These include:
- MAN sensor
- APP sensor
- EOT and ECT sensors
- HO2 sensors

Torque is then generated by using various actuators to supply air, fuel and spark to the engine (electronic throttle, injectors, coils, etc.). The ECM also interfaces with other vehicle control modules, via CAN, to obtain additional information. These include:
- ABS control module
- Transmission control module
- Transfer box control module