500SEC (140.070) V8-5.0L (119.970) (1993)
Module Box
LOCATION AND I.D.
The control module (N3/1) is located in the module box in engine compartment, passenger side firewall. The control module connector is color
coded dark green/light green.
Injection Control
OPERATION
The ECU contains several programs and functions which are briefly described below.
The ECU uses the following information:
^ Voltage supply (+)
^ Starter circuit
^ Engine temperature from coolant temperature sensor (B11/2)
^ Intake air temperature from intake manifold temperature sensor (B17/7)
^ Intake air mass from air mass sensor (B2/2)
^ Various information from the controller area network (CAN)
^ ABS/ASR information from ABS/ASR control module (N30/1)
^ Air/fuel mixture from oxygen sensor (G3/2)
^ ON signal for air injection
^ ON signal for exhaust gas recirculation (EGR)
CONTROL FUNCTIONS
Injection Base Quantity (Normal Driving) Function
During normal driving, the ECU uses the input devices to regulate injection frequency and timing. The two most influencing components are:
^
Air mass sensor with hot-wire (B2/2)
^
Engine RPM signal (TN)
Start And Warm-up Function
The start control provides for longer injection duration to enrich the mixture. The final air/fuel mixture is dependent on the engine coolant
temperature. Mixture enrichment stops when the engine is at operating temperature.
Acceleration Function
During acceleration a richer air/fuel mixture is provided to achieve maximum engine power. This will also keep combustion heat and catalytic
converter temperature at an acceptable level.
Deceleration Shut-off Chart
Deceleration Shut-off Function
During deceleration, the fuel injectors are turned off (in all gears) if engine temperature is above 70 °C (158 °F). The engine speeds for injection