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.
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HOMESERVICE MANUALSHONDA1994DEL SOL L4-1.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONOTHER CONTROL FUNCTIONS
1994 Honda Del Sol L4-1.5L SOHC
Other Control Functions
1994 Honda Del Sol L4-1.5L SOHCSECTION Other Control Functions
Starting Control
When the engine is started, the Engine Control Module (ECM) provides a rich mixture by increasing Fuel Injector duration.
Fuel Pump Control
^ When the ignition Switch is initially turned on, the ECM supplies ground to the Main Relay that supplies current to the Fuel Pump for two seconds to pressurize the fuel system.
^ When the engine is running, the ECM supplies ground to the Main Relay that supplies current to the Fuel Pump.
^ When the engine is not running and the ignition is on, the ECM cuts ground to the PGM-FI Main Relay which cuts current to the Fuel Pump.
Fuel Cut-off Control
^ To improve fuel economy, current to the Fuel Injectors is cut off during deceleration with the throttle valve closed, at speeds over 914 rpm, in no-load conditions in which the headlights, blower fan, rear defogger, radiator fan and air conditioner are not operating.
^ Fuel cut-off action also takes place when a maximum engine speed of 6,650 rpm is exceeded, regardless of the position of the throttle valve, to protect the engine from over-revving.
A/C Compressor Clutch Relay
When the ECM receives a demand for cooling from the air conditioning system, it delays the compressor from being energized, and enriches the mixture to assure smooth transition to the A/C mode.
Evaporative Emission (EVAP) Purge Control Solenoid Valve
When the engine coolant temperature is below 75°C (167°F), the ECM supplies a ground to the EVAP Purge Control Solenoid Valve which cuts vacuum to the EVAP Purge Control Diaphragm valve.
Alternator Control
The system controls the voltage generated at the alternator in accordance with the electrical load and drive mode, which reduces the engine load to improve the fuel economy.
Lock-up Control Solenoid Valve (A/T)
The vehicle speed and throttle position sensor inputs to the ECM are used to send an on/off voltage signal to the Lock-up Control Solenoid Valve for precise timing of the Torque Converter Lock-up System.
When the engine is started, the Engine Control Module (ECM) provides a rich mixture by increasing Fuel Injector duration.
Fuel Pump Control
^ When the ignition Switch is initially turned on, the ECM supplies ground to the Main Relay that supplies current to the Fuel Pump for two seconds to pressurize the fuel system.
^ When the engine is running, the ECM supplies ground to the Main Relay that supplies current to the Fuel Pump.
^ When the engine is not running and the ignition is on, the ECM cuts ground to the PGM-FI Main Relay which cuts current to the Fuel Pump.
Fuel Cut-off Control
^ To improve fuel economy, current to the Fuel Injectors is cut off during deceleration with the throttle valve closed, at speeds over 914 rpm, in no-load conditions in which the headlights, blower fan, rear defogger, radiator fan and air conditioner are not operating.
^ Fuel cut-off action also takes place when a maximum engine speed of 6,650 rpm is exceeded, regardless of the position of the throttle valve, to protect the engine from over-revving.
A/C Compressor Clutch Relay
When the ECM receives a demand for cooling from the air conditioning system, it delays the compressor from being energized, and enriches the mixture to assure smooth transition to the A/C mode.
Evaporative Emission (EVAP) Purge Control Solenoid Valve
When the engine coolant temperature is below 75°C (167°F), the ECM supplies a ground to the EVAP Purge Control Solenoid Valve which cuts vacuum to the EVAP Purge Control Diaphragm valve.
Alternator Control
The system controls the voltage generated at the alternator in accordance with the electrical load and drive mode, which reduces the engine load to improve the fuel economy.
Lock-up Control Solenoid Valve (A/T)
The vehicle speed and throttle position sensor inputs to the ECM are used to send an on/off voltage signal to the Lock-up Control Solenoid Valve for precise timing of the Torque Converter Lock-up System.
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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.