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.
Scan Tool Output Controls
2001 Chevrolet Cavalier LS, 2.4 TSECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Powertrain Control Module Scan Tool Output Control
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Crankshaft Position Variation Learn | Psgr. Cars | Enables the powertrain control module (PCM) to learn the variations in the crankshaft position (CKP) system. The PCM will learn the variations once the following conditions are met:
The PCM learns the variation values on the deceleration from fuel cut-off. |
| Cylinder Power Balance | Fuel System | Enables/Disables a cylinder by turning OFF the fuel injector to the cylinder. The fuel injector is normally enabled. The PCM disables the fuel injector when the following conditions are met:
When the DISABLE is selected, the PCM turns the injector OFF for 15 seconds. During this period, the engine operates with a misfire. |
| EVAP Purge/Seal | Engine Output Controls/EVAP System | Activates both the purge solenoid and the vent solenoid to seal the system. The normal commanded state of both valves is NONE. Device control will be aborted and inhibited if FTP sensor exceeds 38 mm Hg (20 in H2O). |
| EVAP Purge Solenoid (PWM) | Engine Output Controls/EVAP System | Activates the purge solenoid in 10 percent increments from 0-100 percent. The normal commanded state is NONE. Device control will be aborted and inhibited if FTP sensor exceeds 38 mm Hg (20 in H2O). |
| EVAP Vent Solenoid | Engine Output Controls/EVAP System | Activates the vent solenoid. The normal commanded state is NONE. Device control will be aborted and inhibited if FTP sensor exceeds 38 mm Hg (20 in H2O). |
| Front 02 Sensor Heater | Engine Output Controls | Activates the front 02 sensor heater ON or OFF. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. On a cold engine with the key ON, engine OFF, the HO2S signals will continue to drop below bias when commanded ON. The heater will remain ON until cancelled by the scan tool. |
| Fuel Injector Balance | Fuel System | Enables fuel injector in order to verify proper fuel injector flow. The PCM will pulse the selected injector when the following conditions are met:
The selected fuel injector can only be flowed/pulsed once per ignition cycle. |
| Fuel Pump | Engine Output Controls | Activates the fuel pump ON or OFF. The fuel pump will remain ON until cancelled by the scan tool and/or will be aborted and/or inhibited if vehicle speed is present. |
| Fuel Trim Reset | Fuel System | Activates the reset of fuel trim data in all fuel trim cells |
| Malfunction Indicator Lamp | Engine Output Controls | Activates the malfunction indicator lamp. The MIL will remain illuminated until cancelled by the scan tool. |
| RPM Control | IAC System | Activates the idle air control (IAC) valve to change engine RPM. The normal commanded state is NONE. To enable the RPM control, all instructions on the scan tool must be completed. The system will INCREASE or DECREASE the RPM within a range of 400-2,000 RPM. The SET STEP VALUE changes the RPM by increments of 25 RPM, 100 RPM and 500 RPM. The system remains in the commanded state until cancelled by the scan tool. |
| Rear 02 Sensor Heater | Engine Output Controls | Activates the rear 02 sensor heater ON or OFF. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. On a cold engine, with the key ON, engine OFF, the HO2S signals will continue to drop below bias when commanded ON. The heater will remain ON until cancelled by the scan tool. |
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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.