How to switch off check engine light - Astra Holden Cars & Trucks

Initially a code read should provide an answer of some sort and is the first step to a diagnosis.

In most cases when the engine management detects a fault it will record it, switch on the light and then switch to a get-you-home programme when often the driver will find little or no difference in driveability.
The main exceptions are a faulty cam or crank sensor which will stop or almost stop the engine and this might be your problem.

It is wise to check the exact function of the light with the vehicle handbook. Sometimes there is more than one light to indicate a fault and apart from the check engine light there could be an emissions light or an overboost light for turbo models.

The low oil pressure warning lamp will illuminate anytime the ignition switch is turned to the ON position without the engine running. When the engine is running, the light also illuminates if the engine oil pressure drops below a safe oil pressure level. To test the system, perform the following:
If the oil pressure light does not work, perform the following:

1. Turn the ignition switch to the ON position.
2. If the lamp does not light, check for a broken or disconnected wire around the engine and oil pressure sending unit switch.
3. If the wire at the connector checks out OK, pull the connector loose from the switch and, with a jumper wire, ground the connector to the engine.
4. With the ignition switch turned to the ON position, check the warning lamp. If the lamp lights, make sure the oil pressure switch is properly grounded in the cylinder block, and if so replace the oil pressure switch. If the lamp still fails to light, check for a burned out lamp or disconnected socket in the instrument cluster.

To diagnose an oil pressure light that stays on, perform the following:

1. Check the engine oil level and top off as necessary. If the engine was 2 or more quarts low on oil, test start the engine after topping off the oil level and recheck the oil pressure light operation. If the light stays on, stop the engine immediately and go to the next step.
2. Disconnect the wire at the sending unit, then turn the ignition switch to theON position. If the light remains on, check the wire from the sending unit to the gauge for being shorted to ground and repair as necessary. If the light goes out, turn the ignition switch OFF and go to the next step.
3. Replace the oil pressure sending switch with a known good switch.
4. Start the engine and check the oil pressure light operation. If the light stays on with the engine running, stop the engine immediately to avoid severe engine damage until the cause of the problem can be determined.

WARNING
If the oil pressure light remains on while the engine is started, stop the engine immediately. Do not operate the engine until the cause of the problem can be determined. Operating an engine with low oil pressure will cause severe internal damage.

Possible causes for an oil pressure light to stay on are:


Pinched or grounded sensor wireDefective oil pressure sending unitRestricted or severely leaking oil filterExcessive internal engine bearing clearance.Insufficient or severely contaminated engine oilBlocked oil pump pickup screen or severely worn oil pump

Check ignition switch wiring and for internal problems.

P0703 Suzuki - Brake Switch Circuit Malfunction
Possible causes
- Faulty Brake Switch
- Misadjusted Brake Switch
- Brake Switch harness is open or shorted
- Brake Switch circuit poor electrical connection
Check if the stop light works with the brake pedal, if the brake lights are inoperative, replaced or adjust the brake switch.
Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Brake lights inoperative

Need more information. Does the car start normally with a key? Is there a switch for a mechanic to disable the remote start while working on it (some units have a toggle switch)

ignition is shorting with the light stalk check wireing

Check the engine control unit itself and the ignition module.

You can disconnect your battery for 15 minutes or pull the fuse for an ECM or PCM fuse, but the best way is to visit any local repair shop. Most shops will have a universal Check Engine Light Code Reader that can quickly and safely reset check engine light trouble codes. It should take about 30 seconds.

Ask your local service center if they could reset the check engine light with a Check Engine Light Code Reader.

Check your backup light circuit at the trans.If this is a manual trans it will be a seperate switch if automatic it should be in with the neutral saftey switch.Sometimes on a automatic the switch is adjustable and may just out of adjustment.Check engine light have it scanned and turn off light by clearing code at your local Autozone or pepboys

wires are pinched and shorting together near the left (drivers side) trunk hinge. brake light power is feeding back through the reverse light wiring. this will also turn on the check engine light with a neutral safety switch malfunction code as the computer also sees this voltage in the reverse light circuit. Find and repair the wiring, pull the EFI fuse in the panel under the hood to clear the code. Hope this helps