Possible causes
- Faulty Stop Light Switch
- Stop Light Switch harness is open or shorted
- Stop Light Switch circuit poor electrical connection
- Faulty Engine Control Module ( ECM)
When is the code detected?
Stop light switch does not turn off even once vehicle is driven(2 trip detection logic)
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1520 1997 Toyota Camry Description
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as the voltage supplied to the stop lights. The STP signal is used mainly to control the fuel cut–off engine speed (The fuel cut–off engine speed is reduced slightly when the vehicle is braking).
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