The Stop lamp switch is used to judge whether the acceleration system is abnormal or not. The stop lamp switch has a duplex system(signals brake test or brake light) to memorize the abnormality when the signals of depressing and releasing the brake pedal are detected simultaneously.
Checking output signals from both Stop lamp switch when all of them are On or OFF simultaneously, if abnormal signal is detected for more than 60 sec., an error is recognized. And if this condition lasts for certain period, ECM sets P0504.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Plausibility check | 1. Poor connection 2. Open or short in Stop lamp switch 3. Faulty Stop lamp switch |
Enable Conditions |
•
IG On | |
Threshold Value |
•
Time brake light switch/brake test switch do not correlate longer than > 1 sec | |
Diagnostic Time |
•
60 sec | |
MIL ON Condition |
•
NO MIL |
Item | During taking off the brake | During stepping on the brake |
Stop Lamp | 0V | Battery voltage |
Stop Lamp Switch | Battery voltage | 0V |
