The PCM monitors signals from both Stop lamp switches. If both switches have High or Low voltage simultaneously, (more than 0.5 sec) the PCM sets a P0504 DTC.
Item | Detecting Condition | Possible cause | |
DTC Strategy | Case1 |
•
Comparing 2 brake signals during driving | 1. Poor connection 2. Open or short in Stop lamp switch 3. Faulty Stop lamp switch |
Case2 |
•
PCM detects stop lamp input signal when vehicle stops. | ||
Enable Conditions | Case1 |
•
Engine running
•
Vehicle Speed Sensor is abnormal.
•
Engine running
•
Vehicle Speed Sensor is normal and Vehicle Speed is over 20 kph (12.4 mph) during 1 sec or more. | |
Case2 |
•
Engine running
•
Vehicle Speed Sensor is normal and Vehicle Speed is over 20kph (12.4 mph) during 1 sec or more. | ||
Threshold value | Case1 |
•
The one brake signal's change duration when another signal has been changed longer than 0.5 sec. | |
Case2 |
•
Vehicle speed less than 3 kph (1.8 mph)
•
Vehicle acceleration slower than -6kph/s
•
Stop lamp "OFF" and no change of the stop lamp signal for more 3 | ||
Diagnosis Time |
•
Continuous | ||
MIL On Condition |
•
NO MIL ON(DTC only) | ||
