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General Information: DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item Detecting Condition Possible cause
DTC Strategy
  • Voltage monitoring
  • Open or short in power supply circuit ( IGN+)
Case1 Monitoring Period
  • Once during startup.
Enable Conditions
  • Watchdog and valve relay function is tested during startup. A failure is detected if the valve relay/Enable remains in off position when it is turned on and vice versa. Reason could be short to GND or UZ, interrupted lines or a defective output stage etc.
Case2 Monitoring Period
  • Continuous
Enable Conditions
  • A Fault is detected if valve relay voltage < 0.8 * battery voltage for a time 500ms.
Case3 Monitoring Period
  • Continuous
Enable Conditions
  • If valve relay malfunction and supply solenoid valve short to battery or supply solenoid valve and medium or high ohmic short of valve relay ( or a valve) to valve relay voltage, solenoid valve voltage or GND are detected.
Fail Safe
  • No valve actuation possible.
  • The ABS/EBD/ESC functions are inhibited.
  • The ABS/EBD/ESC warning lamps are activated.
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