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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control System (VDC/TCS/Abs) (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> C1198 Vacuum Sensor >> DTC Description

DTC Description

DTC DETECTION LOGIC 

DTC CONSULT screen terms(Trouble diagnosis content) DTC detection condition
C1198-01 VACUUM SEN CIR(Vacuum sensor circuit) 1 Diagnosis condition When ignition switch is ON.
Signal (terminal) Vacuum sensor malfunction signal
Threshold When an open circuit is detected in vacuum sensor circuit.
Diagnosis delay time 1 second or less
2 Diagnosis condition When ignition switch is ON.
Signal (terminal) Vacuum sensor malfunction signal
Threshold When a short circuit is detected in vacuum sensor circuit.
Diagnosis delay time 1 second or less
3 Diagnosis condition When ignition switch is ON.
Signal (terminal) Vacuum sensor malfunction signal
Threshold When a malfunction is detected in vacuum sensor noise.
Diagnosis delay time 1 second or less

POSSIBLE CAUSE 

NOTE: SYMBOL Confirm if DTC is PAST or CRNT. If DTC is CRNT, proceed with Diagnosis Procedure. If DTC is PAST, clear the DTC. Do not replace the ABS actuator and electric unit (control unit) for a PAST DTC.
PAST DTC CRNT DTC
  • Harness or connector
  • ABS actuator and electric unit (control unit) power supply system
  • Fuse
  • Fusible link
  • Battery
  • Harness or connector
  • Vacuum sensor (brake booster)
  • ABS actuator and electric unit (control unit)

FAIL-SAFE 

Electrical vacuum assistance of brake booster is suspended