DIAGNOSIS FUNCTION


FCM-LS INDICATOR LAMP AND FCM-LS OFF INDICATOR LAMP <VEHICLES WITH FCM-LS>

When an error occurs on the following items related to the Radar sensing misacceleration Mitigation System (RMS) (Forward) {hereinafter referred to as RMS (Forward)}, the engine-ECU turns on the FCM-LS indicator lamp and FCM-LS OFF indicator lamp and performs the fail-safe control. When the indicator lamps turn on, the set diagnosis code is checked.
In addition, the engine-ECU flashes the FCM-LS indicator lamp and sounds the buzzer while the RMS (Forward) is operating.
The FCM-LS indicator lamp and FCM-LS OFF indicator lamp turn on before the engine is started. However, this phenomenon is for checking the lamps, not a lamp failure.
note When the FCM-ECU has detected a failure of the FCM-LS, the set FCM-LS diagnosis code is checked to turn on the FCM-LS indicator lamp and FCM-LS OFF indicator lamp. (Refer to GROUP 54A - Forward Collision Mitigation System (Low speed range) (FCM-LS), Troubleshooting, Diagnosis function ).

FCM-LS INDICATOR LAMP AND FCM-LS OFF INDICATOR LAMP INSPECTION ITEMS


Code No.
 Diagnosis item
P0122*
 Throttle position sensor (main) circuit low input
P0123*
 Throttle position sensor (main) circuit high input
P0222*
 Throttle position sensor (sub) circuit low input
P0223*
 Throttle position sensor (sub) circuit high input
P0606*
 Engine-ECU main processor malfunction
P0638*
 Throttle valve control servo circuit range/performance problem
P0642*
 Throttle position sensor power supply
P0657*
 Throttle valve control servo relay circuit malfunction
P1570
 Received failure signal from FCM-ECU <vehicles with FCM-LS>
P170E
 ABS/ACS error information <vehicles with FCM-LS>
P2100*
 Throttle valve control servo circuit (open)
P2101*
 Throttle valve control servo magneto malfunction
P2122*
 Accelerator pedal position sensor (main) circuit low input
P2123*
 Accelerator pedal position sensor (main) circuit high input
P2127*
 Accelerator pedal position sensor (sub) circuit low input
P2128*
 Accelerator pedal position sensor (sub) circuit high input
P2135*
 Throttle position sensor (main and sub) range/performance problem
P2138*
 Accelerator pedal position sensor (main and sub) range/performance problem
U0101*
 CVT-ECU time-out <CVT>
U0121
 ABS-ECU or ASC-ECU time-out
U0126
 Steering wheel sensor time-out <vehicles with FCM-LS>
U0155
 Combination meter time-out
U1011
 Parity or toggle bit error of FCM-LS <vehicles with FCM-LS>
U1073
 Bus-off <vehicles with FCM-LS>
U1220
 Parity or toggle bit error of ASC <vehicles with FCM-LS>
U15A0
 FCM-ECU time-out <vehicles with FCM-LS>
note For the codes that have * in the code No. field, the engine warning lamp (check engine lamp) will also turn on simultaneously.

FAIL-SAFE AND BACKUP FUNCTION


The control is carried out, which keeps the safety driving by the preset control logic when the diagnosis code is set. The diagnosis code having the fail-safe function is as follows.

List of fail-safe and backup function items
Code No.
 Diagnosis item
 Control content during malfunction
P0122
 Throttle position sensor (main) circuit low input
  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (sub) fails.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
P0123
 Throttle position sensor (main) circuit high input
P0222
 Throttle position sensor (sub) circuit low input
  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if throttle position sensor (main) fails.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
P0223
 Throttle position sensor (sub) circuit high input
P0515
 Battery temperature sensor system
 Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P0606
 Engine-ECU main processor malfunction
  • Throttle opening degree position is in default position.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
P0620
 Alternator control circuit
 Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P0638
 Throttle valve control servo circuit range/performance problem
  • Throttle opening degree position is in default position.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
P0642
 Throttle position sensor power supply
P0657
 Throttle valve control servo relay circuit malfunction
P1231
 Trustful check active stability control (ASC)
 The torque request from the ASC is ignored.
P1570
 Received failure signal from FCM-ECU <vehicles with FCM-LS>
 The RMS (Forward) and FCM-LS are prohibited.
P1608
 Battery current sensor system
 Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
P170E
 ABS/ASC error Information <vehicles with FCM-LS>
 The RMS (Forward) and FCM-LS are prohibited.
P2100
 Throttle valve control servo circuit (open)
  • Throttle opening degree position is in default position.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
P2101
 Throttle valve control servo magneto malfunction
P2122
 Accelerator pedal position sensor (main) circuit low input
  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (sub) fails.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
P2123
 Accelerator pedal position sensor (main) circuit high input
P2127
 Accelerator pedal position sensor (sub) circuit low input
  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (main) fails.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
P2128
 Accelerator pedal position sensor (sub) circuit high input
P2135
 Throttle position sensor (main and sub) circuit range/performance problem
  • Throttle opening degree position is in default position.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
P2138
 Accelerator pedal position sensor (main and sub) circuit range/performance
  • Throttle opening degree is restricted.
  • Throttle opening degree position is in default position if accelerator pedal position sensor (sub) fails.
  • The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
U0101
 CVT-ECU time out
 The RMS (Forward) and FCM-LS are prohibited. <vehicles with FCM-LS>
U0121
 ABS-ECU or ASC-ECU time-out
U0126
 Steering wheel sensor time-out <vehicles with FCM-LS>
U0155
 Combination meter time-out
U1011
 Parity or Toggle bit Error of FCM-LS <vehicles with FCM-LS>
U1073
 Bus-Off <vehicles with FCM-LS>
U1220
 Parity or Toggle bit Error of ASC <vehicles with FCM-LS>
U15A0
 FCM-ECU time-out <vehicles with FCM-LS>