ON-BOARD DIAGNOSTIC SYSTEM FAIL-SAFE FUNCTION [AY6A-EL, AY6AX-EL]

id0502k1280200

Special Features

• If a transaxle malfunction is detected by the malfunction detection function, the fail-safe function assures vehicle driveability by limiting the transaxle control and switching the control value to a preset value.

DTC-Separate Fail-Safe

DTC No. | Definition | Fail-safe
--- | --- | ---
P0220:00 | Accelerator pedal position circuit | • Inhibits learning control • Inhibits TCC control • Inhibits slip control • Inhibits adaptive shift control • Fixes the accelerator pedal position open signal at 18.8%
P0601:00 | Flash ROM error | • Emergency mode 3
P0603:00 | EEPROM error | • TCM uses the default value as the initial value for EEPROM
P0604:00 | RAM error | • Emergency mode 3
P0702:00 | Linear solenoid driver electrical | • Emergency mode 1
P0706:00 | TR switch circuit range/performance | • Emergency mode 4 • Locks in D position, if the counter drive gear (output) speed signal (VSS) is 0 rpm
P0707:00 | TR switch circuit low | • Emergency mode 4 • Locks in D position, if the counter drive gear (output) speed signal (VSS) is 0 rpm
P0708:00 | TR switch circuit high | • Emergency mode 4 • Locks in D position, if the counter drive gear (output) speed signal (VSS) is 0 rpm
P0711:00 | TFT sensor circuit range/performance | • Inhibits learning control • Inhibits slip control • Fixes ATF temperature value at 80 °C {176 °F}
P0712:00 | TFT sensor circuit low | • Inhibits learning control • Inhibits slip control • Fixes ATF temperature value at 80 °C {176 °F}
P0713:00 | TFT sensor circuit high | • Inhibits learning control • Inhibits slip control • Fixes ATF temperature value at 80 °C {176 °F}
P0715:00 | Input/turbine speed sensor circuit | • Emergency mode 3
P0717:00 | Input/turbine speed sensor circuit no signal | • Emergency mode 3
P0720:00 | VSS circuit | • Inhibits learning control • Inhibits adaptive shift control • Back up from another device (DSC/RSC HU/CM, input/turbine speed sensor)
P0722:00 | VSS circuit no signal | • Inhibits learning control • Inhibits adaptive shift control • Back up from another device (DSC/RSC HU/CM, input/turbine speed sensor)
P0727:00 | Engine speed input circuit no signal | • Emergency mode 3
P0729:00 | Gear 6 incorrect ratio | • Emergency mode 2
P072D:00 | Incorrect gear ratio (1GR with engine brake stuck 2GR/3GR) | • Inhibits learning control • Inhibits adaptive shift control
P0730:00 | Incorrect gear ratio (1GR with engine brake stuck 4GR) | • Inhibits adaptive shift control
P0731:00 | Gear 1 incorrect ratio | • Emergency mode 2
P0732:00 | Gear 2 incorrect ratio | • Emergency mode 2
P0733:00 | Gear 3 incorrect ratio | • Emergency mode 2
P0734:00 | Gear 4 incorrect ratio | • Emergency mode 2
P0735:00 | Gear 5 incorrect ratio | • Emergency mode 2
P073F:00 | Incorrect Gear Ratio (1GR with engine brake) | • Inhibits learning control • Inhibits adaptive shift control
P074A:00 | Gear 2 stuck | • Shifting to safe gear
P074B:00 | Gear 3 stuck | • Shifting to safe gear
P074C:00 | Gear 4 stuck | • Shifting to safe gear
P074D:00 | Gear 5 stuck | • Shifting to safe gear
P074E:00 | Gear 6 stuck | • Shifting to safe gear
P0762:00 | Shift solenoid C stuck on | • Emergency mode 2
P0766:00 | Shift solenoid D performance or stuck off | • Emergency mode 2
P0771:00 | Shift solenoid E performance or stuck off | • Emergency mode 2
P0817:00 | Starter lock output signal circuit | -
P0819:00 | Up and down switch to transaxle range correlation | • Inhibits manual mode control
P0867:00 | ATF pressure | -
P0882:00 | TCM B+ low | • Emergency mode 5
P0883:00 | TCM B+ high | • Emergency mode 3
P0942:00 | Hydraulic pressure unit (at D position) | • Emergency mode 2
P0961:00 | Line pressure control solenoid circuit range/performance | • Emergency mode 1
P0962:00 | Line pressure control solenoid circuit low | • Emergency mode 3
P0963:00 | Line pressure control solenoid circuit high | • Emergency mode 3
P0973:00 | Shift solenoid A circuit low | • Emergency mode 3
P0974:00 | Shift solenoid A circuit high | • Emergency mode 3
P0976:00 | Shift solenoid B circuit low | • Inhibits learning control • Inhibits 1GR (M position)
P0977:00 | Shift solenoid B circuit high | • Inhibits learning control • Inhibits 1GR (M position)
P0978:00 | Shift solenoid C circuit range/performance | • Emergency mode 1
P0979:00 | Shift solenoid C circuit low | • Emergency mode 1
P0980:00 | Shift solenoid C circuit high | • Emergency mode 1
P0981:00 | Shift solenoid D circuit range/performance | • Emergency mode 1
P0982:00 | Shift solenoid D circuit low | • Emergency mode 1
P0983:00 | Shift solenoid D circuit high | • Emergency mode 1
P0984:00 | Shift solenoid E circuit range/performance | • Emergency mode 1
P0985:00 | Shift solenoid E circuit low | • Emergency mode 1
P0986:00 | Shift solenoid E circuit high | • Emergency mode 1
P0997:00 | Shift solenoid F circuit range/performance | • Emergency mode 1
P0998:00 | Shift solenoid F circuit low | • Emergency mode 1
P0999:00 | Shift solenoid F circuit high | • Emergency mode 1
P1700:00 | Hydraulic pressure unit (at R position) | • Inhibits learning control
P1719:00 | Engine torque signal error (inaccurate signal) | • Inhibits learning control • Inhibits adaptive shift control • Performs control with the engine torque value of 1.2
P1738:00 | Shift control solenoid component malfunction | • Inhibits adaptive shift control
P1783:00 | ATF high oil temperature malfunction | • Request torque limitation
P1919:00 | Engine coolant temperature signal error | • Inhibits slip control • Fixes the engine coolant temperature signal at 80 °C{176 °F}
P2544:00 | Engine torque signal error (invalid signal) | • Emergency mode 3
P2708:00 | Shift solenoid F stuck on | • Emergency mode 2
P2757:00 | TCC control solenoid circuit performance or stuck off | • Inhibits learning control • Inhibits TCC control • Inhibits slip control • Inhibits adaptive shift control
P2762:00 | TCC control solenoid range/performance | • Emergency mode 1
P2763:00 | TCC control solenoid circuit high | • Inhibits learning control • Inhibits TCC control • Inhibits slip control • Inhibits adaptive shift control
P2764:00 | TCC control solenoid circuit low | • Inhibits learning control • Inhibits TCC control • Inhibits slip control • Inhibits adaptive shift control
P2806:00 | Neutral position learning (Not performed yet) | • Locks start lock signal
U0073:00 | Control module communication bus off | • Emergency mode 3
U0100:00 | Lost communication with PCM | • Emergency mode 3
U0121:00 | Lost communication with DSC/RSC HU/CM | • Inhibits learning control
U0155:00 | Lost communication with instrument cluster | • Inhibits learning control
U0415:00 | Invalid data received from DSC/RSC HU/CM | • Inhibits learning control

Emergency Mode

Fail-safe

  • Inhibits learning control
  • Inhibits TCC control
  • Inhibits adaptive shift control
  • Inhibits adaptive shift control (Inhibit to start adaptive shift)
  • Inhibits reverse control

Emergency mode 1

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  • Failure decided by Linear solenoid B+ short or GND short/Open or Feedback or Driver malfunction.

Gear condition at failure detection | Gear | Step 1 | Step 2a | Step 2b | Step 3 | Step 4 | Step 5
R | Solenoid cut | Keep condition | Keep condition | Keep condition | Keep condition | Keep condition
1GR | Shifting to 3GR | *1 | Keep gear | Shifting to 3GR | Keep gear
2GR
3GR
4GR | Shifting to 5GR
5GR
6GR

*1 :Appropriate gear is decided to consider failed solenoid, vehicle speed and gear before emergency mode start.
*2 :1. or 2. or 3. are fulfilled

  1. All of the following conditions are fulfilled;
    ― Selector lever position: R
    ― Vehicle speed 0 km/h {0 mph} or less
  2. All of the following conditions are fulfilled;
    ― Selector lever position: P, N, D (include manual mode)
    ― Vehicle speed: 20 km/h {12 mph} or less
  3. All of the following conditions are fulfilled;
    ― Selector lever position: P, N, D (include manual mode)
    ― Vehicle speed: 30 km/h {18 mph} or less
    ― Engine torque: less than 50 N·m {5.0 kgf·m, 36 ft·lbf}

Emergency mode 2

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  • Failure decided by Gear ratio or Unusual shifting or Neutral condition or VSS no pulse.

Gear condition at failure detection | Gear | Step 1 | Step 2 | Step 3 | Step 4 | Step 5
R | Keep condition | Keep condition | Keep condition | Keep condition | Keep condition
1GR | • Keep gear • Inhibits TCC control | • Shift solenoid C and shift solenoid D solenoid output ON • Other solenoid output OFF • Keep gear | • Keep condition • Neutral detection | Shifting to 5GR | • Keep gear • Inhibits TCC control
2GR
3GR
4GR
5GR
6GR

*1 :1. or 2. or 3. are fulfilled

  1. All of the following conditions are fulfilled;
    ― Selector lever position: R
    ― Vehicle speed: 0 km/h {0 mph} or less
  2. All of the following conditions are fulfilled;
    ― Selector lever position: P, N, D (include manual mode)
    ― Vehicle speed: 20 km/h {12 mph} or less
  3. All of the following conditions are fulfilled;
    ― Selector lever position: P, N, D (include manual mode)
    ― Vehicle speed: 30 km/h {18 mph} or less
    ― Engine torque: less than 50 N·m {5.0 kgf·m, 36 ft·lbf}

Emergency mode 3

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  • Failure decided by Electrical failure except Linear solenoid B+ short or GND short/Open, Contact-less position switch or Battery voltage low supply voltage.

Gear condition at failure detection | Gear | Step 1 | Step 2 | Step 3 | Step 4
R | Keep condition | Keep condition | Keep condition | Keep condition
1GR | Keep gear | Keep gear | Shift to 3GR | Keep gear
2GR
3GR | Keep gear
4GR | Shift to 3GR
5GR
6GR

*1 :1. or 2. or 3. are fulfilled

  1. All of the following conditions are fulfilled;
    ― Selector lever position: R
    ― Vehicle speed: 0 km/h {0 mph} or less
  2. All of the following conditions are fulfilled;
    ― Selector lever position: P, N, D (include manual mode)
    ― Vehicle speed: 20 km/h {12 mph} or less
  3. All of the following conditions are fulfilled;
    ― Selector lever position: P, N, D (include manual mode)
    ― Vehicle speed: 30 km/h {18 mph} or less
    ― Engine torque: less than 50 N·m {5.0 kgf·m, 36 ft·lbf}

Emergency mode 4

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  • Failure decided by Contact-less position switch.

Gear condition at failure detection | Gear | Step 1 | Step 2 | Step 3 | Step 4
R | Keep condition | Keep condition | Keep condition | Keep condition
1GR | Keep gear | Keep gear | Shift to 3GR | Keep gear
2GR
3GR | Shift to 4GR
4GR | Keep gear
5GR | Shift to 6GR
6GR | Keep gear

*1 :Vehicle speed: 0 km/h {0 mph} or less

Emergency mode 5

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  • Failure decided by Battery voltage low supply voltage.

Gear condition at failure detection | Gear | Step 1
R | All solenoid output OFF
1GR | All solenoid output OFF (Shifting to 3GR)
2GR
3GR
4GR | All solenoid output OFF (Shifting to 5GR)
5GR
6GR