DIAGNOSIS FUNCTION


WARNING INDICATOR

If a malfunction relating to the A/T system occurs, the symbol (A) will be displayed on the information screen in the multi-information display.
Check if the diagnosis code is set when the symbol (A) continues being displayed in the information screen in the multi information display.
note Only when the inhibitor switch is defective, symbol "A" will flash in the selector lever position indicator.
Symbol (B) (on the multi-information display) depends on the AT fluid temperature, which A/T fluid temperature sensor informs of. When the symbol (B) is displayed in the information screen in the multi information display, the A/T fluid temperature is high. (When the A/T fluid temperature sensor 1 detects the fluid temperature of approx. 136°C or higher, symbol (B) is turned on. When it drops below approximately 131°C, symbol (B) is turned off automatically. Meanwhile, when the A/T fluid temperature sensor 2 detects the fluid temperature of approx. 138°C or higher, symbol (B) is turned on. When it drops below approximately 128°C, symbol (B) is turned off automatically.)
note When A/T fluid reaches a high temperature, the shift program for the D range will be modified to lower the fluid temperature. It is control to lower temperature of A/T fluid, and this phenomenon is not trouble. If temperature of A/T fluid falls, A/T returns to normal movement.

METHOD OF READING THE DIAGNOSIS CODE
Use the M.U.T.-III to read the diagnosis code. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points .)

METHOD OF ERASING THE DIAGNOSIS CODE
Use the M.U.T.-III to erase the diagnosis code. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points .)

FREEZE FRAME DATA CHECK


Various data of when the diagnosis code is determined is obtained, and the status of that time is stored. By analysing each data using the M.U.T.-III, troubleshooting can be performed efficiently.
Display items of the freeze frame data are as follows.

FREEZE FRAME DATA REFERENCE TABLE
Item No.
 Check Item
 Unit/Display
1
 Odometer
 km
2
 Ignition cycle (Warm up cycle)
 -
4
 Accumulated minute
 min
5
 Accelerator pedal position sensor (APS)
 %
6
 Input shaft speed sensor
 r/min
7
 Output shaft speed sensor
 r/min
8
 Engine coolant temperature sensor
 °C
9
 A/t fluid temperature sensor (Oil pan)
 °C
10
 Inhibitor switch
 P
R
N
D
11
 Shift position
 1st
2nd
3rd
4th
5th
6th
7th
8th
12
 Lock-up condition
 L-up OFF
L-up ON

FAIL-SAFE FUNCTION


If an abnormality occurs to the signal of sensors, switches, solenoids, or others, A/T-ECU performs a control for the driver safety and system protection. The control contents are as follows.

FAIL-SAFE REFERENCE TABLE
Diagnosis code No.
 Control content
P0603
  • Control according to default value
P0604
  • Emergency mode 3
P0605
  • Emergency mode 3
P0613
  • A/T-ECU reset (solenoid cut-off)
P0707
P0708
  • The system assumes the D range as a fixed value even if any other range is selected.
  • The system assumes the R range as a fixed value when the reverse switch is turned on.
  • Emergency mode 4
P0711
P0712
P0713
  • Learning control prohibition
  • Slip control prohibition
  • Judges the fluid temperature from oil temperature sensor 1 as 80°C.
P0717
P07BF
P07C0
  • Backup data switched
  • Learning control prohibition
  • Slip control prohibition
  • Neutral control prohibition
  • Multiple shifting disabled
  • Lock-up control prohibition
P0722
P077C
P077D
  • Backup data switched
  • Learning control prohibition
P0729
P0732
P0733
 P0734
P0735
 P076F
P07D9
  • Emergency mode 2

P0731
 <Fault at 1st gear>

  • Emergency mode 2
<Fault when 1st-gear engine braking acts, or 2nd, 3rd and 4th gear is selected>

  • Multiple shifting disabled
  • The system selects a safe gear.
  • Then, emergency mode 2
P073E
  • Learning control prohibition
P0741
  • Lock-up control prohibition
  • Slip control prohibition
P0742
  • Learning control prohibition
  • Lock-up control prohibition
  • Slip control prohibition
  • Neutral control prohibition
  • Engine stall prevention*
P0780
  • Multiple shifting disabled
  • Emergency mode 2

P07E5
  • None
P0812
  • Keep the reverse switch off.
P0815
P0816
  • Paddle shift control prohibition
P0828
P0958
  • Sport mode OFF judgement
  • Paddle shift control prohibition
P0882
  • Reverse control prohibition
  • Shifting prohibited (For 1st, 2nd, 3rd or 4th gear, the 3rd gear will be selected as fixed value)
  • Shifting prohibited (For 5th, 6th, 7th or 8th gear, the 7th gear will be selected as fixed value)
  • Multiple shifting disabled
  • Emergency mode 5

P0883
  • None
P0961
P0965
P0966
P0967
P0969
P0970
 P0971
P2719
P2720
P2721
P2728
P2729
 P2730
P2737
P2738
P2739
P2762
  • Emergency mode 1

P0962
P0963
 P0973
 P0974
  • Emergency mode 3

P0976
P0977
  • Learning control prohibition
  • The system assumes 2nd gear when 1st-gear engine braking is requested at 10 km/h or more.
  • The system assumes 1st gear when 1st-gear engine braking is requested at 5km/h or less.
P1711
  • Solenoid cut-off (Holds in 3rd gear while 1st to 4th gear is selected, holds in 7th gear while 5th to 8th gear is selected)
P1712
  • Solenoid cut-off (Holds in 3rd gear while 1st to 4th gear is selected, holds in 7th gear while 5th to 8th gear is selected)
P1713
  • Shift indicator "A" flashes
P1752
  • The system prohibits the C3 clutch and B1 brake engagement when the transfer is changed over.
P1779
 <No braking effect although 1st-gear engine braking is requested>

  • Learning control prohibition
<Running at 5th gear although 1st-gear engine braking is requested>

  • The system assumes 2nd gear when 1st-gear engine braking is requested at 10 km/h or more.
  • The system assumes 1st gear when 1st-gear engine braking is requested at 5km/h or less.
P1799
  • Learning control prohibition
  • The system assumes the brake fluid pressure as 0 kPa.
P2711
  • Shifting prohibition
  • Emergency mode 2

P2742
P2743
  • Judges the fluid temperature from oil temperature sensor 2 as 80°C.
P2763
  • Learning control prohibition
  • Lock-up control prohibition
  • Slip control prohibition
  • Neutral control prohibition
P2764
  • Lock-up control prohibition
  • Slip control prohibition
P2771
  • Learning control prohibition
  • Slip control prohibition
  • Lock-up control prohibition
  • Uphill and downhill drive control prohibition
  • 7th and 8th gears disabled
U0001
U0100
  • Emergency mode 3
U0114 <4WD>
  • AWC-coordinated control prohibition
  • Learning control prohibition
  • Slip control prohibition
  • Lock-up control prohibition
  • Uphill and downhill drive control prohibition
  • 7th and 8th gears disabled
U0121
  • ASTC joint control prohibition
U0141
  • The system assumes that the brake switch is ON.
U0155
  • The system assumes that the ambient temperature is -40°C.
U0164
  • A/C-interlinked control disabled
U1195
U1197
  • Coding value is used as a default value.
U1EE0
U1EE1
  • Solenoid cut-off (Holds in 3rd gear while 1st to 4th gear is selected, holds in 7th gear while 5th to 8th gear is selected)
note *: When the system determines that the lock-up clutch stuck on, it puts the transmission in neutral by disengaging internal clutches at low speed in the D or R range to prevent the engine from stalling. Therefore, creeping does not occur. When you depress the accelerator pedal, the internal clutches will be engaged and then the vehicle will start.

Emergency Mode


In the emergency mode, the following controls will be disabled.

(a) Emergency mode 1




Emergency mode 1
 Step 1
 Step 2a
 Step 2b
 Step 3
 Step 4
 Step 5
 Step 6
Gear condition at failure decision
 Reverse
 Solenoid cut
 Keep condition
 Keep condition
 Keep condition
 Keep condition
 Keep condition
 Keep condition
1st gear
 Solenoid cut (Shift to 3rd)



(*1)



(*2)



(*2)



(*2)



(*2)
2nd gear
3rd gear
4th gear
 Solenoid cut (Shift to 7th)
5th gear
6th gear
7th gear
8th gear
Reverse control
 Impossible
 Impossible
 Possible
 Possible
 Possible
 Possible
 Possible
Main solenoid switch
 OFF
 OFF
 ON
 ON
 ON
 ON
 ON
note
  • Main solenoid switch "ON": A/T-ECU can control the gear
  • Main solenoid switch "OFF": A/T-ECU can not control the gear
  • *1: Appropriate gear is decided to consider failed solenoid, vehicle speed and gear before emergency mode start.
  • *2: Appropriate gear is decided to consider failed solenoid, MAX/MIN judgement and gear before emergency mode start.
  • *3: (1) or (2) or (3) are fulfilled.

      • (1) All of the following conditions are fulfilled;

      1. Selector lever position: R range
      2. Vehicle speed: 0 km/h

      (2) All of the following conditions are fulfilled;

      1. Selector lever position: P, N, D range (include sport mode)
      2. Vehicle speed: 20 km/h or less

      (3) All of the following conditions are fulfilled;

      1. Selector lever position: P, N, D range (include sport mode)
      2. Vehicle speed: 30 km/h or less
      3. Engine torque: 50 N·m or less

  • *4: In case that it is impossible to keep the gear due to failure, near gear is selected according to failed component.

(b) Emergency mode 2




Emergency mode 2
 Step 1
 Step 2
 Step 3
 Step 4a
 Step 4b
 Step 5
Gear condition at failure decision
 Reverse
 Keep gear
 Keep gear
 Keep gear
 Keep gear
 Keep gear
 Keep gear
1st gear
 Keep gear.
No lock-up control.
 SL1 and SL2 solenoid output ON.
Other solenoid output OFF.
Keep gear.
 Keep gear.
Neutral detection (*3).
 Shift to 6th
 Shift to 4th
 Enable shift gear (*4).
Keep gear.
No lock-up control.
2nd gear
3rd gear
4th gear
5th gear
6th gear
7th gear
8th gear
Reverse control
 Possible
 Possible
 Possible
 Possible
 Possible
 Possible
Main solenoid switch
 ON
 ON
 ON
 ON
 ON
 ON
note
  • Main solenoid switch "ON": A/T-ECU can control the gear
  • Main solenoid switch "OFF": A/T-ECU can not control the gear
  • *1: After shifting D → N → D, come back to the gear before D → N.
  • *2: In case of following condition, C1 clutch is judged release condition.

    1. Neutral judgement is decided (same as neutral condition in D range).
    2. SP/C1 calculation is backup signal or engine revolution speed failure detection or CAN failure decision.
  • *3: (1) or (2) or (3) are fulfilled.

      • (1) All of the following conditions are fulfilled;

      1. Selector lever position: R range
      2. Vehicle speed: 0 km/h

      (2) All of the following conditions are fulfilled;

      1. Selector lever position: P, N, D range (include sport mode)
      2. Vehicle speed: 20 km/h or less

      (3) All of the following conditions are fulfilled;

      1. Selector lever position: P, N, D range (include sport mode)
      2. Vehicle speed: 30 km/h or less
      3. Engine torque: 50 N·m or less
Max value of torque converter torque ratio is used for calculating input torque limitation because this ratio cannot be calculated in case of following.
"Engine revolution speed failure" or "input revolution sensor failure".

  • *4:

      • (1) In case of slipping after gear step fixation is cancelled. Then shifting gear is permitted.
      (2) In case of "SL1 OFF failure", "possibility to shift 3rd" is judged before fixing 6th.
      Possible: shift 3rd, impossible: fix 6th

(c) Emergency mode 3




Emergency mode 3
 Step 1
 Step 2
 Step 3
 Step 4
Gear condition at failure decision
 Reverse
 Keep condition
 Keep condition
 Keep condition
 Keep condition
1st gear
 Keep gear
 Keep gear
 Shift to 3rd
 Keep gear
2nd gear
3rd gear
 Keep gear
4th gear
 Shift to 3rd
5th gear
6th gear
7th gear
8th gear
Reverse control
 Possible
 Possible
 Possible
 Possible
Main solenoid switch
 ON
 ON
 ON
 ON
note
  • Main solenoid switch "ON": A/T-ECU can control the gear
  • Main solenoid switch "OFF": A/T-ECU can not control the gear
  • *1: After shifting D → N → D, come back to the gear before D → N.
  • *2: (1) or (2) or (3) are fulfilled.

      • (1) All of the following conditions are fulfilled;

      1. Selector lever position: R range
      2. Vehicle speed: 0 km/h

      (2) All of the following conditions are fulfilled;

      1. Selector lever position: P, N, D range (include sport mode)
      2. Vehicle speed: 20 km/h or less

      (3) All of the following conditions are fulfilled;

      1. Selector lever position: P, N, D range (include sport mode)
      2. Vehicle speed: 30 km/h or less
      3. Engine torque: 50 N·m or less

(d) Emergency mode 4




Emergency mode 4
 Step 1
 Step 2
 Step 3
 Step 4
Gear condition at failure decision
 Reverse
 Keep condition
 Keep condition
 Keep condition
 Keep gear
1st gear
 Keep gear
 Keep gear
 Shift to 3rd
2nd gear
 Shift to 4th
3rd gear
4th gear
 Keep gear
5th gear
6th gear
7th gear
 Shift to 6th
8th gear
Reverse control
 Possible
 Possible
 Possible
 Possible
Main solenoid switch
 ON
 ON
 ON
 ON
note
  • Main solenoid switch "ON": A/T-ECU can control the gear
  • Main solenoid switch "OFF": A/T-ECU can not control the gear
  • *1: After shifting D → N → D, come back to the gear before D → N.
  • *2: (1) or (2) or (3) are fulfilled.

      • (1) All of the following conditions are fulfilled;

      1. Selector lever position: R range
      2. Vehicle speed: 0 km/h

      (2) All of the following conditions are fulfilled;

      1. Selector lever position: P, N, D range (include sport mode)
      2. Vehicle speed: 30 km/h or less

      (3) All of the following conditions are fulfilled;

      1. Selector lever position: P, N, D range (include sport mode)
      2. Vehicle speed: 30 km/h or less
      3. Engine torque: 50 N·m or less

  • *3: In case of shifting to 6th and following condition is satisfied, A/T-ECU shift to neutral and command torque limitation 50 N·m.

      • Output shaft speed at 6th gear: 6,500 r/min <6B3>, 4,500 r/min <4N1> or less

(e) Emergency mode 5




Emergency mode 5
 Step 1
Gear condition at failure decision
 Reverse
 All solenoid output OFF.
1st gear
 All solenoid output OFF (shift to 3rd).
2nd gear
3rd gear
4th gear
5th gear
 All solenoid output OFF (shift to 7th).
6th gear
7th gear
8th gear
Reverse control
 Impossible
Main solenoid switch
 ON
note
  • Main solenoid switch "ON": A/T-ECU can control the gear
  • Main solenoid switch "OFF": A/T-ECU can not control the gear