DIAGNOSTIC FUNCTION

FAIL-SAFE/FAIL-PROOF FUNCTION AND DIAGNOSIS

• In the event of a fault in the A/T-ECU or any of the sensors and actuators, or in the event of seriously erroneous operation on the part of the driver, a fail-safe/fail-proof function controls the A/T as appropriate to protect the passengers and vehicle from danger.
  
• The ECU constantly monitors inputs from sensors and outputs from actuators. In the event of an abnormality in these signals, it memorizes the symptoms and diagnoses the abnormality.
  

FAIL-SAFE/FAIL-PROOF FUNCTION

• In the event of a fault in the electronic control system, the vehicle can still be operated. In the D range, the vehicle can be driven in 3rd gear. In the 2 and L ranges, it can be driven in 2nd gear (except if the diagnosis code is P1773 [P0750], P1774 [P0755], P1775 [P0760], P1776 [P0765], P1778 [P0740], P1779, P1780, P1781, P1782, P1784, P1788 [P1751]).
  
• During forward motion at speeds of 7 km/h and above, the reverse gear cannot be engaged even if the selector lever is moved to the "R" position.
  

DIAGNOSIS FUNCTION

i) Diagnosis Items and Fail-Safe Items Among the diagnosis codes, higher values represent fail-safe items.


• Diagnosis Items: Code Nos.P1763 [P0710], P1764 [P0710], P1786, P1787
  
• Fail-safe items: Code Nos.P1766 [P0715], P1767 [P0720], P1773 [P0750], P1774 [P0755], P1775 [P0760], P1776 [P0765], P1778 [P0740], P1779, P1780, P1781, P1782, P1784, P1788 [P1751]
  
ii) Indication Method and Sequence


a) During Normal Vehicle Operation
If the fail-safe function operates during normal vehicle operation, the N range lamp flashes at a frequency of 1 Hz to inform the driver (This occurs only in the D range).
b) Display Sequence
Diagnosis codes are indicated in the order in which they were issued, with fail-safe items followed by diagnosis items. This sequence is then repeated.

iii) Memorization


• Up to 10 diagnosis items can be memorized.
  
• If the memory capacity is exceeded, diagnosis and fail-safe items in the memory are overwritten, starting with the oldest.
  
• No code can be memorized more than once.
  
iv) Diagnosis Code Deletion


a) Automatic Deletion All diagnosis codes are deleted from memory the 200th time the A/T fluid temperature reaches 50°C after memorization of the most recent diagnosis code.
b) Forced Deletion Memorized diagnosis codes can be deleted using the M.U.T.-III provided the following conditions are satisfied:


• The ignition switch is ON;
  
• There is no detection pulse from the input shaft speed sensor;
  
• There is no detection pulse from the output shaft speed sensor;
  
• The inhibitor switch should be P position;
  
• The fail-safe function is not operational.
  

(2) DATA LIST

(3) ACTUATOR TEST