Fail-Safe Chart

A761E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: FAIL-SAFE CHART

FAIL-SAFE CHART

1. FAIL-SAFE CHART
This function minimizes the loss of the ECT functions when a malfunction occurs in a sensor or solenoid.





HINT: *1: Artificial Intelligence Shift (AI-SHIFT) control
In addition to the switching of the shift pattern through the pattern select switch, the AI-SHIFT control enables the ECM to estimate the road conditions and the driver's intention in order to automatically select the optimal shift pattern.

(a) Fail-safe operation for electronically malfunctioning shift solenoid valves (S1, S2, S3, S4 and SR).
HINT: Fail-safe operation in the event of an electric system malfunction.
Fail-safe function:
If any of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoids "ON" and "OFF" in order to shift into the gear positions shown in the table below. Also, the ECM stops sending the current to the open or short circuited solenoid.
Even if starting the engine again in the fail-safe mode, the gear position remains in the same position.

Fail-safe chart for electrical malfunction:

























HINT:
- *2: Actual gear shift (gear position) under fail-safe operation.
- X: OFF (the ECM stops sending current to a malfunctioning solenoid valve)
- Electrical malfunction: Condition is shown to the left of the "->".
- Fail-safe mode: Condition is shown to the right of the "->".
- E/B: Engine brake.

(b) Fail-safe operation for mechanical malfunction.
HINT: Fail-safe operation in the event of a mechanical system malfunction.
Fail-safe function:
The ECM controls the gear position as shown in the table below when malfunctions occur.

Fail-safe chart for mechanical malfunction:





HINT:
- *2: Actual gear shift (gear position) under fail-safe operation.
- *3: Under engine braking, downshifting to 1st or 2nd gear is prohibited.