Fail-Safe Chart

A960E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: FAIL-SAFE CHART

1. FAIL-SAFE CHART

This function minimizes the loss of the ECT functions when any malfunction occurs in each sensor or solenoid.





*1: AI (Artificial Intelligence) -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. As a result, a comfortable ride has been realized.

(a) Fail-safe operation for electronically malfunctioning shift solenoid valve (S1, S2, S3, S4 and SR):

HINT
Fail-safe operation in the event of an electric system malfunction.

Fail safe function:

If either of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoid "ON" and "OFF" in order to shift into the gear positions shown in the table below.

In case of a short circuit, the ECM stops sending current to the short circuited solenoid.

Even if staring 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)
* ->: Condition in the electrical malfunction is shown on the left of "->".
* Condition in the fail-safe mode is shown on the right of "->".
* (E/B): Engine brake






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






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






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






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