AUTOMATIC TRANSMISSION SYSTEM FAIL-SAFE CHART
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FAIL-SAFE CHART
This function minimizes the loss of the ECT functions when any malfunction occurs in each sensor or solenoid.
Malfunction Part Function DTC P0717:
Transmission Revolution Sensor (NT)
During a transmission revolution sensor (NT) malfunction, shift control is effected through the transmission revolution sensor (SP2) signal.
During a transmission revolution sensor (NT) malfunction, up-shift to the 5th and 6th, AI-SHIFT*1 and flex lock-up clutch control are prohibited.
DTC P0722:
Transmission Revolution Sensor (SP2)
During a transmission revolution sensor (SP2) malfunction, shift control is effected through the transmission revolution sensor (NT) signal.
During a transmission revolution sensor (SP2) malfunction, up-shift to the 5th and 6th, AI-SHIFT*1 and flex lock-up clutch control are prohibited.
DTC P0712, P0713:
ATF Temperature Sensor
During an ATF temperature sensor malfunction, up-shift to the 5th and 6th and flex lock-up clutch control are prohibited. Shift Solenoid Valve S1, S2, S3, S4 and SR The current to the failed solenoid valve is cut off and control is effected by operating the other solenoid valves.
Shift control is effected depending on the failed solenoid as described in the table on the next page.
DTC P0748, P0778:
Shift Solenoid Valve SL1 and SL2
During a solenoid valve SL1 or SL2 malfunction, up-shift to the 5th and 6th and flex lock-up clutch control are prohibited. DTC P2757, P2759:
Shift Solenoid Valve SLU
During a solenoid valve SLU malfunction, the current to the solenoid valve is stopped. This stops lock-up control and flex lock-up control, fuel economy decreases. DTC P02714, P2716:
Shift Solenoid Valve SLT
During a solenoid valve SLT malfunction, the current to the solenoid valve is stopped. This stops line pressure optimal control, the shift shock increases. However, shifting is effected through normal clutch pressure control. *1: AI (Artificial Intelligence) -SHIFT control
In addition to the switching of the shift pattern through the combination 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.
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Fail-safe operation for electronically malfunctioning shift solenoid valve (S1, S2, S3, S4 and SR):
Tech Tips
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: Shift Lever Position Normal Gear Shift solenoid (ECM output) S1 S2 S3 S4 SR SL1 SL2 D 1st OFF ON ON OFF ON OFF ON 2nd ON ON ON OFF ON OFF ON 3rd ON OFF ON OFF ON OFF ON 4th ON OFF OFF OFF ON OFF ON 5th ON OFF OFF ON OFF ON OFF 6th ON ON OFF ON OFF ON OFF D5 1st OFF ON ON OFF ON OFF ON 2nd ON ON ON OFF ON OFF ON 3rd ON OFF ON OFF ON OFF ON 4th ON OFF OFF OFF ON OFF ON 5th ON OFF OFF ON OFF ON OFF D4 1st OFF ON ON OFF ON OFF ON 2nd ON ON ON OFF ON OFF ON 3rd ON OFF ON OFF ON OFF ON 4th ON OFF OFF OFF ON OFF ON D3 1st OFF ON ON OFF ON OFF ON 2nd ON ON ON OFF ON OFF ON 3rd (E/B) ON OFF ON OFF ON OFF OFF D2 1st OFF ON ON OFF ON OFF ON 2nd (E/B) ON ON ON ON ON OFF OFF D1 1st (E/B) OFF ON ON OFF ON OFF OFF Shift Lever Position Shift Solenoid Valve S1 Electrical Malfunction (P0973, P0974) Gear*2 Shift solenoid (ECM output) S1 S2 S3 S4 SR SL1 SL2 D 1st X ON ON OFF ON OFF ON 1st→4th X ON→OFF ON→OFF OFF ON OFF ON 3rd→4th X OFF ON→OFF OFF ON OFF ON 4th X OFF OFF OFF ON OFF ON 5th X OFF OFF ON OFF ON OFF N→5th X ON→OFF OFF ON OFF ON OFF D5 1st X ON ON OFF ON OFF ON 1st→4th X ON→OFF ON→OFF OFF ON OFF ON 3rd→4th X OFF ON→OFF OFF ON OFF ON 4th X OFF OFF OFF ON OFF ON 5th X OFF OFF ON OFF ON OFF D4 1st X ON ON OFF ON OFF ON 1st→4th X ON→OFF ON→OFF OFF ON OFF ON 3rd→4th X OFF ON→OFF OFF ON OFF ON 4th X OFF OFF OFF ON OFF ON D3 1st X ON ON OFF ON OFF ON 1st→4th X ON→OFF ON→OFF OFF ON OFF ON 3rd (E/B)→4th X OFF ON→OFF OFF ON OFF OFF→ON D2 1st X ON ON OFF ON OFF ON 2nd (E/B)→4th X ON→OFF ON→OFF ON→OFF ON OFF OFF→ON D1 1st (E/B) X ON ON OFF ON OFF OFF Tech Tips
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*2: Actual gear shift (gear position) under fail-safe operation.
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X: OFF (the ECM stops sending current to a malfunctioning solenoid valve)
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→: Condition in the electrical malfunction is shown on the left of "→".
Condition in the fail-safe mode is shown on the right of "→".
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(E/B): Engine brake
Shift Lever Position Shift solenoid Valve S2 Electrical Malfunction (P0976, P0977) Gear*2 Shift solenoid (ECM output) S1 S2 S3 S4 SR SL1 SL2 D 3rd OFF→ON X ON OFF ON OFF ON 3rd ON X ON OFF ON OFF ON 3rd ON X ON OFF ON OFF ON 4th ON X OFF OFF ON OFF ON 5th ON X OFF ON OFF ON OFF 5th ON X OFF ON OFF ON OFF D5 3rd OFF→ON X ON OFF ON OFF ON 3rd ON X ON OFF ON OFF ON 3rd ON X ON OFF ON OFF ON 4th ON X OFF OFF ON OFF ON 5th ON X OFF ON OFF ON OFF D4 3rd OFF→ON X ON OFF ON OFF ON 3rd ON X ON OFF ON OFF ON 3rd ON X ON OFF ON OFF ON 4th ON X OFF OFF ON OFF ON D3 3rd→3rd (E/B) OFF→ON X ON OFF ON OFF ON→OFF 3rd→3rd (E/B) ON X ON OFF ON OFF ON→OFF 3rd (E/B) ON X ON OFF ON OFF OFF D2 3rd→3rd (E/B) OFF→ON X ON OFF ON OFF ON→OFF 3rd (E/B) ON X ON ON→OFF ON OFF OFF D1 3rd (E/B) OFF→ON X ON OFF ON OFF OFF Tech Tips
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*2: Actual gear shift (gear position) under fail-safe operation.
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X: OFF (the ECM stops sending current to a malfunctioning solenoid valve)
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→: Condition in the electrical malfunction is shown on the left of "→".
Condition in the fail-safe mode is shown on the right of "→".
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(E/B): Engine brake
Shift Lever Position Shift solenoid Valve S3 Electrical Malfunction (P0979, P0980) Gear*2 Shift solenoid (ECM output) S1 S2 S3 S4 SR SL1 SL2 D 3rd OFF ON X OFF ON OFF ON 4th ON ON→OFF X OFF ON OFF ON 4th ON OFF X OFF ON OFF ON 4th ON OFF X OFF ON OFF ON 5th ON OFF X ON OFF ON OFF 6th ON ON X ON OFF ON OFF D5 3rd OFF ON X OFF ON OFF ON 4th ON ON→OFF X OFF ON OFF ON 4th ON OFF X OFF ON OFF ON 4th ON OFF X OFF ON OFF ON 5th ON OFF X ON OFF ON OFF D4 3rd OFF ON X OFF ON OFF ON 4th ON ON→OFF X OFF ON OFF ON 4th ON OFF X OFF ON OFF ON 4th ON OFF X OFF ON OFF ON D3 3rd OFF ON X OFF ON OFF ON 4th ON ON→OFF X OFF ON OFF ON 4th ON OFF X OFF ON OFF OFF→ON D2 3rd OFF ON X OFF ON OFF ON 6th→4th ON ON→OFF X ON→OFF ON OFF OFF→ON D1 1st OFF ON X OFF ON OFF OFF Tech Tips
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*2: Actual gear shift (gear position) under fail-safe operation.
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X: OFF (the ECM stops sending current to a malfunctioning solenoid valve)
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→: Condition in the electrical malfunction is shown on the left of "→".
Condition in the fail-safe mode is shown on the right of "→".
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(E/B): Engine brake
Shift Lever Position Shift Solenoid Valve S4 Electrical Malfunction (P0982, P0983) Gear*2 Shift solenoid (ECM output) S1 S2 S3 S4 SR SL1 SL2 D 1st OFF ON ON X ON OFF ON 2nd ON ON ON X ON OFF ON 3rd ON OFF ON X ON OFF ON 4th ON OFF OFF X ON OFF ON 4th ON OFF OFF X OFF→ON ON→OFF OFF→ON 4th ON ON→OFF OFF X OFF→ON ON→OFF OFF→ON D5 1st OFF ON ON X ON OFF ON 2nd ON ON ON X ON OFF ON 3rd ON OFF ON X ON OFF ON 4th ON OFF OFF X ON OFF ON 4th ON OFF OFF X OFF→ON ON→OFF OFF→ON D4 1st OFF ON ON X ON OFF ON 2nd ON ON ON X ON OFF ON 3rd ON OFF ON X ON OFF ON 4th ON OFF OFF X ON OFF ON D3 1st OFF ON ON X ON OFF ON 2nd ON ON ON X ON OFF ON 3rd (E/B) ON OFF ON X ON OFF OFF D2 1st OFF ON ON X ON OFF ON 2nd ON ON ON X ON OFF OFF D1 1st (E/B) OFF ON ON X ON OFF OFF Tech Tips
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*2: Actual gear shift (gear position) under fail-safe operation.
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X: OFF (the ECM stops sending current to a malfunctioning solenoid valve)
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→: Condition in the electrical malfunction is shown on the left of "→".
Condition in the fail-safe mode is shown on the right of "→".
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(E/B): Engine brake
Shift Lever Position Shift Solenoid Valve SR Electrical Malfunction (P0985, P0986) Gear*2 Shift solenoid (ECM output) S1 S2 S3 S4 SR SL1 SL2 D 1st OFF ON ON OFF X OFF ON 2nd ON ON ON OFF X OFF ON 3rd ON OFF ON OFF X OFF ON 4th ON OFF OFF OFF X OFF ON 5th ON OFF OFF ON X ON OFF 6th ON ON OFF ON X ON OFF D5 1st OFF ON ON OFF X OFF ON 2nd ON ON ON OFF X OFF ON 3rd ON OFF ON OFF X OFF ON 4th ON OFF OFF OFF X OFF ON 5th ON OFF OFF ON X ON OFF D4 1st OFF ON ON OFF X OFF ON 2nd ON ON ON OFF X OFF ON 3rd ON OFF ON OFF X OFF ON 4th ON OFF OFF OFF X OFF ON D3 1st OFF ON ON OFF X OFF ON 2nd ON ON ON OFF X OFF ON 3rd (E/B) ON OFF ON OFF X OFF OFF D2 1st OFF ON ON OFF X OFF ON 2nd (E/B) ON ON ON ON X OFF OFF D1 1st (E/B) OFF ON ON OFF X OFF OFF Tech Tips
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*2: Actual gear shift (gear position) under fail-safe operation.
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X: OFF (the ECM stops sending current to a malfunctioning solenoid valve)
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→: Condition in the electrical malfunction is shown on the left of "→".
Condition in the fail-safe mode is shown on the right of "→".
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(E/B): Engine brake
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Fail-safe operation for mechanically malfunction:
Tech Tips
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: DTC Condition Gear*2 - Normal 1st 2nd 3rd 4th 5th 6th P0751 Shift solenoid valve S1:
Stuck OFF malfunction
1st*3 1st*3 ↑ 3rd 3rd 3rd P0761 Shift solenoid S3:
Stuck ON malfunction
1st 2nd ↑ 3rd 3rd 3rd P0766 Shift solenoid valve S4, Shift solenoid valve SL2 or Valve body (Brake control valve):
Malfunction
1st 2nd ↑ 3rd 3rd 3rd P0781 Valve body (1-2 shift valve):
Malfunction
1st*3 1st*3 ↑ 3rd 3rd 3rd P0729 Valve body (Sequence valve):
Malfunction
1st 2nd ↑ 3rd 3rd 3rd Tech Tips
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*2: Actual gear shift (gear position) under fail-safe operation
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*3: Under engine braking, downshifting to 1st or 2nd gear is prohibited.
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