Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA20104 RUNNER 2WD L4-2.7L (2TR-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWFAIL-SAFE CHART
2010 Toyota 4 Runner 2WD L4-2.7L (2TR-FE)
Fail-Safe Chart
2010 Toyota 4 Runner 2WD L4-2.7L (2TR-FE)SECTION Fail-Safe Chart
A343E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: FAIL-SAFE CHART
1. Fail-safe
This function minimizes the loss of ECT functions when a malfunction occurs in a sensor or solenoid.
2. Fail-safe control list
HINT
*: In addition to the switching of the shift pattern, Artificial Intelligence Shift (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 valve (S1 and S2).
(1) Fail-safe function
If either of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoid valve ON and OFF in order to shift into the gear positions shown in the table below. Also, the ECM stops sending current to the open or short-circuited solenoid.
Even if starting the engine again in fail-safe mode, the gear position remains in the same position.
HINT
X: OFF (the ECM stops sending current to the malfunctioning solenoid valve).
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.