P0710 – Transmission fluid temperature sensor circuit

System: AT
Dashboard light: Check engine light (MIL)
Check-engine blink code: —
Applies to: 1SZ-FE (by platform)
Description: Transmission fluid temperature sensor circuit
Possible causes: Trouble area: 1.Open or short in fluid temperature sensor circuit 2.Fluid temperature sensor 3.Engine computer (ECM)
What to check: Checking points: 1.Check wiring 2.Check sensor resistance
Confidence: medium (Toyota Echo 1999–2002 factory diagnostics, same XP10 platform; not confirmed on JDM 1SZ-FE)

From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights