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Home >> Lexus >> 2003 >> LS 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input) >> Circuit Description

Circuit Description

Transmission range sensor is also referred to as park/neutral position switch. The park/neutral position switch detects the shift lever position and sends signals to the ECM. The ECM receives signals (P, R, N, D, 4, 3, 2 and L) from the park/neutral position switch. When the signal is not sent to the ECM from the park/neutral position switch, the ECM judges that the shift lever is in "D" position. When the shift lever is in the 4 position (with transmission control switch for "D" and "4" pressed), "4" in the shift position indicator light will come on and when the shift lever is in the "D" position (with transmission control switch for "D" and "4" released), "D" in the shift position indicator light will come on. When the shift lever is in the "L" position (with transmission control switch for "2v and "L" pressed), "L" in the shift position indicator light will come on and when the shift lever is in the "2" position (with transmission control switch for "2" and "L" released), "2" in the shift position indicator light will come on. DTC is set when all switches are OFF simultaneously for P, R, N, D, 3 and 2 positions, or when 2 or more switches are ON simultaneously for P, R, N, (D 4), 3 and (2 L) positions. Possible causes are:

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