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DIAGNOSTICS
ENGINE (2RZ–FE, 3RZ–FE)
DI–181
443
Author:
Date:
2003 TOYOTA TACOMA (RM1002U)
DTC
P0705
Transmission Range Sensor Malfunction
(PRNDL Input)
DTC
P0850
Park/Neutral Switch Input Circuit
CIRCUIT DESCRIPTION
The park/neutral position switch go on when the shift lever is in the N or P shift position. When it goes on
terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage
becomes 0V. When the shift lever is in the D, 2, L or R position, the park/neutral position switch goes off,
so the voltage of ECM. Terminal NSW becomes battery voltage, the voltage of the ECM internal power
source. If the shift lever is moved from the N position to the D position, this signal is used for air–fuel ratio
correction and for idle speed control (estimated control), etc.
DTC No.
DTC Detection Condition
Trouble Area
2 or more switches are ON simultaneously for P, R, N, D, 2
and L position (2 trip detection logic)
P0705
P0850
When driving under conditions (a) and (b) for 30 sec. or more
park/neutral position switch is ON (N position): (2 trip detection
logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500 – 2,500 rpm
Open in park/neutral position switch circuit
Park/neutral position switch
ECM
HINT:
After confirming DTC P0705 and P0850 use the hand–held tester to confirm the PNP switch signal from the
”DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/PNP SW [NSW]”.
WIRING DIAGRAM
Refer to DTC P0705, P0850 on page DI–482.
INSPECTION PROCEDURE
Refer to DTC P0705, P0850 on page DI–482.
DIA9R–02