Toyota Sienna Service Manual: Transmission Range Sensor Circuit Malfunction (PRNDL Input)
DESCRIPTION
The park/neutral position switch detects the shift lever position and sends signals to the ECM.
MONITOR DESCRIPTION
These DTCs indicate a problem with the park/neutral position switch and the wire harness in the park/ neutral position switch circuit.
The park/neutral position switch detects the shift lever position and sends a signal to the ECM.
For security, the park/neutral position switch detects the shift lever position so that engine can be started only when the shift lever is in the P or N position The park/neutral position switch sends a signal to the ECM according to the shift position (P, R, N or D).
The ECM determines that there is a problem with the switch or related parts if in receives more than 1 position signal simultaneously. The ECM will turn on the MIL and store the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
1. One of the following conditions are met: Condition (A), (B), (C) and (D)
COMPONENT OPERATING RANGE
WIRING DIAGRAM
1 INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY
(a) Disconnect the park/neutral position switch connector.
(b) Measure resistance according to the value(s) in the table below when the shift lever is moved to each position.
Standard resistance
2 INSPECT SHIFT LOCK CONTROL UNIT ASSEMBLY
(a) Connect the park/neutral position switch connector.
(b) Disconnect the transmission control switch connector of shift lock control unit assembly.
(c) Measure resistance according to the value(s) in the table below when the shift lever is moved to each position.
Standard resistance
3 CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)
(a) Connect the transmission control switch connector of shift lock control unit assembly.
(b) Turn the ignition switch to the ON position, and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.
Standard voltage
HINT: *: The voltage will drop slightly due to lighting up of the back up light.
REPLACE ECM
Diagnostic trouble code chart
If a DTC is displayed during the DTC check, check the parts
listed in the table below and proceed to the page given.
HINT:
*1: Comes on MIL (Malfunction Indicator Lamp) light up
*2: "DT ...
Transmission Fluid Temperature Sensor "A"
DESCRIPTION
The ATF (Automatic Transmission Fluid) temperature sensor converts the fluid
temperature into a
resistance value which is input into the ECM.
The ECM applies a voltage to the te ...
Other materials:
On-vehicle inspection
HINT:
The type of ignition switch on this model differs according to
the specifications of the vehicle. For the expressions used in
this section, refer to the "EXPRESSIONS OF IGNITION
SWITCH" precaution (See page ES-1).
1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM
(a) Connect the inte ...
Sound Signal Circuit between Radio Receiver and Television Display
Assembly
DESCRIPTION
The television display assembly sends a sound signal to the radio receiver
through this circuit.
The sound signal that has been sent is amplified by the stereo component
amplifier or radio receiver
(built-in amplifier), and then is sent to the speakers.
If there is an open or ...
Road test
1. PROBLEM SYMPTOM CONFIRMATION
Inspect the SET function.
Turn the cruise control main switch on.
Drive at the required speed between 40 km/h
(25 mph) and 200 km/h (125 mph).
Push the cruise control main switch to -
(COAST)/SET.
After releasing t ...