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:
When stopping the engine with the shift lever in a position other
than P
If the engine is stopped with the shift lever in a position other than P,
the engine switch will not be turned off but instead be turned to
ACCESSORY mode. Perform the following procedure to turn the
switch off:
Check that the parking brake is set.
Shift the shift lever to P.
Check that t ...
Monitor drive pattern
1. MONITOR DRIVE PATTERN FOR ECT TEST
(a) Perform this drive pattern as one method to
simulate the detection conditions of the ECT
malfunctions. (The DTCs may not be detected due
the actual driving conditions. And some codes may
not be detected through this drive pattern.)
HINT:
Preparation f ...
Radio and Navigation Assembly Power Source Circuit
DESCRIPTION
This is the power source circuit to operate the radio and navigation
assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT RADIO AND NAVIGATION ASSEMBLY
Disconnect the radio and navigation assembly connector
R15.
Measure the resistance according to the value ...