Toyota Tacoma 2015-2018 Service Manual: Vehicle Position Mark Deviates Greatly
CAUTION / NOTICE / HINT
NOTICE:
- If standard size tires are not installed, the vehicle position mark may deviate from the route even if the navigation system is operating normally.
- Make sure that standard size tires are installed to the vehicle before inspection.
PROCEDURE
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1. |
CHECK CABIN |
(a) Check the cabin for any object that might interrupt radio reception on the instrument panel. If such an object exists, remove it and check if the vehicle position mark returns to the appropriate position.
HINT:
The GPS uses extremely faint radio waves originating from satellites. If the signal is interrupted by obstructions or other radio waves, the GPS may not be able to properly receive the signal.
OK:
After driving for a while, the vehicle position mark returns to the appropriate position.
| OK | .gif) |
NORMAL OPERATION |
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2. |
CHECK SURROUNDINGS |
(a) Check if the vehicle is in a location where GPS signal reception is poor. If the vehicle is in such a location, move the vehicle and check if the vehicle position mark returns to the appropriate position.
HINT:
The GPS uses 24 satellites in 6 orbits. At any point in time, 4 satellites should be able to pinpoint your vehicle. However, GPS signals may not reach the vehicle due to influence from the surroundings, vehicle direction and time. For examples, see the following illustration.
Text in Illustration
|
*a |
Example |
*b |
In a tunnel |
|
*c |
In a building |
*d |
Under an overpass |
|
*e |
On a forest or tree-lined path |
*f |
Between tall buildings |
|
*g |
Under a cliff or overhang |
- |
- |
OK:
After driving for a while, the vehicle position mark returns to the appropriate position.
| OK | |
SYSTEM RETURNS TO NORMAL |
|
|
3. |
CHECK GPS INFORMATION (OPERATION CHECK) |
|
(a) Enter the "System Sensor Check" screen. Refer to Check GPS & Vehicle
Sensors in Operation Check (See page |
|
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).
(b) Check how many of the following codes appear in the "Reception number" column.
HINT:
T or P appears.
OK:
At least 3 codes appear.
| OK | |
REPLACE NAVIGATION RECEIVER ASSEMBLY |
| NG | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
Poor Sound Quality in All Modes (Low Volume)
PROCEDURE
1.
CHECK AUDIO SETTINGS
(a) Set "Treble", "Mid" and "Bass" to the initial values and check that sound
is normal.
OK:
Malf ...
Cursor or Map Rotates when Vehicle Stopped
PROCEDURE
1.
CHECK CONDITION
(a) Check with the customer if the vehicle has been turned by a turntable.
OK:
Vehicle has not been turned by a turntab ...
Other materials:
Zero Point Calibration of Yaw Rate Sensor Undone (C1210,C1336)
DESCRIPTION
The skid control ECU (brake actuator assembly) receives signals from the yaw
rate and acceleration sensor (airbag sensor assembly) via the CAN communication
system.
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and
detects the vehicle condition. If th ...
Other System Malfunction (C1A63)
DESCRIPTION
The millimeter wave radar sensor assembly receives accelerator pedal position
sensor signals from the ECM to determine if the accelerator pedal is being depressed.
If the ECM detects a malfunction in the accelerator pedal position sensor or SFI
system, the millimeter wave radar se ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY
(a) Check the resistance.
Text in Illustration
*a
Component without harness connected
(Windshield Wiper Switch Assembly)
(1) Measure the resistance according ...