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
|
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 |
|
.gif)
).
(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:
Parts Location
PARTS LOCATION
ILLUSTRATION
*A
for Automatic Transmission
*B
for Manual Transmission
*C
for 4WD
-
-
*1
FRONT SPEED SENSOR LH
*2
FRONT SPEED SENSOR RH
...
Initialization
INITIALIZATION
NOTICE:
Initialization can only be performed for vehicles with a tire pressure
warning reset switch.
If initialization is performed, the existing tire positions will be
cleared, but will be automatically identified when the vehicle is driven
at 37 km/h (23 mp ...
Check Bus 2 Lines for Short Circuit
DESCRIPTION
There may be a short circuit between the CAN main bus lines and/or CAN branch
lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central
gateway ECU (network gateway ECU) is below 54 Ω.
Detection Item
Trouble Area
Resi ...
