Honda Accord 2008 Manual page 2634

07/11/02 10:04:16 61TA0000_230_0190
Yaw Rate Tuning
This diagnostic allows you to graphically display
problems with the yaw rate sensor.
• The ANG-Disp value accumulates any differences
between the offset, and sensor voltages (see Yaw
Rate diagnostic). When the sensor is functioning
properly, the random changes in these two voltages
generally cancels out, so the value is 0. However if
one voltage is consistently higher than the other, then
the ANG-Disp value accumulates the constant change.
• The Reset button temporarily clears the angular
accumulation (ANG-Disp), and clears the display dots.
• Do not touch the CCW, CW, or Set buttons. These are
used for factory setup only.
Two tests are explained below. For large problems with
the sensor values, the stationary test usually confirms
whether the sensor is defective. For yaw rate issues
related to driving, do the road test described below.
1. Stationary test: If the VP icon spins in place and the
ANG-Disp value slowly increases or decreases in
value, the yaw rate sensor is defective. Replace the
navigation control unit.
2. Road test: Drive the vehicle on a very straight road.
Enter the diagnostic mode, select Yaw rate, and
touch the Tuning button. While driving down a
straight road, the white dots should trace a straight
line across the screen. However, if you are driving
on a straight road, and you notice the dots
constantly dropping down or heading up as you
drive, the navigation control unit's yaw sensor is
defective. You can touch Reset to clear ANG-Disp,
and dotted lines.
If either test above fails, please enter Yaw rate
sensor defective for the problem description, on
the Navigation core return form.
NOTE: The CCW, CW and Set buttons are disabled
and cannot be activated.
＊３６
Tuning
0.0% Return
ANG- Disp
0°
Reset CCW CW Set
Car Status
Use this screen to confirm that the navigation unit is
properly receiving input signals. Signals equal to (0) are
OFF, and signals equal to (1) are ON. If the value on the
display does not match the actual vehicle status, then
check the wire carrying the signal.
• VSP-Vehicle Speed Pulse from PCM
(Pin 6 of A-connector)
a) OFF (0) when vehicle is not moving
b) ON (1) when vehicle is moving
The VSP comes from the PCM as a dedicated signal.
Internally, the navigation unit compares the actual VP
on the map against street data to adjust the pulse to
speed scaling factor. As this scaling factor becomes
more accurate, the Level gradually increases from 0 to
10 (see the Tire Calibrate diagnostic screen).
• BACK-Reverse indication from taillight relay
(Pin 5 of A-connector)
a) OFF (0) when the shift lever is in any position other
than reverse
b) ON (1) when the shift lever is in reverse
The Back signal is used by the navigation unit to allow
the map screen to show the VP moving backwards
when in reverse. This signal is needed because the
Speed Pulse has no direction indication.
Car Status
ILL
VSP 0
BACK 0 ILL CANCEL
0
IGNITION
＊３７
Return
0
0
(cont'd)
23-189