Vehicle Speed Sensor Signal; Engine Speed Signal - Honda Civic 2002-2003 Service Manual

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OTC 22: Vehicle Speed Sensor Signal
OTC 23: Engine Speed Signal
NOTE:
• If the MIL indicator is ON, troubleshoot the PGM-FI
system first.
• Even though the system is operating normally, the
EPS indicator will come on under the following
conditions.
- Condition 1:
• The vehicle was traveling at least 12.4 mph
(20 km/h), then
• A rapid change in vehicle speed was detected,
then
• The vehicle (or the vehicle speed sensor signal)
stopped for at least 5 seconds, and
• The engine speed was still 1,640 rpm or higher for
at least 5 seconds
- Condition 2:
After the vehicle (or the vehicle speed sensor
signal) has stopped for at least 10 seconds, yet the
engine speed was still 1,640 rpm or higher for at
least 20 seconds.
- Condition 3:
When the vehicle speed is 10 km/h (6.2 mph) or
above and the engine is running at 280 rpm or
below for 3 seconds.
1. Start the engine and check the tachometer.
Is the tachometer working correctly?
YES-·Go to step 2.
NO-Go to step 9.
2. Test-drive the vehicle above 15 km/h (9.3 mph).
Is the speedometer working correctly?
YES-Go to step 3.
NO-Perform the speedometer system
troubleshooting (see page 22-65) .•
3. Block the rear wheels and raise the vehicle, and
make sure it is securely supported.
4. Turn the ignition switch ON (II).
5. Block the right front wheel, and slowly rotate the
left front wheel, and measure the voltage between
EPS control unit connector C (20P) terminal No.7
and body ground.
EPS CONTROL UNIT CONNECTOR C (20PI
VSP
(BLU/WHTI
=
Wire side of female terminals
Does the voltage pulse 0 V and 5 V?
YES-Go to step 6.
NO-Repair open in the wire between the EPS
control unit and the VSS. If the wire is OK,check for
a loose or poor connections at the EPS control unit.
If necessary, substitute a known-good EPS control
unit, and recheck .•
(cont'dl
17-33