Vss Circuit Malfunction - Honda Civic 2002-2003 Service Manual

PGM-FI System
DTe Troubleshooting (cont'd)
OTe P0500: VSS Circuit Malfunction
1. Test-drive the vehicle.
2. Check the vehicle speed with the scan tool.
Is the correct speed indicated?
YES-Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the VSS and at the ECM .•
NO-Go to step 3.
3. Turn the ignition switch OFF.
4. Block the rear wheels, and set the parking brake.
5. Raise the front of the vehicle, and make sure
it
is
securely supported.
6. Turn the ignition switch ON (II).
7. Block the right front wheel. and slowly rotate the
left front wheel.
8. Measure voltage between ECM connector
terminals A18 and A24.
ECM CONNECTOR A 131P)
1 21314 5 6 71 1/9
10 111121/1/ 15 16 1/118119 20 21
22 23L24)
~
271: 312930 /
LG1i
w---
vss
IBRN/YEL) IWHT/GRN)
Wire side of female terminals
Does the vOltage pulse between 0 V and 5 V or
between OV and battery voltage?
YES-Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). If the symptom/indication
goes away with a known-good ECM, replace the
original ECM .•
NO-Go to step 9.
11-80
9. Turn the ignition switch OFF.
10. Disconnect ECM connector A 131P).
11. Turn the ignition switch ON (II).
12. Block the right front wheel, and slowly rotate the
left front wheel.
13. Measure voltage between ECM connector
terminals A18 and A24.
ECM CONNECTOR A 131 PI
LG1,==--{
IBRN/YELI
9
vss
IWHT/GRNI
Wire side of female terminals
Does the voltage pulse between 0 V and 5 Vor
between OV and battery voltage?
YES-Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). If the symptom/indication
goes away with a known-good ECM, replace the
original ECM .•
NO-Check these items:
• A short or an open in the wire between the ECM
(A18) and the VSS .•
• If the wire is OK, testthe VSS Isee page 22-71) .•
•
•
•