OBD II P0720

BIGWIL32

MEMBER
1997 HONDA ACCORD
4 CYL
FWD
AUTOMATIC
200 MILES

I am getting a CEL on my 97 honda accord, used my scan tool and got P0720, it that the VSS going bad that is located near the thermostat?

Wednesday, April 20th, 2011 AT 11:33 PM

2 Replies

BMRFIXIT

MECHANIC
19,053 POSTS

DTC P0720/9: COUNTERSHAFT SPEED SENSOR
Ensure countershaft speed sensor is installed properly.
Disconnect countershaft speed sensor harness connector.
Using a DVOM, measure resistance between sensor terminals.
If resistance is not 400-600 ohms, replace countershaft speed sensor.
If resistance is 400-600 ohms, disconnect 22-pin TCM harness connector "B".
Check for continuity between ground and 22-pin TCM harness connector "B", terminals No. 8 (Blue/Yellow wire) and No. 9 (Blue/Green wire).
If continuity is present, repair short to ground in Blue/Yellow wire or Blue/Green wire between TCM and countershaft speed sensor.
If continuity is not present, reconnect countershaft speed sensor harness connector.
Measure resistance between 22-pin TCM harness connector "B", terminals No. 8 (Blue/Yellow wire) and No. 9 (Blue/Green wire).
If resistance is 400-600 ohms, check for loose TCM harness connectors.
Replace TCM with a known-good unit if necessary.
If resistance is not 400-600 ohms, repair loose connection or open in Blue/Yellow wire or Blue/Green wire between 22-pin TCM harness connector and countershaft speed sensor harness connector.