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?
Apr 20, 2011 at 11:33 PM
OBD II P0720
1997 HONDA ACCORD
BIGWIL32
- MEMBER
- 13 POSTS
- FOLLOW
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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.
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.
Apr 21, 2011 at 12:26 AM
thanks guys I'll look at it and let you know how it went
Apr 21, 2011 at 12:43 AM
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