Honda CR-V 1997 Service Manual page 592

Electrical Troubleshooting ('97 Model)
Troubleshooting Flowchart - Countershaft Speed Sensor
• OBD 11 Scan Tool indicates Code
Possible Cause
P0720.
• Loose or faulty connection between
• Self-diagnosis
~
indicator light
the PCM and vehicle harness
blinks nine times.
• Disconnected countershaft speed
sensor connector
• Short or open in countershaft speed
sensor wire
• Faulty countershaft speed sensor
Check and record the freeze data
in case it is needed later for prob-
lem verification.
If the Honda PGM
Tester is available:
. _.-
- - - - - - - -
- - - - -
- - - - - - - - -
-
- - - - - - - - - - - - -
- - - - -
Connect the Honda PGM Tester,
and test-drive the vehicle with
the tester in Data Link or Snap-
Shot mode. Make sure the coun-
tershaft speed sensor reads the
same as the vehicle speed sensor
IVSS).
The countershaft speed sensor is
Do both sensors read the
YES
OK at this time. Verify that all
same speed?
connectors in the circuit are
making good contact.
NO
- - - - - - - - - - - - -
1--
- - - - - - - - - - - -
- - - - - - - - -
- - - - -
- - - - - - - -
Check the countershaft speed
sensor installation , and check it
for damage.
Is the countershaft speed sen-
NO
sor installed properly, and not
Reinstall or replace and recheck.
damaged?
YES
Measure Countershaft Speed Sen-
sor Resistance at the Sensor Con-
nector:
,.
Disconnect the 2P conn ector
from the countershaft speed
sensor connector.
2.
Measure the resistance of the
countershaft speed sensor.
"
NO
Replace the countershaft speed
Is the resistance 400 - 600
m
./ sensor.
YES
To page 14-77
14-76
I
)
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COUNTERSHAFT SPEEO SENSOR
CONNECTOR
Terminal side of male terminals