Honda ACCORD HYBRID 2005 Service Manual page 941

DTC P0721: Problem in Output Shaft
(Countershaft) Speed Sensor Circuit
NOTE:
• Record all freeze data and review General
Troubleshooting Information (see page 14-4) before
y o u troubleshoot.
• This code is caused by an electrical circuit p r o b l e m
and cannot be caused by a mechanical problem in the
transmission.
1. Record all freeze data, and clear the DTC w i t h the
HDS.
2. Raise the front of the vehicle, or lift the vehicle up,
make sure it is securely s u p p o r t e d , and allow the
front wheels to rotate freely.
3. Start the engine, and run it in the D position at
engine speeds over 2,000 r p m for more than
10 seconds. S l o w d o w n and stop the wheels.
4. M o n i t o r the OBD status for P0721 in the DTCs/
Freeze Data in A/T Mode M e n u for a pass/fail.
Does the result indicate a fail?
Y E S — G o t o step 5.
NO—Intermittent failure, the system is OK at this
t i m e . Check for loose or poor connections at the
PCM and the output shaft (countershaft) speed
sensor connectors. If the tester indicates NOT
COMPLETE, return to step 3 and recheck. •
5. Turn the ignition switch OFF.
6. J u m p the SCS line w i t h the HDS.
7. Disconnect PCM connectors A (31P) and D (17P),
and the output shaft (countershaft) speed sensor
connector.
Check for continuity between PCM connector
terminals A3 and body g r o u n d , and between D16
and body g r o u n d .
PCM C O N N E C T O R S
LG1 (BRN/YEL)
A(31P)
1 2 4 5 6
7
UU
9
10 11 12 13 14 15 16 17 18 19 20 21
/
23 24
n
25 26
n
27 28 29 30 31
D(17P)
1 2
/
4 5 6
/
8 9 10 11 12
13 14
n
15 16 17
L G 2 (BRN)
W i r e side of f e m a l e t e r m i n a l s
Is there continuity?
Y E S — G o to step 9.
NO—Repair an open in the wires between PCM
connector terminals A3, D16, and g r o u n d (G101,
G102), or repair a poor g r o u n d (G101, G102), then
go to step 3 1 .
9. Connect PCM connectors A (31P) and D (17P).
10. Turn the ignition switch ON (II).
11. Measure the voltage between output shaft
(countershaft) speed sensor connector terminal
No. 1 and body g r o u n d .
O U T P U T SHAFT ( C O U N T E R S H A F T )
S P E E D S E N S O R C O N N E C T O R
VCC1 ( Y E L / R E D )
W i r e side of f e m a l e t e r m i n a l s
Is there about 5 V?
Y E S - G o t o step 12.
N O — G o t o step 25.
(cont'd)
14-105