Honda Accord 2008 Manual page 469

07/11/02 09:05:55 61TA0000_110_0150
PGM-FI System
DTC Troubleshooting (cont'd)
DTC P0720: Output Shaft (Countershaft)
Speed Sensor Circuit Malfunction
NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Start the engine. Hold the engine speed at
3,000 rpm without load (in neutral) until the
radiator fan comes on, then let it idle.
2. Test-drive several minutes.
3. Check the C SHAFT SPD in the DATA LIST with the
HDS.
Is any vehicle speed indicated?
YES − Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at the output shaft (countershaft) speed sensor and
the ECM.
NO − Go to step 4.
4. Turn the ignition switch to LOCK (0).
5. Disconnect the output shaft (countershaft) speed
sensor 3P connector.
6. Turn the ignition switch to ON (II).
11-150
7. Measure voltage between output shaft
(countershaft) speed sensor 3P connector terminal
No. 1 and body ground.
OUTPUT SHAFT (COUNTERSHAFT)
SPEED SENSOR 3P CONNECTOR
VCC1 (YEL/RED)
Wire side of female terminals
Is there about 5 V ?
−
YES Go to step 8.
NO − Repair open in the wire between the ECM
(C13) and the output shaft (countershaft) speed
sensor, then go to step 18.
8. Measure voltage between output shaft
(countershaft) speed sensor 3P connector terminal
No. 2 and body ground.
OUTPUT SHAFT (COUNTERSHAFT)
SPEED SENSOR 3P CONNECTOR
NC (BLK/WHT)
Wire side of female terminals
Is there about 5 V ?
YES − Go to step 9.
NO − Go to step 10.
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