Honda 2004 Odyssey Service Manual page 421

PGM-FI System
DTC Troubleshooting (cont'd)
DTC P0122 '01 Model:
Low Voltage
1. Start the engine. Hold the engine at 3,000 rpm with
no load (in Park or neutral) until the radiator fan
comes on, then turn the ignition switch OFF.
2. Turn the ignition switch ON (II).
3. Check the throttle position with the scan tool or the
HDS.
Is there about 10 % or 0.5 V when the throttle is
f ully closed and about 90 % or 4.5 V when the
throttle is f ully opened?
YES Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the TP sensor and the PCM.
NO Go to step 4.
4. Turn the ignition switch OFF.
5. Disconnect the TP sensor 3P connector.
6. Turn the ignition switch ON (II).
7. Measure voltage between TP sensor 3P connector
terminals No. 1 and No. 3.
TP SENSOR 3P CONNECTOR
SG2 (GRN/BLK)
Wire side of female terminals
Is there about 5 V ?
YES Go to step 8.
NO Go to step 15.
8. Turn the ignition switch OFF.
11-112
TP Sensor Circuit
VCC2 (YEL/BLU)
9. At the sensor side, measure resistance between TP
sensor 3P connector terminals No. 1 and No. 2 with
the throttle fully closed.
TP SENSOR 3P CONNECTOR
SG2
Terminal side of male terminals
Is there about 0.5 0.9 k
YES Go to step 10.
NO Replace the throttle body.
10. Measure resistance between the TP sensor 3P
connector terminals No. 2 and No. 3 with the
throttle fully closed.
TP SENSOR 3P CONNECTOR
TPS
Terminal side of male terminals
Is there about 4.5 k
YES Go to step 11.
NO Replace the throttle body.
11. Disconnect PCM connector A (31P).
TPS
?
VCC2
?