Honda 2004 Odyssey Service Manual page 424

DTC P0123 '01 Model:
High 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. At the wire harness side, 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 Replace the throttle body.
NO Go to step 8.
TP Sensor Circuit
VCC2 (YEL/BLU)
8. Measure voltage between PCM connector
terminals A28 and A30.
PCM CONNECTOR A (31P)
SG2 (GRN/BLK)
Wire side of female terminals
Is there about 5 V ?
YES Repair open in the wire between the PCM
(A28) and the TP sensor.
NO Substitute a known-good PCM and recheck
(see page 11-5). If the prescribed voltage is now
available, replace the original PCM.
VCC2
(YEL/BLU)
11-115