Honda 2004 Odyssey Service Manual page 435

PGM-FI System
DTC Troubleshooting (cont'd)
DTC P0138 '01 Model:
(Sensor 2) Circuit High Voltage
1. Reset the PCM (see page 11-4).
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in Park or neutral) until the radiator fan
comes on.
3. Check the secondary HO2S (Sensor 2) output
voltage at 3,000 rpm with the scan tool or the HDS.
Does the voltage stay at 1.0 V or more?
YES Go to step 4.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the secondary HO2S (Sensor 2) and the PCM.
4. Turn the ignition switch OFF.
5. Disconnect the secondary HO2S (Sensor 2) 4P
connector.
6. Connect secondary HO2S (Sensor 2) 4P connector
terminals No. 1 and No. 2 with a jumper wire.
SECONDARY HO2S
(SENSOR 2) 4P CONNECTOR
JUMPER WIRE
SG3 (GRN/BLK)
Terminal side of male terminals
7. Turn the ignition switch ON (II).
8. Check the secondary HO2S (Sensor 2) output
voltage with the scan tool or the HDS.
Is there 1.0 V or more?
YES Go to step 9.
NO Replace the secondary HO2S (Sensor 2).
11-126
Secondary HO2S
SHO2S (WHT/RED)
9. Turn the ignition switch OFF.
10. Connect PCM connector terminals E7 and E18 with
a jumper wire.
PCM CONNECTORS E (31P)
SG3 (GRN/BLK)
Wire side of female terminals
11. Turn the ignition switch ON (II).
12. Check the secondary HO2S (Sensor 2) output
voltage with the scan tool or the HDS.
Is there 1.0 V or more?
YES Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
NO Repair open in the wire between the PCM
(E7, E18) and the secondary HO2S (Sensor 2).
JUMPER WIRE
SHO2S
(WHT/RED)