P0137
DTC P0137: Secondary HO2S (Sensor 2) Circuit Low Voltage1. Turn the ignition switch ON (II).
2. Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Check the AF FB AVG in the DATA LIST with the Honda PGM Tester or the HDS.
Is the value 1.00 or more?
YES - Go to step 5.
NO - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1.
5. Check the HO2S S2 in the DATA LIST with the Honda PGM Tester or the HDS.
Does the voltage stay at 0.29 V or less?
YES - Go to step 6.
NO - Go to step 10.
6. Turn the ignition switch OFF.
7. Disconnect the secondary HO2S (Sensor 2) 4P connector.
8. Turn the ignition switch ON (II).
9. Check the HO2S S2 in the DATA LIST with the Honda PGM Tester or the HDS.
Does the voltage stay at 0.29 V or less?
YES - Go to step 12.
NO - Go to step 16.
10. Test-drive under the following conditions.
- Engine coolant temperature more than 158 °F (70 °C)
- A/T in D position (M/T in 4th gear)
- Engine speed at 2,000 - 3,000 rpm
- Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
11. Monitor the OBD STATUS for DTC P0137 in the DTCs MENU with the Honda PGM Tester or the HDS.
Does the screen indicate FAILED?
YES - Go to step 16.
NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates Out of CONDITION, go to step 10 and recheck.
12. Turn the ignition switch OFF.
13. Jump the SCS line with the Honda PGM Tester or the HDS.
14. Disconnect ECM/PCM connector E (31P).
15. Check for continuity between Secondary HO2S (Sensor 2) 4P connector terminal No.2 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (E20) and the secondary HO2S (Sensor 2), then go to step 18.
NO - Go to step 25.
16. Turn the ignition switch OFF.
17. Replace the secondary HO2S (Sensor 2).
18. Turn the ignition switch ON (II).
19. Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS.
20. Do the ECM/PCM idle learn procedure.
21. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
22. Test-drive under the following conditions.
- Engine coolant temperature more than 158 °F (70 °C)
- A/T in D position (M/T in 5th gear)
- Engine speed at 2,000 - 3,000 rpm
- Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
23. Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0137 is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P0137 in the DTCs MENU with the Honda PGM Tester or the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates Out of CONDITION, go to step 21 and recheck.
25. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
26. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
27. Test-drive under the following conditions.
- Engine coolant temperature more than 158 °F (70 °C)
- A/T in D position (M/T in 5th gear)
- Engine speed at 2,000 - 3,000 rpm
- Drive about 10 minutes, then decelerate (with the throttle fully closed) for 5 seconds
28. Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0137 is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.