DTC Troubleshooting: P0137, P0157 (V6) - Honda Accord CR/CT 2012-2017

DTC Troubleshooting: P0137, P0157

DTC P0137: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage
DTC P0157: Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage

NOTE:

	Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
	Information marked with an asterisk (*) applies to the front bank (Bank 2).

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0137 Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage
P0157 Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage

Problem verification:

Problem verification

?1.	Press the engine start/stop button to select the ON mode.

?2.	Clear the DTC with the HDS.

?3.	Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.

?4.

Monitor the OBD STATUS for DTC P0137 and/or P0157^* in the DTCs MENU with the HDS.

DTC Description	OBD STATUS
P0137 Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage
P0157 Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage

Does the HDS indicate FAILED?


	YES

The failure is duplicated. Go to step 2.


	NO

If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 1-3 and recheck.

Determine possible failure area (Secondary HO2S (Sensor 2), others):

Determine possible failure area (Secondary HO2S (Sensor 2), others)

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

Secondary HO2S (Sensor 2) 4P connector

?3.

Connect terminals A and B with a jumper wire.

Rear bank (Bank 1):

Terminal A	Secondary HO2S (Sensor 2) 4P connector No. 1 (WHT)
Terminal B	Secondary HO2S (Sensor 2) 4P connector No. 2 (GRN)

Front bank (Bank 2) (J35Y1 engine):

Terminal A	Secondary HO2S (Sensor 2) 4P connector No. 1 (BLU)
Terminal B	Secondary HO2S (Sensor 2) 4P connector No. 2 (YEL)

Front bank (Bank 2) (J35Y2 engine):

Terminal A	Secondary HO2S (Sensor 2) 4P connector No. 1 (YEL)
Terminal B	Secondary HO2S (Sensor 2) 4P connector No. 2 (BLU)

?4.	Press the engine start/stop button to select the ON mode.

?5.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
HO2S B1 S2	Less than 0.12	V
HO2S B2 S2	Less than 0.12	V

Do the current condition(s) match the threshold?


	YES

Go to step 3.


	NO

Replace secondary HO2S (Sensor 2), then do the repair verification.

Determine possible failure area (short in SO2 line, short in SO2SG line):

Determine possible failure area (short in SO2 line, short in SO2SG line)

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.

?3.	Press the engine start/stop button to select the ON mode.

?4.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
HO2S B1 S2	about 5.0	V
HO2S B2 S2	about 5.0	V

Do the current condition(s) match the threshold?


	YES

Go to step 4.


	NO

Go to step 5.

Shorted wire check (SO2SGB1 (SO2SGB2)^* line):

Shorted wire check (SO2SGB1 (SO2SGB2)^* line)

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connectors.

PCM connector C (51P)

Secondary HO2S (Sensor 2) 4P connector

?4.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector C (51P): disconnected
	Secondary HO2S (Sensor 2) 4P connector: disconnected
Test circuit	SO2SGB1 (SO2SGB2)^*
Test point 1	PCM connector C (51P) No. 39 (WHT)
	PCM connector C (51P) No. 40 (YEL)^*
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the SO2SGB1 (SO2SGB2)^* wire between the PCM (C39 (C40)^*) and secondary HO2S (Sensor 2), then do the repair verification.


	NO

The SO2SGB1 (SO2SGB2)^* wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.

Shorted wire check (SO2B1 (SO2B2)^* line):

Shorted wire check (SO2B1 (SO2B2)^* line)

?1.	Press the engine start/stop button to select the OFF mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connector.

PCM connector C (51P)

?4.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	PCM connector C (51P): disconnected
	Secondary HO2S (Sensor 2) 4P connector: disconnected
Test circuit	SO2B1 (SO2B2)^*
Test point 1	PCM connector C (51P) No. 30 (GRN)
	PCM connector C (51P) No. 31 (BLU)^*
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the SO2B1 (SO2B2)^* wire between the PCM (C30 (C31)^*) and secondary HO2S (Sensor 2), then do the repair verification.


	NO

The SO2B1 (SO2B2)^* wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.

Repair verification (OBD STATUS check):

?1.	Reconnect all connectors.

?2.	Exit the SCS mode with the HDS.

?3.	Press the engine start/stop button to select the ON mode.

?4.	Reset the PCM with the HDS.

?5.	Do the PCM idle learn procedure.

?6.	Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?7.

Monitor the OBD STATUS for DTC P0137 and/or P0157^* in the DTCs MENU with the HDS.

DTC Description	OBD STATUS
P0137 Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage
P0157 Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage

Does the HDS indicate PASSED, FAILED, EXECUTING, or OUT OF CONDITION?


	PASSED (P0137)

Troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?


	PASSED (P0157)

Troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?


	FAILED (P0137)

Go to step 1 and recheck. If the PCM was updated, substitute a known-good PCM, then check the OBD STATUS again.


	FAILED (P0157)

Go to step 1 and recheck. If the PCM was updated, substitute a known-good PCM, then check the OBD STATUS again.


	EXECUTING

Keep the test condition until a result comes on.


	OUT OF CONDITION

Meet the test condition, and check the OBD STATUS again.