Acura CSX. Instruction — page 109

01

02

SNR9AA7K72100090141FAAT00

DTC P0141:

YES

NO

YES

NO

YES

NO

YES

NO

11-110

PGM-FI System

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

Secondary HO2S (Sensor 2)

Heater Circuit Malfunction

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Start the engine.

4. Check for Temporary DTCs or DTCs with the HDS.

Go to step 5.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the secondary HO2S (Sensor 2) and the ECM/
PCM.

5. Turn the ignition switch to LOCK (0).

6. Check the No. 3 ALTERNATOR (10 A) fuse in the

under-dash fuse/relay box.

Go to step 7.

Repair short in the wire between the

secondary HO2S (Sensor 2) and the No. 3
ALTERNATOR (10 A) fuse. Also replace the No. 3
ALTERNATOR (10 A) fuse, then go to step 23.

7. Disconnect the secondary HO2S (Sensor 2) 4P

connector.

8. At the secondary HO2S (Sensor 2) side, measure

the resistance between secondary HO2S (Sensor 2)
4P connector terminals No. 3 and No. 4.

Go to step 9.

Go to step 22.

9. At the secondary HO2S (Sensor 2) side, check for

continuity between body ground and secondary
HO2S (Sensor 2) 4P connector terminals No. 3 and
No. 4 individually.

Go to step 22.

Go to step 10.

Wire side of female terminals

Wire side of female terminals

Is DT C P0141 indicated?

Is the f use OK ?

Is ther e 5.4

7 .3

at r oom temper atur e?

Is ther e continuity?

08/08/21 14:17:23 61SNR030_110_0110

03

04

05

YES

NO

YES

NO

YES

NO

11-111

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

SO2SHTC (PNK)

IG1 (YEL)

ECM/PCM CONNECTOR B (44P)

SO2SHTC (BLK/WHT)

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

IG1 (YEL)

10. Turn the ignition switch to ON (II).

11. Measure the voltage between secondary HO2S

(Sensor 2) 4P connector terminals No. 3 and No. 4.

Go to step 12.

Go to step 16.

12. Turn the ignition switch to LOCK (0).

13. Jump the SCS line with the HDS.

14. Disconnect ECM/PCM connector B (44P).

15. Check for continuity between ECM/PCM connector

terminal B4 and body ground.

Repair short in the wire between the ECM/

PCM (B4) and the secondary HO2S (Sensor 2), then
go to step 23.

Go to step 29.

16. Measure the voltage between secondary HO2S

(Sensor 2) 4P connector terminal No. 4 and body
ground.

Go to step 17.

Repair open in the wire between the

secondary HO2S (Sensor 2) and the No. 3
ALTERNATOR (10 A) fuse, then go to step 23.

Terminal side of male terminals

Terminal side of female terminals

Terminal side of male terminals

Is ther e batter y voltage?

Is ther e continuity?

Is ther e batter y voltage?

08/08/21 14:17:23 61SNR030_110_0111

06

07

YES

NO

YES

NO

YES

NO

11-112

PGM-FI System

SECONDARY HO2S (SENSOR 2) 4P CONNECTOR

SO2SHTC (PNK)

JUMPER WIRE

ECM/PCM CONNECTOR B (44P)

SO2SHTC (BLK/WHT)

17. Turn the ignition switch to LOCK (0).

18. Jump the SCS line with the HDS.

19. Disconnect ECM/PCM connector B (44P).

20. Connect secondary HO2S (Sensor 2) 4P connector

terminal No. 3 to body ground with a jumper wire.

21. Check for continuity between ECM/PCM connector

terminal B4 and body ground.

Go to step 29.

Repair open in the wire between the ECM/

PCM (B4) and the secondary HO2S (Sensor 2), then
go to step 23.

22. Replace the secondary HO2S (Sensor 2) (see page

11-221).

23. Reconnect all connectors.

24. Turn the ignition switch to ON (II).

25. Reset the ECM/PCM with the HDS.

26. Do the ECM/PCM idle learn procedure (see page

11-310).

27. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the secondary HO2S (Sensor 2) and
the ECM/PCM, then go to step 1.

Go to step 28.

28. Monitor the OBD STATUS for DTC P0141 in the

DTCs MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 27,
go to the indicated DTC’s troubleshooting.

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 NOT COMPLETED, keep
idling until a result comes on.

Terminal side of male terminals

Terminal side of female terminals

Is ther e continuity?

Is DT C P0141 indicated?

Does the scr een indicate PASSED?

08/08/21 14:17:24 61SNR030_110_0112

SNR9AA7K72100090171FAAT00

YES

NO

YES

NO

YES

NO

DTC P0171:

DTC P0172:

11-113

11-113

29. Reconnect all connectors.

30. Update the ECM/PCM if it does not have the latest

software (see page 11-227), or substitute a known-
good ECM/PCM (see page 11-7).

31. Start the engine, and let idle.

32. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the secondary HO2S (Sensor 2) and
the ECM/PCM. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see page 11-7),
then go to step 31. If the ECM/PCM was substituted,
go to step 1.

Go to step 33.

33. Monitor the OBD STATUS for DTC P0141 in the

DTCs MENU with the HDS.

If the ECM/PCM was updated,

troubleshooting is complete. If the ECM/PCM was
substituted, replace the original ECM/PCM
(see page 11-228). If any other Temporary DTCs or
DTCs were indicated in step 32, go to the indicated
DTC’s troubleshooting.

If the screen indicates FAILED, check for poor

connections or loose terminals at the secondary
HO2S (Sensor 2) and the ECM/PCM. If the ECM/
PCM was updated, substitute a known-good ECM/
PCM (see page 11-7), then go to step 31. If the ECM/
PCM was substituted, go to step 1. If the screen
indicates NOT COMPLETED, keep idling until a
result comes on.

NOTE:

• Before you troubleshoot, record all freeze data and

any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

• If any of the DTCs listed below are indicated at the

same time as DTC P0171 and/or P0172, troubleshoot
those DTCs first, then recheck for P0171 and/or P0172.

P0101, P0102, P0103: Mass air flow (MAF) sensor
P0107, P0108, P1128, P1129: Manifold absolute
pressure (MAP) sensor
P0133, P1157, P1172, P2195, P2238, P2252, P2A00: Air
fuel ratio (A/F) sensor (Sensor 1)
P0134, P0135: Air fuel ratio (A/F) sensor (Sensor 1)
heater
P0137, P0138, P0139, P2270, P2271: Secondary HO2S
(Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
P0401 , P0404 , P0406 , P2413 : Exhaust gas
recirculation (EGR) system
P0443, P0496: EVAP canister purge valve
P2646, P2647, P2648, P2649: VTEC system

: K20Z2 engine

1. Check the fuel pressure (see page 11-325).

Go to step 2.

• If the pressure is too high, replace the fuel

pressure regulator (see page 11-337), then go to
step 7.

• If the pressure is too low, check the fuel pump,

the fuel feed pipe and the fuel filter. If they are
OK, replace the fuel pressure regulator (see page
11-337), then go to step 7.

Fuel System Too Lean

Fuel System Too Rich

Is DT C P0141 indicated?

Does the scr een indicate PASSED?

Is the f uel pr essur e OK ?

08/08/21 14:17:24 61SNR030_110_0113

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