Acura TSX / Honda Accord CL. Manual — part 599
Fig. 40: Measuring Voltage Between Secondary HO2S 4P Connector Terminals No. 3 & No. 4
12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connector E (31P).
15. Check for continuity between ECM/PCM connector terminal E21 and body ground.
Is there continuity?
YES: Repair short in the wire between the ECM/PCM (E21) and the secondary HO2S
(Sensor 2), then go to step 24 .
NO: Go to step 29 .
2004 Acura TSX
2004 ENGINE PERFORMANCE PGM-FI System - TSX
Fig. 41: Checking For Continuity Between ECM/PCM Connector Terminal E21 & Body
Ground
16. Measure voltage between secondary HO2S (Sensor 2) 4P connector terminal No. 4 and body ground.
Is there battery voltage?
YES: Go to step 17.
NO: Check the No. 18 ACG (10A) fuse in the under-dash fuse/relay box. If the fuse is OK,
repair open in the wire between the secondary HO2S (Sensor 2) and No. 4 ACG (10A) fuse,
then go to step 24 .
2004 Acura TSX
2004 ENGINE PERFORMANCE PGM-FI System - TSX
Fig. 42: Measuring Voltage Between Secondary HO2S (Sensor 2) 4P Connector Terminal No. 4 &
Body Ground
17. Turn the ignition switch OFF.
18. Jump the SCS line with the HDS.
19. Reconnect the secondary HO2S (Sensor 2) 4P connector.
20. Disconnect ECM/PCM connector E (31P).
21. Turn the ignition switch ON (II).
22. Measure voltage between ECM/PCM connector terminals A5 and E21.
Is there 0.1 V or less?
YES: Repair open in the wire between the ECM/PCM (E21) and the secondary HO2S
(Sensor 2), then go to step 25 .
NO: Go to step 29 .
2004 Acura TSX
2004 ENGINE PERFORMANCE PGM-FI System - TSX
Fig. 43: Measuring Voltage Between ECM/PCM Connector Terminals A5 & E21
23. Replace the secondary HO2S (Sensor 2) (see SECONDARY HO2S REPLACEMENT ).
24. Turn the ignition switch ON (II).
25. Reset the ECM/PCM with the HDS.
26. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
27. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES: If DTC P0141 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 28.
28. Monitor the OBD STATUS for DTC P0141 in the DTCs MENU with 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
2004 Acura TSX
2004 ENGINE PERFORMANCE PGM-FI System - TSX
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