Evap System Acura TL IV

Scheme 28

Without SH-AWD

Scheme 29

With SH-AWD

Scheme 30

DTC P0443: EVAP Canister Purge Valve Circuit Malfunction

Special Tools Required

Vacuum pump/gauge, 0-30 in Hg, Snap-on YA4000A or equivalent, commercially available

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Scheme 31

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Scheme 36

1. Turn the ignition switch to ON (II), or 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, then let it idle
4. Check for Pending or Confirmed DTCs with the HDS Is DTC P0443 indicated? YES -Go to step 5 NO -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the EVAP canister purge valve and the PCM
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode and allow the engine to cool to below 140°F (60°C)
6. Disconnect the vacuum hose (A) from the purge joint (B) in the engine compartment, and connect a vacuum pump/gauge, 0-30 in Hg, to the hose
7. Start the engine, and let it idle Is there vacuum? YES -Go to step 8 NO -Go to step 14
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
9. Disconnect the EVAP canister purge valve 2P connector
10. Check for continuity between EVAP canister purge valve 2P connector terminal No 1 and body ground Is there continuity? YES -Go to step 11 NO -Go to step 23
11. Jump the SCS line with the HDS
12. Disconnect PCM connector C (49P)
13. Check for continuity between EVAP canister purge valve 2P connector terminal No 1 and body ground Is there continuity? YES -Repair short in the wire between the EVAP canister purge valve and the PCM (C40), then go to step 24 NO -Go to step 30
14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
15. Disconnect the EVAP canister purge valve 2P connector
16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
17. Measure the voltage between EVAP canister purge valve 2P connector terminal No 2 and body ground Is there battery voltage? YES -Go to step 18 NO -Repair open in the wire between the EVAP canister purge valve and the No 13 ACG (15 A) fuse in the driver's under-dash fuse/relay box, then go to step 24
18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
19. Jump the SCS line with the HDS
20. Disconnect PCM connector C (49P)
21. Check for continuity between PCM connector terminal C40 and EVAP canister purge valve 2P connector terminal No 1 Is there continuity? YES -Go to step 22 NO -Repair open in the wire between the EVAP canister purge valve and the PCM (C40), then go to step 24
22. At the valve side, measure the resistance between EVAP canister purge valve 2P connector terminals No 1 and No 2 Is there about 23-26 ohms at room temperature? YES -Go to step 30 NO -Go to step 23
23. Replace the EVAP canister purge valve (see «EVAP CANISTER FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
24. Reconnect all connectors
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
26. Reset the PCM with the HDS
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
28. Check for Pending or Confirmed DTCs with the HDS Is DTC P0443 indicated? YES -Check for poor connections or loose terminals at the EVAP canister purge valve and the PCM, then go to step 1 NO -Go to step 29
29. Monitor the OBD STATUS for DTC P0443 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -Troubleshooting is complete If any other Pending or Confirmed DTCs were indicated in step 28 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the EVAP canister purge valve and the PCM, then go to step 1 If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on
30. Reconnect all connectors
31. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ) or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) )
32. Start the engine, and let it idle
33. Check for Pending or Confirmed DTCs with the HDS Is DTC P0443 indicated? YES -Check for poor connections or loose terminals at the EVAP canister purge valve and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 32 If the PCM was substituted, go to step 1 NO -Go to step 34
34. Monitor the OBD STATUS for DTC P0443 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) f any other Pending or Confirmed DTCs were indicated in step 33 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the EVAP canister purge valve and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 32 If the PCM was substituted, go to step 1 If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on

DTC P0451: FTP Sensor Circuit Range/Performance Problem

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ) If DTC P2422 is stored at the same time as DTC P0451, troubleshoot DTC P2422 first, then recheck for DTC P0451

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Start the engine, and let it idle for 1 minute
4. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS Does the screen indicate FAILED? YES -Go to step 5 NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the FTP sensor and the PCM If the screen indicates NOT COMPLETED, keep idling until a result comes on
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
6. Replace the FTP sensor, without SH-AWD system (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), with SH-AWD system (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
8. Reset the PCM with the HDS
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
10. Start the engine, and let it idle for 1 minute
11. Check for Pending or Confirmed DTCs with the HDS Is DTC P0451 indicated? YES -Check for poor connections or loose terminals at the FTP sensor and the PCM, then go to step 1 NO -Go to step 12
12. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -Troubleshooting is complete If any other Pending or Confirmed DTCs were indicated in step 11 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor and the PCM, then go to step 1 If the screen indicates NOT COMPLETED, keep idling until a result comes on

DTC P0452: FTP Sensor Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Scheme 37

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Scheme 40

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Remove the fuel fill cap
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
6. Check the FTP SENSOR in the DATA LIST with the HDS Is about - 73 kPa (-2 16 in Hg, -55 mmHg), or 0 3V or less indicated? YES -Go to step 10 NO -Go to step 7
7. Install the fuel fill cap
8. Start the engine
9. Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the HDS Does the screen indicate FAILED? YES -Go to step 10 NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the FTP sensor and the PCM If the screen indicates NOT COMPLETED, keep idling until a result comes on
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
11. Disconnect the FTP sensor 3P connector
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
13. Check the FTP SENSOR in the DATA LIST with the HDS Is about -7 3 kPa (-2 16 in Hg, -55 mmHg), or 0 3V or less indicated? YES -Go to step 20 NO -Go to step 14
14. Measure the voltage between FTP sensor 3P connector terminal No 1 and body ground Is there about 5 V? YES -Go to step 24 NO -Go to step 15
15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
16. Jump the SCS line with the HDS
17. Disconnect PCM connector A (49P)
18. Connect FTP sensor 3P connector terminal No 1 to body ground with a jumper wire
19. Check for continuity between PCM connector terminal A25 and body ground Is there continuity? YES -Go to step 32 NO -Repair open in the wire between the PCM (A25) and the FTP sensor, then go to step 26
20. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
21. Jump the SCS line with the HDS
22. Disconnect PCM connector A (49P)
23. Check for continuity between FTP sensor 3P connector terminal No 2 and body ground Is there continuity? YES -Repair short in the wire between the PCM (A39) and the FTP sensor, then go to step 26 NO -Go to step 32
24. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
25. Replace the FTP sensor, without SH-AWD system (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), with SH-AWD system (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
26. Reconnect all connectors
27. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
28. Reset the PCM with the HDS
29. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
30. Check for Pending or Confirmed DTCs with the HDS Is DTC P0452 indicated? YES -Check for poor connections or loose terminals at the FTP sensor and the PCM, then go to step 1 NO -Go to step 31
31. Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -Troubleshooting is complete If any other Pending or Confirmed DTCs were indicated in step 30 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor and the PCM, then go to step 1 If the screen indicates NOT COMPLETED, keep idling until a result comes on
32. Reconnect all connectors
33. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ) or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) )
34. Start the engine, and let it idle
35. Check for Pending or Confirmed DTCs with the HDS Is DTC P0452 indicated? YES -Check for poor connections or loose terminals at the FTP sensor and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 34 If the PCM was substituted, go to step 1 NO -Go to step 36
36. Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ) If any other Pending or Confirmed DTCs were indicated in step 35 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 34 If the PCM was substituted, go to step 1 If the screen indicates NOT COMPLETED, keep idling until a result comes on

DTC P0453: FTP Sensor Circuit High Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Scheme 41

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Scheme 46

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Remove the fuel fill cap
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
6. Check the FTP SENSOR in the DATA LIST with the HDS Is about 7 3 kPa (2 16 in Hg, 55 mmHg), or 47 V or more indicated? YES -Go to step 10 NO -Go to step 7
7. Install the fuel fill cap
8. Start the engine
9. Monitor the OBD STATUS for DTC P0453 in the DTCs MENU with the HDS Does the screen indicate FAILED? YES -Go to step 10 NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the FTP sensor and the PCM If the screen indicates NOT COMPLETED, keep idling until a result comes on
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
11. Disconnect the FTP sensor 3P connector
12. Connect FTP sensor 3P connector terminals No 2 and No 3 with a jumper wire
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
14. Check the FTP SENSOR in the DATA LIST with the HDS Is about 7 3 kPa (2 16 in Hg, 55 mmHg), or 47 V or more indicated? YES -Go to step 15 NO -Go to step 26
15. Measure the voltage between FTP sensor 3P connector terminals No 1 and No 3 Is there about 5 V? YES -Go to step 21 NO -Go to step 16
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
17. Jump the SCS line with the HDS
18. Disconnect PCM connector A (49P)
19. Connect FTP sensor 3P connector terminal No 3 to body ground with a jumper wire
20. Check for continuity between PCM connector terminal A27 and body ground Is there continuity? YES -Go to step 34 NO -Repair open in the wire between the PCM (A27) and the FTP sensor, then go to step 28
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
22. Jump the SCS line with the HDS
23. Disconnect PCM connector A (49P)
24. Connect FTP sensor 3P connector terminal No 2 to body ground with a jumper wire
25. Check for continuity between PCM connector terminal A39 and body ground Is there continuity? YES -Go to step 34 NO -Repair open in the wire between the PCM (A39) and the FTP sensor, then go to step 28
26. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
27. Replace the FTP sensor, without SH-AWD system (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), with SH-AWD system (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
28. Reconnect all connectors
29. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
30. Reset the PCM with the HDS
31. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
32. Check for Pending or Confirmed DTCs with the HDS Is DTC P0453 indicated? YES -Check for poor connections or loose terminals at the FTP sensor and the PCM, then go to step 1 . NO -Go to step 33
33. Monitor the OBD STATUS for DTC P0453 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -Troubleshooting is complete If any other Pending or Confirmed DTCs were indicated in step 32 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor and the PCM, then go to step 1 If the screen indicates NOT COMPLETED, keep idling until a result comes on
34. Reconnect all connectors
35. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ) or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) )
36. Start the engine, and let it idle
37. Check for Pending or Confirmed DTCs with the HDS Is DTC P0453 indicated? YES -Check for poor connections or loose terminals at the FTP sensor and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 36 If the PCM was substituted, go to step 1 NO -Go to step 38
38. Monitor the OBD STATUS for DTC P0453 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ) If any other Pending or Confirmed DTCs were indicated in step 37 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 36 If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on

Note. The fuel system is designed to allow specified maximum vacuum and pressure conditions Do not deviate from the vacuum and pressure tests as indicated in these procedures Excessive pressure/vacuum would damage the EVAP components or cause eventual fuel tank failure

Special Tools Required

Vacuum pump/gauge, 0-30 in Hg, Snap-on YA4000A or equivalent, commercially available

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ) Fresh fuel has a higher volatility that will create greater pressure/vacuum The optimum condition for testing is less than a full tank of fresh fuel. If possible, to assist in leak detection, add 1 gallon of fresh fuel to the tank (as long as ii will not fill the tank), just before starting these procedures

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1. Check the fuel fill cap (the cap must say TIGHTEN TO CLICK) It should turn 1/4 turn after it's tight, then it clicks Is the correct fuel fill cap installed and properly tightened? YES -Go to step 2 NO -Replace or tighten the cap, then go to step 28
2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B) Verify that the fuel fill cap tether cord (C) is not caught under the cap Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is the tether cord caught under the cap? YES -Replace the fuel fill cap or the fuel fill pipe, then go to step 29 NO -Go to step 3
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
4. Clear the DTC with the HDS
5. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, or the EVAP canister vent shut valve, and the PCM NO -Go to step 6
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
7. Check for a poor connection or damage at the fuel tank vapor recirculation tube Is the tube OK? YES - With SH-AWD Go to step 8 Without SH-AWD Go to step 9 NO - Replace the fuel tank vapor recirculation tube, then go to step 29 If necessary, replace the fuel tank, with SH-AWD (see «WITH SH-AWD»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), without SH-AWD (see «FUEL TANK REPLACEMENT»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), then go to step 29
8. Remove the fuel tank (see «REMOVAL (WITH SH-AWD)»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system__removal-with-sh-awd) )
9. Disconnect the fuel tank vapor recirculation tube (A) and fresh air hose (B) from the EVAP canister (C), and plug the EVAP canister ports (D) With SH-AWD Without SH-AWD
10. Disconnect the vacuum hose (engine side) (A) from the EVAP canister purge valve (B) in the engine compartment, and connect the vacuum pump/gauge, 0-30 in Hg, to the purge valve as shown
11. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
12. Select EVAP PCS ON in the INSPECTION MENU with the HDS
13. Apply vacuum to the hose until the FTP reads 1 90 V (-0 59 in Hg,-15 1 mmHg) NOTE: Be careful not to exceed the specified vacuum If you do, the FTP sensor can be damaged
14. Select EVAP PCS OFF in the INSPECTION MENU with the HDS, then remove the vacuum pump from the purge valve
15. Monitor the FTP SENSOR in the DATA LIST for 1 minute with the HDS, and remove the vacuum pump from the purge valve Does the voltage increase more than 0 2V (0 1 in Hg, 0 5 mmHg)? YES -Go to step 16 NO -Go to step 21
16. Reconnect the vacuum hose (engine side) to the EVAP canister purge valve
17. Disconnect the vacuum hose (EVAP canister side) (A) from the EVAP canister purge valve (B) in the engine compartment, and connect the vacuum pump/gauge, 0-30 in Hg, to the vacuum hose as shown
18. Apply vacuum to the hose until the FTP reads 1 90 V (-0 59 in Hq,-15 1 mmHg) NOTE: Be careful not to exceed the specified vacuum If you exceed the vacuum, the FTP sensor can be damaged
19. Monitor the FTP SENSOR in the DATA LIST for 1 minute with the HDS Does the voltage increase more than 0 2V (0 1 in Hg, 0 5 mmHg)? YES -Go to step 20 NO -Replace the EVAP canister purge valve (see «EVAP CANISTER FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 29
20. Check for a loose or damaged EVAP canister purge line between the EVAP canister and the EVAP canister purge valve Is the line OK? YES -Replace these parts, then go to step 29 FTP sensor O-ring EVAP canister vent shut valve case and O-ring EVAP canister NO -Reconnect or repair the EVAP canister purge line, then go to step 29
21. Reconnect the fresh air hose (A) to the EVAP canister (B) With SH-AWD Without SH-AWD
22. Reconnect the vacuum hose (engine side) to the EVAP canister purge valve
23. Disconnect the vacuum hose (EVAP canister side) (A) from the EVAP canister purge valve (B) in the engine compartment, and connect the vacuum pump/gauge, 0-30 in Hg, to the purge valve as shown
24. Select EVAP CVS ON in the INSPECTION MENU with the HDS
25. Apply vacuum to the EVAP system until the FTP reads 1 90 V (-0 59 in Hg, -15 1 mmHg) NOTE: Be careful not to exceed the specified vacuum If you do, the FTP sensor can be damaged
26. Monitor the FTP SENSOR in the DATA LIST for 1 minute with the HDS Does the voltage increase more than 0 2V (0 1 in Hg, 2 5 mmHg)? YES -Replace the EVAP canister vent shut valve (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 29 NO -Go to step 27
27. Select EVAP CVS OFF in the INSPECTION MENU with the HDS
28. Check these parts for looseness or damage Fuel fill pipe Fuel vapor return pipe Are the parts OK? YES - With SH-AWD Check the fuel tank unit base gasket (see «REMOVAL (WITH SH-AWD)»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system__removal-with-sh-awd) ), the secondary fuel gauge sending unit base gasket (see «SECONDARY FUEL GAUGE SENDING UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system__secondary-fuel-gauge-sending-unit-removalinstallation) ), and check the fuel tank, then go to step 31 Without SH-AWD Check the fuel tank unit base gasket (see «FUEL TANK UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system__fuel-tank-unit-removal-and-installation) ), and check the fuel tank, then go to step 31 NO -Repair or replace the damaged parts, then go to step 29
29. Reconnect all hoses and connectors
30. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
31. Reset the PCM with the HDS
32. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
33. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Troubleshooting is complete NO -Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM, then go to step 1

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Scheme 55

Scheme 56

1. Check the fuel fill cap (the cap must say TIGHTEN TO CLICK) It should turn 1/4 turn after it's tight, then it clicks Is the correct fuel fill cap installed and properly tightened? YES -Go to step 2 NO -Replace or tighten the cap, then go to step 20
2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B) Verify that the fuel fill cap tether cord (C) is not caught under the cap Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is the tether cord caught under the cap? YES -Replace the fuel fill cap or the fuel fill pipe, then go to step 20 NO -Go to step 3
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
4. Clear the DTC with the HDS
5. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM NO -Go to step 6
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
7. Remove the EVAP canister vent shut valve from the EVAP canister, without SH-AWD system (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), with SH-AWD system (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
8. Connect the 2P connector to the EVAP canister vent shut valve
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
10. Select EVAP CVS ON in the INSPECTION MENU with the HDS
11. Check the EVAP canister vent shut valve (A) operation Does the valve operate? YES -Go to step 19 NO -Go to step 12
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
13. Replace the EVAP canister vent shut valve, without SH-AWD system (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), with SH-AWD system (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
15. Reset the PCM with the HDS
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
17. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Troubleshooting is complete NO -Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM, then go to step 1
18. Check the EVAP canister vent tub. Is there any damage or blockage? YES -Repair blockage or replace EVAP vent tube, then go to step 19 NO -Do the DTC P0455 Troubleshooting (see «DTC P0455»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
19. Reinstall the EVAP canister vent shut valve
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
21. Reset the PCM with the HDS
22. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
23. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Troubleshooting is complete NO -Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM, then go to step 1

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM NO -Go to step 4 NOTE: If the test could not be completed because of another DTC, do the troubleshooting for that DTC, then go to step 4
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
5. Replace the EVAP canister purge valve (see «EVAP CANISTER FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
7. Reset the PCM with the HDS
8. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
9. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Troubleshooting is complete NO -Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM, then go to step 1

Special Tools Required

1. Vacuum pump/gauge, 0-30 in Hg, Snap-on YA4000A or equivalent, commercially available
2. Vacuum/pressure gauge, 0-4 in Hg 07JAZ-001000B

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Select EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the EVAP canister purge valve, the FTP sensor, and the PCM NO -Go to step 4
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
5. Check for a poor connection, a blockage, or damage at the EVAP canister purge line between the throttle body and the EVAP canister Is the line OK? YES -Go to step 6 NO -Reconnect or repair the EVAP canister purge line, then go to step 24
6. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B)
7. Disconnect the vacuum hose (A) from the purge line (at the EVAP canister side), then connect a T-fitting (B) from the vacuum gauge, and connect the vacuum pump/gauge, 0-30 in Hg, to the hose as shown
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
9. Apply about 2 kPa (0 6 in Hg, 15 mmHg) of vacuum to the hose
10. Select EVAP PCS ON in the INSPECTION MENU with the HDS Does the vacuum release immediately? YES -Go to step 15 NO -Go to step 11
11. Select EVAP PCS OFF in the INSPECTION MENU with the HDS
12. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) Connect a T-fitting (C) from the vacuum gauge, and connect the vacuum pump/gauge, 0-30 in Hg, to the EVAP canister purge valve as shown
13. Apply about 2 kPa (0 6 in Hg, 15 mmHg) of vacuum to the purge valve
14. Select EVAP PCS ON in the INSPECTION MENU with the HDS Does the vacuum release immediately? YES -Check for a blockage in the vacuum hose between the EVAP canister purge valve and the EVAP canister, then go to step 24 NO -Replace the EVAP canister purge valve (see «EVAP CANISTER FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 24
15. Connect the vacuum pump/gauge, 0-30 in Hg, to the vacuum hose (A) as shown
16. Start the engine, and let it idle Is there vacuum? YES -Go to step 17 NO -Check for a blockage in the vacuum hose between the EVAP canister purge valve and the intake manifold, then go to step 24
17. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
18. Remove the FTP sensor with its connector connected (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
19. Connect a T-fitting (A) from the vacuum pump/gauge, 0-30 in Hg, and connect the vacuum pump to the FTP sensor (B) as shown
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
21. Check and record the FTP SENSOR reading in the DATA LIST with the HDS
22. Slowly apply about 1 3 kPa (0 4 in Hg, 10 mmHg) of vacuum to the hose
23. Check the FTP SENSOR in the DATA LIST with the HDS Does the value change? YES -Check for debris or a blockage at the EVAP canister port, then go to step 24 NO -Replace the FTP sensor (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 24
24. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
25. Reset the PCM with the HDS
26. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
27. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Troubleshooting is complete NO -Check for poor connections or loose terminals at the EVAP canister purge valve, the FTP sensor, and the PCM, then go to step 1

Special Tools Required

1. Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially available
2. Vacuum/pressure gauge, 0-4 in Hg 07JAZ-001000B

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Scheme 66

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Select EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the EVAP canister purge valve, the FTP sensor, and the PCM NO -Go to step 4
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
5. Check for a poor connection, a blockage, or damage at the EVAP canister purge line between the throttle body and the EVAP canister Is the line OK? YES -Go to step 6 NO -Reconnect or repair the EVAP canister purge line, then go to step 25
6. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B)
7. Remove the trunk front trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) ), then remove the access panel from the floor (see step 2 )
8. Disconnect the vacuum hose (A) from the purge line (at the EVAP canister side), then connect a T-fitting (B) from the vacuum gauge, and connect the vacuum pump/gauge, 0-30 in Hg, to the hose as shown
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
10. Apply about 2 kPa (0 6 in Hg, 15 mmHg) of vacuum to the hose
11. Select EVAP PCS ON in the INSPECTION MENU with the HDS Does the vacuum release immediately? YES -Go to step 16 NO -Go to step 12
12. Select EVAP PCS OFF in the INSPECTION MENU with the HDS
13. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) Connect the T-fitting (C) from the vacuum gauge, and connect the vacuum pump/gauge, 0-30 in Hg, to the EVAP canister purge valve as shown
14. Apply about 2 kPa (0 6 in Hg, 15 mmHg) of vacuum to the purge valve
15. Select EVAP PCS ON in the INSPECTION MENU with the HDS Does the vacuum release immediately? YES -Check for a blockage in the vacuum hose between the EVAP canister purge valve and the EVAP canister, then go to step 25 NO -Replace the EVAP canister purge valve (see «EVAP CANISTER FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 25
16. Connect the vacuum pump/gauge, 0-30 in Hg, to the vacuum hose (A) as shown
17. Start the engine, and let it idle Is there vacuum? YES -Go to step 13 NO -Check for a blockage in the vacuum hose between the EVAP canister purge valve and the intake manifold, then go to step 25
18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
19. Remove the FTP sensor with its connector connected (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
20. Connect a T-fitting (A) from the vacuum pump/gauge, 0-30 in Hg, and connect the vacuum pump to the FTP sensor (B) as shown
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
22. Check and record the FTP SENSOR reading in the DATA LIST with the HDS
23. Slowly apply about 1 3 kPa (0 4 in Hg, 10 mmHg) of vacuum to the hose
24. Check the FTP SENSOR in the DATA LIST with the HDS Does the value change? YES -Check for debris or a blockage at the EVAP canister port, then go to step 25 NO -Replace the FTP sensor (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 25
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
26. Reset the PCM with the HDS
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
28. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS Is the result OK? YES -Troubleshooting is complete NO -Check for poor connections or loose terminals at the EVAP canister purge valve, the FTP sensor, and the PCM, then go to step 1

DTC P0498: EVAP Canister Vent Shut Valve Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Scheme 67

Scheme 68

Scheme 69

Scheme 70

Scheme 71

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Check for Pending or Confirmed DTCs with the HDS Is DTC P0498 indicated? YES -Go to step 6 NO -Go to step 4
4. Select EVAP CVS ON in the INSPECTION MENU with the HDS
5. Check for Pending or Confirmed DTCs with the HDS Is DTC P0498 indicated? YES -Go to step 6 NO -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
7. Disconnect the EVAP canister vent shut valve 2P connector
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
9. Measure the voltage between EVAP canister vent shut valve 2P connector terminal No 2 and body ground Is there battery voltage? YES -Go to step 10 NO -Repair open in the wire between the EVAP canister vent shut valve and the PGM-FI subrelay, then go to step 18
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
11. At the valve side, measure the resistance between EVAP canister vent shut valve 2P connector terminals No 1 and No 2 Is there about 25-30 ohms at room temperature? YES -Go to step 12 NO -Go to step 17
12. Jump the SCS line with the HDS
13. Disconnect PCM connector A (49P)
14. Check for continuity between PCM connector terminal A22 and body ground Is there continuity? YES -Repair short in the wire between the EVAP canister vent shut valve and the PCM (A22), then go to step 18 NO -Go to step 15
15. Connect EVAP canister vent shut valve 2P connector terminal No 1 to body ground with a jumper wire
16. Check for continuity between PCM connector terminal A22 and body ground. Is there continuity? YES -Go to step 25 NO -Repair open in the wire between the EVAP canister vent shut valve and the PCM (A22), then go to step 18
17. Replace the EVAP canister vent shut valve, without SH-AWD system (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), with SH-AWD system (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
18. Reconnect all connectors
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
20. Reset the PCM with the HDS
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
22. Select EVAP CVS ON in the INSPECTION MENU with the HDS
23. Check for Pending or Confirmed DTCs with the HDS Is DTC P0498 indicated? YES -Check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM, then go to step 1 NO -Go to step 24
24. Monitor the OBD STATUS for DTC P0498 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -Troubleshooting is complete If any other Pending or Confirmed DTCs were indicated in step 23 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM, then go to step 1 If the screen indicates NOT COMPLETED, go to step 22
25. Reconnect all connectors
26. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ) or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) )
27. Select EVAP CVS ON in the INSPECTION MENU with the HDS
28. Check for Pending or Confirmed DTCs with the HDS Is DTC P0498 indicated? YES -Check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 27 If the PCM was substituted, go to step 1 NO -Go to step 29
29. Monitor the OBD STATUS for DTC P0498 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ) If any other Pending or Confirmed DTCs were indicated in step 28 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 27 If the PCM was substituted, go to step 1 If the screen indicates NOT COMPLETED, go to step 27

DTC P0499: EVAP Canister Vent Shut Valve Circuit High Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Select EVAP CVS ON in the INSPECTION MENU with the HDS
4. Check for Pending or Confirmed DTCs with the HDS Is DTC P0499 indicated? YES -Go to step 5 NO -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM
5. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ) or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) )
6. Select EVAP CVS ON in the INSPECTION MENU with the HDS
7. Check for Pending or Confirmed DTCs with the HDS Is DTC P0499 indicated? YES -Check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 6 If the PCM was substituted, go to step 1 NO -Go to step 8
8. Monitor the OBD STATUS for DTC P0499 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -If the PCM was updated, troubleshooting is complete If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ) If any other Pending or Confirmed DTCs were indicated in step 7 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 6 If the PCM was substituted, go to step 1 If the screen indicates NOT COMPLETED, go to step 6

DTC P1454: FTP Sensor Circuit Range/Performance Problem; DTC P2422: EVAP Canister Vent Shut Valve Stuck Closed Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Remove the fuel fill cap, and wait 1 minute
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
6. Check the FTP SENSOR in the DATA LIST with the HDS Is it between - 0 67 and 0 67 kPa (-0 2 and 02 in Hg, - 5 and 5 mmHg), or 2 4 and 2 6 V? YES -Go to step 7 NO -Go to step 18
7. Install the fuel fill cap
8. Clear the DTC with the HDS
9. Start the engine Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in 4th) until the radiator fan comes on, then let it idle
10. Monitor the OBD STATUS for DTC P1454 in the DTCs MENU with the HDS Does the screen indicate FAILED? YES -Go to step 11 NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM Also check for a blockage in the vent hoses and the drain joint If the screen indicates NOT COMPLETED, keep idling until a result comes on
11. Clear the DTC with the HDS
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
13. Remove the EVAP canister vent shut valve from the EVAP canister (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
14. Connect the 2P connector to the EVAP canister vent shut valve
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
16. Select EVAP CVS ON in the INSPECTION MENU with the HDS
17. Check the EVAP canister vent shut valve (A) operation Does the valve operate? YES -Check for a blockage in the EVAP canister, vent hoses, and the dram joint, then install the EVAP canister vent shut valve, and go to step 25 NO -Replace the EVAP canister vent shut valve (see «EVAP CANISTER VENT SHUT VALVE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 25
18. With SH-AWD Remove the trunk front trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) ), then remove the access panel from the floor (see step 2 )
19. Disconnect the air tube (A) from the FTP sensor (B) Without SH-AWD With SH-AWD
20. Check the FTP SENSOR in the DATA LIST with the HDS Is it between -0 67 and 0 67 kPa (-02 and 0 2 in Hg, - 5 and 5 mmHg), or 2 4 and 2 6 V? YES -Check for a blockage in the FTP sensor air tube or vent clear the blockage and reattach the air tube or vent, then go to step 25 NO -Go to step 21
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
22. Remove the FTP sensor (A) from the EVAP canister with its connector connected (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ) Without SH-AWD With SH-AWD
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
24. Check the FTP SENSOR in the DATA LIST with the HDS Is it between - 0 67 kPa and 0 67 kPa (-0 2 and 0 2 in Hg,-5 and 5 mmHg), or 2 4 and 2 6 V? YES -Check for debris or clogging at the EVAP canister and the FTP sensor port, then go to step 25 NO -Replace the FTP sensor (see «FTP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 25
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
26. Reset the PCM with the HDS
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
28. Check for Pending or Confirmed DTCs with the HDS Is DTC P1454 and/or P2422 indicated? YES -Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM, then go to step 1 NO -Go to step 29
29. Monitor the OBD STATUS for DTC P1454 in the DTCs MENU with the HDS Does the screen indicate PASSED? YES -Troubleshooting is complete If any other Pending or Confirmed DTCs were indicated in step 28 , go to the indicated DTC's troubleshooting NO -If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and the PCM, then 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 GENERAL TROUBLESHOOTING INFORMATION ) If DTC P145C is indicated alone, do the troubleshooting for DTC P0496 and P0497 using freeze data for P145C If DTC P0497 and P145C stored at the same time, check for a poor connection, a blockage, or damage at the EVAP canister purge line between the EVAP canister purge valve and the EVAP canister, or a stuck closed EVAP canister purge valve If any of DTCs listed below are indicated at the same time as DTC P145C, troubleshoot those DTCs first, then recheck for P145C

P0496, P0497 EVAP system purge flow

Fuel Cap Warning Message System Troubleshooting

Special Tools Required

1. Vacuum pump/gauge, 0-30 in Hg, Snap-on YA4000A or equivalent, commercially available
2. Vacuum/pressure gauge, 0-4 in Hg 07JAZ-001000B

Do this procedure if the fuel cap warning message comes on frequently, or if the message does not go off after the fuel fill cap is tightened and the vehicle is driven several days

Scheme 77

Scheme 78

1. Check the fuel fill cap (the cap must say TIGHTEN TO CLICK) It should turn 1/4 after it's tight, then it clicks Is the correct fuel fill cap installed and properly tightened? YES -Go to step 2 NO -Replace or tighten the cap, then go to step 13
2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B) Verify that the fuel fill cap tether cord (C) is not caught under the cap Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is the tether cord caught under the cap? YES -Replace the fuel fill cap or the fuel fill pipe, then go to step 13 NO -Go to step 3
3. Reinstall and tighten the fuel fill cap
4. Clear the DTC with the HDS
5. Start the engine Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in 4th) until the radiator fan comes on, then let it idle for 1 minute
6. Test drive at 45 mph (72 km/h) for 1 minute or more Does the fuel fill cap warning message come on? YES -Go to step 7 NO -Intermittent failure, the system is OK at this time
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
8. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) in the engine compartment, then connect a T-fitting (C) from the vacuum gauge, and connect the vacuum pump/gauge 0-30 in Hg, to the EVAP canister purge valve as shown
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
10. Apply about 2 kPa (0 6 in Hg, 15 mmHg) of vacuum to the hose
11. Select the EVAP PCS ON in the INSPECTION MENU with the HDS Does the vacuum release immediately? YES -Check for a blockage in the vacuum hose/line between the EVAP canister purge valve and the EVAP canister, then go to step 12 NO -Replace the EVAP canister purge valve (see «EVAP CANISTER FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) ), then go to step 12
12. Install the parts in the reverse order of removal
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
14. Reset the PCM with the HDS
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
16. Test-drive at 45 mph (72 km/h) for 1 minute or more Does the fuel cap warning message come on? YES -Go to step 1 and recheck NO -Troubleshooting is complete

Scheme 79

Scheme 80

Scheme 81

Scheme 82

Scheme 83

1. Raise the vehicle on a lift
2. Remove the wheel sensor harness clamps (A)
3. Support the rear subframe with a transmission jack and a wooden block as shown
4. Remove the rear subframe mounting bolts (B) and (C)
5. Lower the transmission jack and the rear subframe about 50 mm NOTE: Be careful not to damage the connecting parts
6. Remove the bolt (A), and disconnect the hoses (B), the EVAP canister vent shut valve 2P connector (C), and the FTP sensor 3P connector (D)
7. Remove the bolts (E), then remove the EVAP canister assembly (F)
8. Remove the EVAP canister (A) from the EVAP canister bracket (B)
9. Remove the EVAP canister vent shut valve (A) and the FTP sensor (B) from the canister (C)
10. Reassemble the EVAP canister with new O-rings (D) and a new retainer (E), then install the EVAP canister bracket NOTE: Do not coat the O-rings with oil
11. Install the EVAP canister assembly to the body NOTE: Attach the bracket arm (A) to the body as shown
12. Install the parts in the reverse order of removal Use new bolts when you install the rear subframe
13. Check the wheel alignment (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) )

Scheme 84

Scheme 85

Scheme 86

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential) )
2. Remove the fuel tank (see «WITH SH-AWD»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) )
3. Remove the EVAP canister filter (see «EVAP CANISTER FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#evap-system) )
4. Disconnect the quick-connect fitting (A), the hose (B), the FTP sensor 3P connector (C), and the EVAP canister vent shut valve 2P connector (D)
5. Remove the bolts (E) and the EVAP canister assembly (F)
6. Remove the EVAP canister (A) from the bracket (B)
7. Remove the EVAP canister vent shut valve (A) and the FTP sensor (B) from the EVAP canister (C)
8. Reassemble the EVAP canister with new O-rings (D) and a new retainer (E), then install the EVAP canister bracket NOTE: Do not coat the O-rings with oil
9. Install the parts in the reverse order of removal

Note. The new fuel vapor hose has a ring pull (A) at the connector (B) When you connect the connector and confirm that the connection is secure, remove the ring pull by pulling it down

Scheme 87

Scheme 88

Scheme 89

1. Remove the bolt (A), and disconnect the EVAP canister vent shut valve 2P connector (B), the FTP sensor 3P connector (C), and the hoses (D)
2. Remove the bolts (E), and move the EVAP canister assembly (F) to the rear
3. Remove the FTP sensor (A)
4. Install the parts in the reverse order of removal with a new O-ring (B) and a new retainer (C)

Scheme 90

Scheme 91

1. Remove the trunk front trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) )
2. Remove the access panel (A) from the floor
3. Disconnect the hose (A) and the FTP sensor 3P connector (B)
4. Remove the FTP sensor (C)
5. Install the parts in the reverse order of removal with a new O-ring (D) and a new retainer (E)

Scheme 92

1. Disconnect the EVAP canister vent shut valve 2P connector (A)
2. Remove the cap (B)
3. Remove the EVAP canister vent shut valve (C)
4. Install the parts in the reverse order of removal with new O-rings (D) and a new cap

Note. Do not coat the O-rings with oil

Scheme 93

Scheme 94

1. Remove the trunk front trim panel (see «TRIM REMOVAL/INSTALLATION - TRUNK AREA»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-trunk-area) )
2. Remove the access panel (A) from the floor
3. Disconnect the EVAP canister vent shut valve 2P connector (A)
4. Remove the cap (B)
5. Remove the EVAP canister vent shut valve (C)
6. Install the parts in the reverse order of removal with new O-rings (D) and a new cap

Scheme 95

1. Remove the rear differential (see «REAR DIFFERENTIAL REMOVAL»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential) )
2. Disconnect the hoses (A)
3. Remove the EVAP canister filter (B)
4. Install the parts in the reverse order of removal

Scheme 96

Scheme 97

1. Disconnect the hoses (A) and the EVAP canister purge valve 2P connector (B)
2. Remove the EVAP canister purge valve assembly (C)
3. Remove the EVAP canister purge valve (A) from the bracket(B)
4. Install the parts in the reverse order of removal

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• PCM IDLE LEARN PROCEDURE
• ECM/PCM UPDATE
• SUBSTITUTING THE ECM/PCM
• ECM/PCM REPLACEMENT
• WITH SH-AWD
• REMOVAL (WITH SH-AWD)
• SECONDARY FUEL GAUGE SENDING UNIT REMOVAL/INSTALLATION
• FUEL TANK UNIT REMOVAL AND INSTALLATION
• TRIM REMOVAL/INSTALLATION - TRUNK AREA
• WHEEL ALIGNMENT
• REAR DIFFERENTIAL REMOVAL
• EVAP CANISTER FILTER REPLACEMENT