Powertrain - Evap System Leak, DTC P1457

Diagnosing DTC P1457? Use TID Info to Pinpoint Problem

NOTE:
This article applies to '97-03 CLs, '98-01 Integras, 01-02 MDXs, '02-03 RSXs, '96-04 3.2RLs, and '97-03 3.2TLs. Newer model Acuras ('03-06 MDXs, '05-06 RLs, '04-06 RSXs, '04-06 TLs, and '04-06 TSXs) no longer use DTC P1456 or P1457. For details on this, see "Seven New DTCs Replace DTCs P1456 and P1457" in the January '06 issue of ServiceNews.

Troubleshooting DTC P1457 [EVAP system leakage (EVAP canister system)] and need to narrow it down to a specific problem? The OBD self-test info pulled from the ECM/PCM can help make short work of it (see S/B 02-005, EVAP System Function Testing and Diagnostics With the PGM Tester). It shows you which of the recently run OBD self-tests passed or failed.

NOTE:
This S/B has you pulling test info with the PGM Tester, but doing it with the HDS is very similar. Until we can update this S/B to cover the HDS, just consider it useful guidance for now. Here are the OBD self-tests related to DTC P1457 listed by their test ID (TID), along with an explanation of what could cause each test to fail:

^ TID$2D: This test fails because of a large leak, a solenoid that won't work, or a loose connection that keeps a solenoid from working.

^ TID$2E: This test fails because of a small leak. In most cases, it isn't because of an electrical problem but rather a component that won't hold vacuum during the test. Another reason is crossed hoses at the two-way valve.

^ TID$2F: This test fails because of a restriction in the EVAP canister vent. A canister vent shut valve that's stuck closed could be the reason, but a more likely reason is a yellow sac spider's nest in the three-way valve or drain joint. For details on this, see "Got DTC P2422? Check for an EVAP System Vent Blockage" in the March '06 issue of ServiceNews.

^ TID$29: This test fails because the purge control solenoid valve is stuck open or a short to ground in the control wire is causing the system to purge when it shouldn't. On rare occasions, a restricted EVAP canister vent can cause this test to fail.

^ TID$3E: This test fails because of a very small leak. Like TID$2F, this test usually fails because of a component that won't hold vacuum and not because of an electrical problem.