DTC P0497

DTC P0497  : EVAP System Low Purge Flow Detected

Special Tools Required 

Vacuum/Pressure Gauge, 0-4 inHg 07JAZ-001000B 

Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available 

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode.

   -5. Select the EVAP TEST in the Function Test Menu, then select the EVAP Purge Flow Check Test with the HDS.

   EVAP TEST

   Is the result OK?

   YES 

   If the test result is PASSED, 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 leak detection module, and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.

   NO 

   The failure is duplicated. Go to step 2

2. EVAP canister purge valve check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Remove the EVAP canister purge valve with its connector and vacuum hose connected.

   -3. Disconnect the vacuum hoses (A) from the EVAP canister purge valve (B) in the engine compartment, then connect a vacuum pump/gauge, 0-30 inHg, to the EVAP canister purge valve as shown.

   Courtesy of HONDA, U.S.A., INC.

   -4. Turn the vehicle to the ON mode.

   -5. Slowly apply a vacuum to the hose.

   -6. Select the EVAP TEST in the Function Test Menu, then select the Single Solenoid Test with the HDS.

   EVAP TEST

   Select the Purge Control Solenoid (PCS) in the Single Solenoid Test with the HDS.

   Does it hold a vacuum?

   YES 

   Replace the EVAP canister purge valve .

   NO 

   Go to step 3.

3. Determine possible failure area (Purge hose, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the purge hose (A) from the EVAP canister purge valve (B), then connect the vacuum pump/gauge, 0-30 inHg, to the hose as shown.

   Courtesy of HONDA, U.S.A., INC.

   -3. Turn the vehicle to the ON mode.

   -4. Check and record the EVAP leak detection module pressure sensor reading in the DATA LIST with the HDS.

   Signal	Current conditions
   	Values	Unit
   Absolute Pressure of ELCM Pressure Sensor

   Data List

   -5. Slowly apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the hose.

   NOTE: To avoid damaging the EVAP leak detection module pressure sensor, do not apply more than 2 kPa (0.6 inHg, 15 mmHg) of vacuum.

   Does it hold a vacuum?

   YES 

   Go to step 4.

   NO 

   Remove the blockage in the hose or replace the hose between the EVAP canister purge valve and the throttle body.

4. Determine possible failure area (EVAP leak detection module, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Remove the EVAP leak detection module from the EVAP canister.

   -3. Connect the vacuum pump/gauge, 0-30 inHg, to the hose as shown.

   Courtesy of HONDA, U.S.A., INC.

   -4. Slowly apply a vacuum to the hose.

   Does it hold a vacuum?

   YES 

   Go to step 5.

   NO 

   Replace the EVAP leak detection module .

5. Determine possible failure area (EVAP canister, purge hose)

   -1. Remove the purge hose (A) from the EVAP canister (B).

   Courtesy of HONDA, U.S.A., INC.

   -2. Connect the vacuum pump/gauge, 0-30 inHg, to the hose as shown.

   Courtesy of HONDA, U.S.A., INC.

   -3. Slowly apply a vacuum to the hose.

   Does it hold a vacuum?

   YES 

   Check for a blockage in the purge line between the EVAP canister purge valve and the EVAP canister.

   NO 

   Replace the EVAP canister .