P1450
DTC P1450: Two Way Valve Bypass Valve Control Circuit Low Voltage1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Do the BPS CLOSE in the INSPECTION MENU with the HDS.
4. Wait 5 seconds.
5. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1450 indicated?
YES - Go to step 8.
NO - Go to step 6.
6. Do the EVAP BPS ON in the INSPECTION MENU with the HDS.
7. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1450 indicated?
YES - Go to step 8.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EVAP bypass solenoid valve and the PCM.
8. Turn the ignition switch OFF, then disconnect the EVAP bypass solenoid valve 2P connector.
9. At the EVAP bypass solenoid valve side, measure resistance between 2P connector terminals No.1 and No.2.
Is there about 30 - 34 Ohms (at room temperature)?
YES - Go to step 10.
NO - Go to step 17.
10. Measure voltage between EVAP bypass solenoid 2P connector terminal No.1 and body ground.
Is there battery voltage?
YES - Go to step 11.
NO - Repair open in the wire between EVAP bypass solenoid valve and A/F sensor relay, then go to step 19.
11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector B (56P).
14. Check for continuity between PCM connector B7 terminal and body ground.
Is there continuity?
YES - Repair short in the wire between the EVAP bypass solenoid valve and the PCM, then go to step 18.
NO - Go to step 23.
15. Connect EVAP bypass solenoid valve 2P connector terminal No.2 to body ground with a jumper wire.
16. Check for continuity between PCM connector terminal B7 and body ground.
Is there continuity?
YES - Go to step 23.
NO - Repair open in the wire between the PCM and EVAP bypass solenoid valve, then go to step 17.
17. Replace the EVAP bypass solenoid valve.
18. Reconnect PCM connector B (56P) and the EVAP bypass solenoid 2P connector
19. Turn the ignition switch ON (II).
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure.
22. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1450 is indicated, check for poor connections or loose terminals at the EVAP bypass solenoid valve and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Go to step 25.
23. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
24. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1450 is indicated, check for poor connections or loose terminals at the EVAP bypass solenoid valve and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.
25. Monitor the OBD STATUS for DTC P1450 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 EVAP bypass solenoid valve and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 8. and recheck.