Having problems with your 1998 Honda Odyssey ?

1999 Honda Odessey P1259 VTEC System Circuit Fault (Bank 1)

\015 Recently replaced alternator , not sure if problem is related. \302\240Tripped this P1259 and P1456 Evap Control System Leak detected (Fuel Tank) \302\240Vehicle now misses out when speeding up to pass or accelerate. \302\240Any help in diagnosing the problem would be appreciated. \302\240Semper Fi, John\015 Posted / edited by AnonymousUser on : 25-05-2020

Answers :

I would first try and reset the Powertrain Control Module since you replaced the alternator. This will clear all the codes and turn off the check engine light. To do this, pull the No. 13 "clock backup" fuse from the passenger kick panel fuse box for 10 seconds then replace.

Now, you should also do the Honda "idle learn procedure". This lets the computer calculate what a no load idle condition is so it can adjust idle speed when the engine or alternator is put under various loads. To do this, make sure all electrical items are turned off. Start the engine and hold it at 3,000 rpm in park or neutral until the radiator fan comes on or until normal operating temp is reached (about 4 minutes). Now let the engine idle for a minimum of 5 minutes with no loads. If the radiator fan comes on during the 5 minutes, the amount of time it runs must be added to the 5 minute period--the goal being a period of at least 5 minutes without any loads on the engine or alternator.

Also check the vacuum line to the evap solenoid. It is on the top of the engine near the intake throttle body.
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