P1259 VTEC System Malfunction
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Rep Power: 291 P1259 VTEC System Malfunction
Does anybody know how to debug my problem. OBDII scanner is throwing the code P1259 which tanslates to VTEC system malfunction.
My car shakes at idle....could I be misfiring or is it a bad solenoid?
My plugs look good and are correctly gapped.
Any ideas from you honda tech gurus.
Or could you let me know what to fix to get rid of VTEC system malfunction...I deleted the code and have reset the ECU but it made no difference...engine still shakes at idle up to about 1,100 rpms.
The shaking is getting worse.
I know the code has to do with the
Rear VTEC Pressure Switch
VTEC System Malfunction, Rear Bank (Bank 1)
My car shakes at idle....could I be misfiring or is it a bad solenoid?
My plugs look good and are correctly gapped.
Any ideas from you honda tech gurus.
Or could you let me know what to fix to get rid of VTEC system malfunction...I deleted the code and have reset the ECU but it made no difference...engine still shakes at idle up to about 1,100 rpms.
The shaking is getting worse.
I know the code has to do with the
Rear VTEC Pressure Switch
VTEC System Malfunction, Rear Bank (Bank 1)
Last edited by kjgracing; 11-05-2004 at 01:52 AM.
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Rep Power: 0 i have that same problem. does your vtec work cuse my don't at all well it did for a while but t stopped working i can't go past 4k rpm i should be taking it to the dealership to fix it they said warranty maycover it depeding what it is. i asked if he had any ideas what i could be he said it could be vtec solenoid, ecu, or something else he said it couldn't be the oil pressure cause they don't have that problem here amarillo,tx
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Rep Power: 356 I had that problem pop up a few weeks ago, went to the dealership and they tested the VTec system... every thing came out normal. they offered to either replace the parts ($130 for parts) or to just reset the CEL and see if it comes back. I opted for the reset. and its only happend once since. So... I dont konw
BTW, the way it pops up on my car is that it will light the CEL and then the car wont rev past 3700 RPMs (Safe Mode). if i turn the car off for about 20 min, the next time I drive the car the CEL will be on, but the car will rev past 3,700 RPMs. If I turn off the car one more time and let it sit.... Either the CEL will be off, or it will turn its self off after being driven for a while. Wierd Eh?
BTW, the way it pops up on my car is that it will light the CEL and then the car wont rev past 3700 RPMs (Safe Mode). if i turn the car off for about 20 min, the next time I drive the car the CEL will be on, but the car will rev past 3,700 RPMs. If I turn off the car one more time and let it sit.... Either the CEL will be off, or it will turn its self off after being driven for a while. Wierd Eh?
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Rep Power: 291 welll the oil is fine. It does not shut off vtec completely...I have the problem with asnd without the venom vcn 400 turned on. Also my 1/4 lie times have slipped abot 61oths!!!
now I hear a weird nock from the drivers side engine if I let off @ 3K rpms.. nside motor mount maybe?
now I hear a weird nock from the drivers side engine if I let off @ 3K rpms.. nside motor mount maybe?
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Rep Power: 291 I think that it could be misfiring. One of the coils looks a little rusty so I cleaned it and applied dielectric grease to it...it runs a bit better and I found out the nocking noise is caused from the driver side motor mount...the rubber buching has come it half and is being pushed out.
A DMM shows that the wiring of the VCN 400 is fine. I did the DIY VTEC light and it comes on when I drive hard. Also hooked up the LED for the VCN 400 and it shows that it comes on correctly at full throttle.
I am tempted to just fix the motor mount now and trade in my vic for the new Mustang....I can't decide...either Saleen, GT v8 with a supercharger later, or wait till Feb for the Roush Stage 3 or dec 2005 for cobra!! UGH!! tooo many decisions!
A DMM shows that the wiring of the VCN 400 is fine. I did the DIY VTEC light and it comes on when I drive hard. Also hooked up the LED for the VCN 400 and it shows that it comes on correctly at full throttle.
I am tempted to just fix the motor mount now and trade in my vic for the new Mustang....I can't decide...either Saleen, GT v8 with a supercharger later, or wait till Feb for the Roush Stage 3 or dec 2005 for cobra!! UGH!! tooo many decisions!
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Rep Power: 428 you still havent fixed this problem after 4 weeks? If you want Pm me and I can go through my service manual and look up the trouble code and give you some steps on what to test and see what the problem is
#14
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Rep Power: 318 Special Tools Required
-Pressure Gauge Adaptor 07NAJ-P07010A
-A/T Low Pressure Gauge w/panel 07406-0070300
-A/T Pressure Hose 07406-0020201
-A/T Pressure Hose 2,210 mm 07MAJ-PY4011A
-A/T Pressure Adaptor 07MAJ-PY40120
-Oil Pressure Hose 07ZAJ-S5AA200
Step 1) Reset the ECM/PCM
to do this you need to pull a fuse under the hood. Its the No. 6 ECU 15A
pull this fuse for 15 seconds and then reinsert it
Step 2) Check the oil level, and refill is necessary
Step 3) Start the engine, put the car in park if you have an auto, neutral if you have a 5-speed. Hold the RPM's at 3000 RPM until the radiator fan comes on, don't turn off the car just yet.
Step 4) Time to go for a drive, accerlate in first gear to an engine speed over 4000 rpm. Hold the engine speed for at least 2 seconds. If DTC P1259 is not repeated during the first test drive the try this test 2 more times.
Is DTC P1259 indicated?
YES - Go to Step 5
NO - Intermittent failure, system is OK at this time, Check for poor connections or loose terminals at the VTEC solenoid valve, at the VTEC pressure switch, and the ECM/PCM
Step 5) Turn the ignition off
Step 6) Remove the resonator, basically your stock intake is 3 parts, the part right above the throttle body, we'll call this piece A. The middle part that runs from piece A and that extension pipe over by the battery. This middle piece is the piece you want to remove.
Note, im guessing that if you have an aftermarket intake your going to need to put your stock intake back on.
Step 7) Disconnect the VTEC oil pressure switch 2p connector
The rest of the steps will follow shortly
-Pressure Gauge Adaptor 07NAJ-P07010A
-A/T Low Pressure Gauge w/panel 07406-0070300
-A/T Pressure Hose 07406-0020201
-A/T Pressure Hose 2,210 mm 07MAJ-PY4011A
-A/T Pressure Adaptor 07MAJ-PY40120
-Oil Pressure Hose 07ZAJ-S5AA200
Step 1) Reset the ECM/PCM
to do this you need to pull a fuse under the hood. Its the No. 6 ECU 15A
pull this fuse for 15 seconds and then reinsert it
Step 2) Check the oil level, and refill is necessary
Step 3) Start the engine, put the car in park if you have an auto, neutral if you have a 5-speed. Hold the RPM's at 3000 RPM until the radiator fan comes on, don't turn off the car just yet.
Step 4) Time to go for a drive, accerlate in first gear to an engine speed over 4000 rpm. Hold the engine speed for at least 2 seconds. If DTC P1259 is not repeated during the first test drive the try this test 2 more times.
Is DTC P1259 indicated?
YES - Go to Step 5
NO - Intermittent failure, system is OK at this time, Check for poor connections or loose terminals at the VTEC solenoid valve, at the VTEC pressure switch, and the ECM/PCM
Step 5) Turn the ignition off
Step 6) Remove the resonator, basically your stock intake is 3 parts, the part right above the throttle body, we'll call this piece A. The middle part that runs from piece A and that extension pipe over by the battery. This middle piece is the piece you want to remove.
Note, im guessing that if you have an aftermarket intake your going to need to put your stock intake back on.
Step 7) Disconnect the VTEC oil pressure switch 2p connector
The rest of the steps will follow shortly
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Rep Power: 318 Step 8) Check for continuity between the VTEC oil pressure switch p2 connector terminals No 1 and No 2
Is there continunity?
YES - Go to Step 9
NO - Replace the VTEC oil pressure switch
Step 9) Turn the ignition switch to ON (II)
Step 10) Measure the voltage between VTEC oil pressure seitch 2p connector 1 and body ground.
Is there battary voltage
YES - Go to Step 15
NO - Got to Step 11
Step 11) Measure the voltage between the ECM/PCM terminal B9 and body ground
Is there battery voltage?
YES - Repair the open wire between the VTEC oil pressure switch and the ECM/PCM (B9)
NO - Go to Step 12
Step 12) Turn the ignition switch off (II)
Step 13) Disconnect the ECM/PCM connector B (24P)
Step 14) Check the continuity between ECM/PCM connector terminal B9 and body ground.
Is there continuity?
YES - Repair the short in the wire between the VTEC oil pressure switch and the ECM/PCM (B9)
NO - Update the ECM/PCM software if it does not have the latest software, or substitute a known-good ECM/PCM, the recheck. If the symptom/indication goes away with a known-good ECM/PCM, then replace the orginal ECM/PCM.
More to come
Is there continunity?
YES - Go to Step 9
NO - Replace the VTEC oil pressure switch
Step 9) Turn the ignition switch to ON (II)
Step 10) Measure the voltage between VTEC oil pressure seitch 2p connector 1 and body ground.
Is there battary voltage
YES - Go to Step 15
NO - Got to Step 11
Step 11) Measure the voltage between the ECM/PCM terminal B9 and body ground
Is there battery voltage?
YES - Repair the open wire between the VTEC oil pressure switch and the ECM/PCM (B9)
NO - Go to Step 12
Step 12) Turn the ignition switch off (II)
Step 13) Disconnect the ECM/PCM connector B (24P)
Step 14) Check the continuity between ECM/PCM connector terminal B9 and body ground.
Is there continuity?
YES - Repair the short in the wire between the VTEC oil pressure switch and the ECM/PCM (B9)
NO - Update the ECM/PCM software if it does not have the latest software, or substitute a known-good ECM/PCM, the recheck. If the symptom/indication goes away with a known-good ECM/PCM, then replace the orginal ECM/PCM.
More to come
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Rep Power: 318 Step 15) Measure the voltage between VTEC oil pressure switch 2p connector terminals 1 and 2
Is there battery voltage?
YES - Go to Step 16
NO - Repair open wire between the VTEC oil pressure switch and G101.
Step 16) Turn the ignition switch off (II)
Step 17) Disconnect the VTEC soleniod valve 1p connector
Step 18) Check the resistance between VTEC soleniod valve 1p connector and body ground
Is there 14-30 ohms?
YES - Go to Step 19
NO - Replace VTEC solenoid valve
Step 19) Remove the VTEC oil pressure switch (A), and install the special tools as shown, then reinstall the VTEC oil pressure switch
Step 20) Reconnect the VTEC solenoid valve 1p connector and the VTEC oil pressure switch 2p
Step 21) Connect a tachometer
Step 22) Start the engine, put the car in park if you have an auto, neutral if you have a 5-speed. Hold the RPM's at 3000 RPM until the radiator fan comes on, don't turn off the car
Step 23) Check the oil pressure at engine speeds of 1,000, 2,000, and 4,000 rpm. Keep the measuring time as short as possible (less than 1 minute) because the engine is running with no load
[I]Is the oil pressure below 49 kPa (.0 kgf/cm^2, 7 psi)?
YES - Go to Step 24
NO - Inspect the VTEC solenoid valve
Is there battery voltage?
YES - Go to Step 16
NO - Repair open wire between the VTEC oil pressure switch and G101.
Step 16) Turn the ignition switch off (II)
Step 17) Disconnect the VTEC soleniod valve 1p connector
Step 18) Check the resistance between VTEC soleniod valve 1p connector and body ground
Is there 14-30 ohms?
YES - Go to Step 19
NO - Replace VTEC solenoid valve
Step 19) Remove the VTEC oil pressure switch (A), and install the special tools as shown, then reinstall the VTEC oil pressure switch
Step 20) Reconnect the VTEC solenoid valve 1p connector and the VTEC oil pressure switch 2p
Step 21) Connect a tachometer
Step 22) Start the engine, put the car in park if you have an auto, neutral if you have a 5-speed. Hold the RPM's at 3000 RPM until the radiator fan comes on, don't turn off the car
Step 23) Check the oil pressure at engine speeds of 1,000, 2,000, and 4,000 rpm. Keep the measuring time as short as possible (less than 1 minute) because the engine is running with no load
[I]Is the oil pressure below 49 kPa (.0 kgf/cm^2, 7 psi)?
YES - Go to Step 24
NO - Inspect the VTEC solenoid valve
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Rep Power: 318 Step 24) Turn the ignition switch off
Step 25) Disconnect the VTEC solenoid valve 1p connector
Step 26) Attach the battery positive terminal to the VTEC solenoid valve terminal
Step 27) Start the engine and check the oil pressure at 3,000 rpm
Is the oil pressure above 390 kPa(4.0 kgf/cm^2, 57 psi)
YES - Go to Step 28
NO - Inspect the VTEC soleniod valve
Step 28) With the battery positive terminal still connected to the VTEC solenoid valve, measure voltage between ECM/PCM connector terminal B9 and body ground.
Is there battery voltage above 4,000 rpm?
YES - Go to Step 29
NO - Replace the VTEC oil pressure switch
Step 29) Turn the ignition switch off
Step 30) Disconnect the battery positive terminal from the VTEC solenoid valve terminal
Step 31) Disconnect the ECM/PCM connector B (24P)
Step 32) Check the continuity between the ECM/PCM connector terminal B15 and body ground.
Is there continuity?
YES - Repair the short in the wire between the VTEC solenoid valve and the ECM/PCM(B15)
NO - Go to step 33
Step 33) Connect VTEC solenoid valve 1p connector terminal No. 1 to a body ground with a jumper wire
Step 34) Check for continuity between ECM/PCM connector terminal B15 and body ground
Is the continuity?
YES - Update the ECM/PCM software if it does not have the latest software, or substitute a known-good ECM/PCM, the recheck. If the symptom/indication goes away with a known-good ECM/PCM, then replace the orginal ECM/PCM.
NO - Repair open in the wire between the VTEC solenoid valve and the ECM/PCM (B15)
Step 25) Disconnect the VTEC solenoid valve 1p connector
Step 26) Attach the battery positive terminal to the VTEC solenoid valve terminal
Step 27) Start the engine and check the oil pressure at 3,000 rpm
Is the oil pressure above 390 kPa(4.0 kgf/cm^2, 57 psi)
YES - Go to Step 28
NO - Inspect the VTEC soleniod valve
Step 28) With the battery positive terminal still connected to the VTEC solenoid valve, measure voltage between ECM/PCM connector terminal B9 and body ground.
Is there battery voltage above 4,000 rpm?
YES - Go to Step 29
NO - Replace the VTEC oil pressure switch
Step 29) Turn the ignition switch off
Step 30) Disconnect the battery positive terminal from the VTEC solenoid valve terminal
Step 31) Disconnect the ECM/PCM connector B (24P)
Step 32) Check the continuity between the ECM/PCM connector terminal B15 and body ground.
Is there continuity?
YES - Repair the short in the wire between the VTEC solenoid valve and the ECM/PCM(B15)
NO - Go to step 33
Step 33) Connect VTEC solenoid valve 1p connector terminal No. 1 to a body ground with a jumper wire
Step 34) Check for continuity between ECM/PCM connector terminal B15 and body ground
Is the continuity?
YES - Update the ECM/PCM software if it does not have the latest software, or substitute a known-good ECM/PCM, the recheck. If the symptom/indication goes away with a known-good ECM/PCM, then replace the orginal ECM/PCM.
NO - Repair open in the wire between the VTEC solenoid valve and the ECM/PCM (B15)
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Rep Power: 318 If you need further instructions on things like inspecting and/or replacing the VTEC solenoid valve, replacing the ECM/PCM, or anything else, just post here.
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Originally Posted by kjgracing
welll the oil is fine. It does not shut off vtec completely...I have the problem with asnd without the venom vcn 400 turned on. Also my 1/4 lie times have slipped abot 61oths!!!
now I hear a weird nock from the drivers side engine if I let off @ 3K rpms.. nside motor mount maybe?
now I hear a weird nock from the drivers side engine if I let off @ 3K rpms.. nside motor mount maybe?
Hey Man Watch Out! thats exactly the same thing that was going on with my car after that safe mode bull **** ....and the noices will only get worse so go get your motor checked out by honda bc that nofo is about to blow just like mine did.....
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Rep Power: 0 Re: P1259 VTEC System Malfunction
How I can view the pictures of this great post?
Thanks
Thanks
Step 24) Turn the ignition switch off
Step 25) Disconnect the VTEC solenoid valve 1p connector
Step 26) Attach the battery positive terminal to the VTEC solenoid valve terminal
Step 27) Start the engine and check the oil pressure at 3,000 rpm
Is the oil pressure above 390 kPa(4.0 kgf/cm^2, 57 psi)
YES - Go to Step 28
NO - Inspect the VTEC soleniod valve
Step 28) With the battery positive terminal still connected to the VTEC solenoid valve, measure voltage between ECM/PCM connector terminal B9 and body ground.
Is there battery voltage above 4,000 rpm?
YES - Go to Step 29
NO - Replace the VTEC oil pressure switch
Step 29) Turn the ignition switch off
Step 30) Disconnect the battery positive terminal from the VTEC solenoid valve terminal
Step 31) Disconnect the ECM/PCM connector B (24P)
Step 32) Check the continuity between the ECM/PCM connector terminal B15 and body ground.
Is there continuity?
YES - Repair the short in the wire between the VTEC solenoid valve and the ECM/PCM(B15)
NO - Go to step 33
Step 33) Connect VTEC solenoid valve 1p connector terminal No. 1 to a body ground with a jumper wire
Step 34) Check for continuity between ECM/PCM connector terminal B15 and body ground
Is the continuity?
YES - Update the ECM/PCM software if it does not have the latest software, or substitute a known-good ECM/PCM, the recheck. If the symptom/indication goes away with a known-good ECM/PCM, then replace the orginal ECM/PCM.
NO - Repair open in the wire between the VTEC solenoid valve and the ECM/PCM (B15)
Step 25) Disconnect the VTEC solenoid valve 1p connector
Step 26) Attach the battery positive terminal to the VTEC solenoid valve terminal
Step 27) Start the engine and check the oil pressure at 3,000 rpm
Is the oil pressure above 390 kPa(4.0 kgf/cm^2, 57 psi)
YES - Go to Step 28
NO - Inspect the VTEC soleniod valve
Step 28) With the battery positive terminal still connected to the VTEC solenoid valve, measure voltage between ECM/PCM connector terminal B9 and body ground.
Is there battery voltage above 4,000 rpm?
YES - Go to Step 29
NO - Replace the VTEC oil pressure switch
Step 29) Turn the ignition switch off
Step 30) Disconnect the battery positive terminal from the VTEC solenoid valve terminal
Step 31) Disconnect the ECM/PCM connector B (24P)
Step 32) Check the continuity between the ECM/PCM connector terminal B15 and body ground.
Is there continuity?
YES - Repair the short in the wire between the VTEC solenoid valve and the ECM/PCM(B15)
NO - Go to step 33
Step 33) Connect VTEC solenoid valve 1p connector terminal No. 1 to a body ground with a jumper wire
Step 34) Check for continuity between ECM/PCM connector terminal B15 and body ground
Is the continuity?
YES - Update the ECM/PCM software if it does not have the latest software, or substitute a known-good ECM/PCM, the recheck. If the symptom/indication goes away with a known-good ECM/PCM, then replace the orginal ECM/PCM.
NO - Repair open in the wire between the VTEC solenoid valve and the ECM/PCM (B15)
#28
Re: P1259 VTEC System Malfunction
where can i get one of those books?
I'm having this same issue. I checked the screen on the solenoid but its clear. Everything seems to be hooked up fine. However, i'm ignorant when it comes to checking the electrical connections. Thought about just replacing the solenoid. found a couple on ebay for around $50
I'm having this same issue. I checked the screen on the solenoid but its clear. Everything seems to be hooked up fine. However, i'm ignorant when it comes to checking the electrical connections. Thought about just replacing the solenoid. found a couple on ebay for around $50
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Rep Power: 0 Re: P1259 VTEC System Malfunction
where can i get one of those books?
I'm having this same issue. I checked the screen on the solenoid but its clear. Everything seems to be hooked up fine. However, i'm ignorant when it comes to checking the electrical connections. Thought about just replacing the solenoid. found a couple on ebay for around $50
I'm having this same issue. I checked the screen on the solenoid but its clear. Everything seems to be hooked up fine. However, i'm ignorant when it comes to checking the electrical connections. Thought about just replacing the solenoid. found a couple on ebay for around $50