Engine Stop Working / Engine immobilizer? - Club Lexus Forums

Log In 

Engine Stop Working / Engine immobilizer?

Reply
 
 
 
Thread Tools Search this Thread
Old 10-18-11, 04:34 AM   #1
dwafford
Driver School Candidate
Thread Starter
 
Join Date: Oct 2011
Location: GA
Posts: 9
Default Engine Stop Working / Engine immobilizer?

'06 SC430 was running fine. One day noticed a misfire. Scan showed misfire cylinder 5. Checked plug, wiring, coil, found no problem. Next day, running very rough, scan showed misfire cylinders 1, 3, 5, 7. A couple of days later, the engine wouldn't start at all, scan showed faults in both cam position sensor and crankshaft position sensor circuits. Didn't really believe this because of the progressive nature of the faults, but replaced the cam position sensor anyway. No change. Hesitate to change the crank position sensor. Acts like immobilizer has been activated: engine starts and runs for 1 sec, then shuts down. Many thanks for suggestions.

Last edited by VVTiBob; 10-18-11 at 08:02 AM.
dwafford is offline   Reply With Quote
Old 10-18-11, 07:24 AM   #2
VVTiBob
Moderator
 
Join Date: Dec 2009
Location: San Diego, CA
Posts: 2,003
Default

Can you provide us the actual DTC codes that showed up? Potential problem areas are:
  • Engine Wire
  • Connectors
  • Vacuum hoses/connectors
  • Ignition system
  • Fuel Pressure
  • MAF Sensor
  • Coolant Temp Sensor
  • Compression Issues
  • Valve clearance and timing issues
  • PCV hose
  • ECM controller

To name a few.

Has the Check Engine light come on? If so, is it solid or blinking? The one component consistent with all the failure you've cited is the ECM... but it difficult to tell with the info you've provided.

Last edited by VVTiBob; 10-18-11 at 07:46 AM.
VVTiBob is offline   Reply With Quote
Old 10-18-11, 07:56 AM   #3
VVTiBob
Moderator
 
Join Date: Dec 2009
Location: San Diego, CA
Posts: 2,003
Default

BTW Since you asked the identical question in the "Engine Immobilizer" thread I deleted that thread and merged them together.
VVTiBob is offline   Reply With Quote
Old 10-19-11, 11:09 AM   #4
dwafford
Driver School Candidate
Thread Starter
 
Join Date: Oct 2011
Location: GA
Posts: 9
Default DTC codes

In addition to the cylinder misfire codes that were set while the engine was still running (P0301, 03, 05, 07), the codes that I read when the engine failed to start were P0335 and P0340 (I think. I didn't write these down, but when I read the DTC code descriptions, these are the two I remember seeing).

I agree with your statement that a number of components and/or systems could cause this failure, but I'm hoping perhaps there's something in the progression of faults that occurred (cyl 1 misfire, then all of left bank cyl misfires, then cam position sensor and crankshaft position sensor) that might point to a common cause.

Regarding your comment about the VVT solenoid, if that failed, shouldn't it have set a VVT fault code? And about the ECM, that was an early suspect. I removed it and sent it to a place in Texas that tests them, and they sent it back with a clean bill of health.

I read a technician post recently that said if the engine immobilizer was set (I had thought this might be a possibility), the engine would crank but not start at all. This engine starts and runs for 1 second or less, then dies. Do you agree this could not be the immobilizer?

I had also considered the possibility of a fuel pump failure, but if that was the case, I think after a few tries the fuel lines would be completely empty, and the engine wouldn't run even momentarily.

I saw another post that described similar symptoms, and the cure turned out to be cleaning the VVT OCV. Do you think that might be a possibility?

I consider it wildly improbable that there's any connection, but just in case, just about the same time the engine started acting up, the retractable top also stopped working correctly. I can get it to cycle only by repeatedly pushing the switch many times (15-20 or so), with it moving only a tiny bit with each repeated push of the switch - and even then, when the top goes up, the quarter windows do not.

Thanks again for your help. Hope I can return the favor to someone on here someday.
dwafford is offline   Reply With Quote
Old 10-19-11, 12:59 PM   #5
Jabberwock
Moderator
 
Jabberwock's Avatar
 
Join Date: Sep 2009
Location: Alabama
Posts: 2,982
Default

So your engine won't run and your top won't cycle? I wish I could be more helpful in terms of technical repair info but my worry would be that the two failures are interconnected, if it were me and my car was basically bricked - I'd call a tow truck and get it to Lexus. Pay them to at least diagnose the problem.
Jabberwock is offline   Reply With Quote
Old 10-19-11, 02:32 PM   #6
VVTiBob
Moderator
 
Join Date: Dec 2009
Location: San Diego, CA
Posts: 2,003
Default

The common thread so far in the DTCs you've mentioned is the ECM, yet you've said it passed what ever test was done to it. Have you inspected the wire harness and connectors to the ECM?

The next steps in the FSM will be to break out the volt/ohm meter and begin testing components and connections to the ECM, But at this point I'm with Jabberwock, time for a thorough diagnostic at your local dealer or with a Lexus master mechanic.
VVTiBob is offline   Reply With Quote
Old 10-19-11, 10:24 PM   #7
talwang
Moderator
iTrader: (4)
 
talwang's Avatar
 
Join Date: Jan 2004
Location: NASA
Posts: 2,227
Default

The issues you have more likely require a Lexus trained mechanic/technician with some Lexus diagnostic tools to perform the job properly.
Most shops won't spend that much on diagnostic tools that can get all of you Lexus specific codes.
talwang is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
sc400 does not start clamsoup Performance & Maintenance 8 04-15-15 08:32 PM
Ls430 With Many Codes P1354 And So On... kentgs300 LS - 3rd Gen (2001-2006) 37 11-24-14 11:44 AM
2000 RX300-running horrible, throwing a ton of codes Designer17 RX - 1st Gen (1999-2003) 4 04-03-13 10:53 AM
1999 LX470 misfiring gorm2 LX - 1st and 2nd Gen (1997-2007) 3 08-12-12 11:06 PM
16 obd2 codes on a 2000 gs400...please help!!!! erknjerk78 Performance 1 09-11-11 07:26 PM


Tags
470, carolina, delete, engine, gs300, immobiliser, immobilizer, immoblizer, lexus, lx, reset, sc430, south, stopped, system, work

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -7. The time now is 03:46 PM.


Copyright © 2000-2016 Internet Brands, Inc. All Rights Reserved