Hope someone out there can advise me.
History-07 GX470 approx 130k miles threw a code P1445. Diagnosed with ScanGauge 2, reset code and it went away for 2 weeks. Reappeared and ordered a Vacuum Switch Valve (VSV) at recommendation of a mechanic friend. By the time the part arrived CEL had disappeared of its own accord (which I find strange). Being the frugal guy that I am I decided to change out one of the VSV's with new one because I have it.
With the service manual I determined means of checking switches (VSV's are located on passenger side of intake manifold and very easy to access, change, etc) which a voltmeter by way of continuity. I CAN NOT determine which VSV is bank 1 and which is bank 2. I have the service manual and do not find any reference to which is which. I determine to test both by continuity as shown in manual and find that both are with in resistance range of 33-39 ohm (both read 35ish). New part is 36 ohm. All 3 check out at 0 when testing between pole and ground on part.
I reassembled everything with one of the 2 VSV being new and one original (only purchased one because p1445 is ONLY bank 2, part is approx $60). No issues with reassembly which included air intake assembly from throttle body to filter housing.
Now I get a CEL (flashing) and find new code P0306 (cylinder 6 misfire, thus flashing CEL). Noticeable miss at low RPM. I check everything visually and find no obvious issues. I did realize before starting that I had swapped the vacuum hoses on both VSV's and corrected before I started based on pics prior to tear down. There are 2 vac ports, one on top of another and thus the confusion.
I disassembled the entire repair (15 min job) inspected all the vacuum hoses and confirmed the electrical connections and RE-assembled. At start up noticed still rough and still showing P0306. Reset with ScanGauge had no effect and CEL (flashing) came back immediately. Test drove around the block and normally perfect car had noticeable miss.
I disassembled again and pulled cylinder 6 coil and spark plug. Plug looked new but I have same Nipondenso plug on hand (for my LX470 same part number). Gauged new plug to .051 as found in manual reinstalled. Same problem, same code.
Questions-
What is the connection between P1445 and P0306?
Being that I am confident that I have not left any vacuum hoses unattached and all the electrical connections have been checked, what can I check now? Many of the things in the manual require computer equipment I do not have?
What have I done to an otherwise perfect vehicle (did I mention its my wife's?)
History-07 GX470 approx 130k miles threw a code P1445. Diagnosed with ScanGauge 2, reset code and it went away for 2 weeks. Reappeared and ordered a Vacuum Switch Valve (VSV) at recommendation of a mechanic friend. By the time the part arrived CEL had disappeared of its own accord (which I find strange). Being the frugal guy that I am I decided to change out one of the VSV's with new one because I have it.
With the service manual I determined means of checking switches (VSV's are located on passenger side of intake manifold and very easy to access, change, etc) which a voltmeter by way of continuity. I CAN NOT determine which VSV is bank 1 and which is bank 2. I have the service manual and do not find any reference to which is which. I determine to test both by continuity as shown in manual and find that both are with in resistance range of 33-39 ohm (both read 35ish). New part is 36 ohm. All 3 check out at 0 when testing between pole and ground on part.
I reassembled everything with one of the 2 VSV being new and one original (only purchased one because p1445 is ONLY bank 2, part is approx $60). No issues with reassembly which included air intake assembly from throttle body to filter housing.
Now I get a CEL (flashing) and find new code P0306 (cylinder 6 misfire, thus flashing CEL). Noticeable miss at low RPM. I check everything visually and find no obvious issues. I did realize before starting that I had swapped the vacuum hoses on both VSV's and corrected before I started based on pics prior to tear down. There are 2 vac ports, one on top of another and thus the confusion.
I disassembled the entire repair (15 min job) inspected all the vacuum hoses and confirmed the electrical connections and RE-assembled. At start up noticed still rough and still showing P0306. Reset with ScanGauge had no effect and CEL (flashing) came back immediately. Test drove around the block and normally perfect car had noticeable miss.
I disassembled again and pulled cylinder 6 coil and spark plug. Plug looked new but I have same Nipondenso plug on hand (for my LX470 same part number). Gauged new plug to .051 as found in manual reinstalled. Same problem, same code.
Questions-
What is the connection between P1445 and P0306?
Being that I am confident that I have not left any vacuum hoses unattached and all the electrical connections have been checked, what can I check now? Many of the things in the manual require computer equipment I do not have?
What have I done to an otherwise perfect vehicle (did I mention its my wife's?)
