I was wondering if someone had any good suggestions on clearing code 52 I'm really stuck between a rock and a hard place with this code (i.e. no passing smog =s I cant use the car) and I'm pretty much stumped now. The code pops up around the ~3k RPM range.
Note this is for a 90 7MGTE in a Mk2. The motor is brand new and runs perfect this is the only code shown. With the exception of the Ross pistons the hard parts are basically stock.
Just for history the car this came out of had code 52 when I pulled it. Since the front of the water pump was busted off I really couldn't run it enough to diagnose it. Anyways upon disassembly I discovered the front knock sensor was busted off and the plug was hanging loose. So I figured this for the code so I grabbed a junkyard sensor and used that. While I was in the area I also bought new connectors and spliced them onto the orginal harness.
Once in the Mk2 I still have code 52. I was 99% sure the wiring was OK so I get another knock sensor and try shuffling them around. I still have a code so I did the full rewire using microphone coax with an engine bay drain wire going to an engine ground. Still has the code so I rewire it again using correct awg Alpha coax cable with the drain wire grounded under the dash. Still no luck so I buy 2 new Toyota knock sensors. The code is still there so I try a rewire with a foil shield cable. That didn't help so I splurged the money on a new engine harness. Swap that in an I still have the code so I used a known good ECU and the code still pops up. I've even tried swapping the MSD wires out for the old stocker to ease any EMI worries with no luck So this leaves me very frustrated with a new 7M thats basically useless.
The cliffnotes
Incurable code 52/knock sensor
-new engine
-2 new knock sensors (& I've tried about 6 used ones)
-new engine harness (also tried with 3 different rewires)
-the sensors have good grounds (about .1 ohm)
-tried another ECU
-code keeps popping up around 3k RPM
I haven't seen much in search that I haven't done yet. For those that like pictures here is the bastard 7M :madfawk:
Note this is for a 90 7MGTE in a Mk2. The motor is brand new and runs perfect this is the only code shown. With the exception of the Ross pistons the hard parts are basically stock.
Just for history the car this came out of had code 52 when I pulled it. Since the front of the water pump was busted off I really couldn't run it enough to diagnose it. Anyways upon disassembly I discovered the front knock sensor was busted off and the plug was hanging loose. So I figured this for the code so I grabbed a junkyard sensor and used that. While I was in the area I also bought new connectors and spliced them onto the orginal harness.
Once in the Mk2 I still have code 52. I was 99% sure the wiring was OK so I get another knock sensor and try shuffling them around. I still have a code so I did the full rewire using microphone coax with an engine bay drain wire going to an engine ground. Still has the code so I rewire it again using correct awg Alpha coax cable with the drain wire grounded under the dash. Still no luck so I buy 2 new Toyota knock sensors. The code is still there so I try a rewire with a foil shield cable. That didn't help so I splurged the money on a new engine harness. Swap that in an I still have the code so I used a known good ECU and the code still pops up. I've even tried swapping the MSD wires out for the old stocker to ease any EMI worries with no luck So this leaves me very frustrated with a new 7M thats basically useless.
The cliffnotes
Incurable code 52/knock sensor
-new engine
-2 new knock sensors (& I've tried about 6 used ones)
-new engine harness (also tried with 3 different rewires)
-the sensors have good grounds (about .1 ohm)
-tried another ECU
-code keeps popping up around 3k RPM
I haven't seen much in search that I haven't done yet. For those that like pictures here is the bastard 7M :madfawk:
