Mudders,
Lend me your ears.
I am currently getting a CEL Code 52 (Knock Sensor No. 1) that will not go away.
Backstory - Friday, pulling out of Central NC and got a CEL. Pulled into an autozone parking lot up the street, jumped the diagnostic connectors and revealed a code 52 (Knock Sensor No. 1). Went to inspect the knock sensor and the wire had broken off from the sensor at the connector. Called the Toyota dealership in VB where I was heading and ordered the appropriate pig tail to splice in when I arrived. Drove the truck in Safe Mode up (Took Country roads, Kept it around 2000 rpm at max) and installed the new pigtail and aftermarket sensor Saturday morning. Drove the truck around Saturday evening with no issue or CEL what so ever.. Sunday evening, CEL came on again.
Here's what I've done.
Replaced Knock Sensor, albeit with an Aftermarket one. Verified that it works via oscilloscope.
Checked continuity along the wire from the sensor to the ECM. Was not able to get an OHM reading down the wire (from sensor cap to appropriate pinned connector in the 16 pin ECM connector, however was able to generate a AC Voltage reading increase at the ECM connector when stimulating the sensor at the block with the wire connected)
Checked spark plugs. All good.
Filled the truck up with High Octane Gas.
Checked Timing. 9-10 BTDC.
Reset codes. No change. Even after it drops the code, the engine timing only retards 3ish degrees to 6-7 BTDC.
Timing is spot on at 9-10 BTDC. No loud knocking. No sputtering. No lurching. No drop in power. When putting the OBD1 ECM into Service mode it drops my timing to 5 BTDC.
Trying to hunt this electrical gremlin down.. I'm assuming its the wire. Only assuming because I have not received any codes for the No. 2 Knock Sensor, performance of the engine does not suffer terribly at current timing, engine temps stay the same, just the CEL light comes on.
HAAAAALLLLLPPPP!!!! I need the cruiser guru's to weigh in on this one, as shy of routing a co-ax from the sensor to the ECM I've done what I've found most mudders doing on the Forum.
Lend me your ears.
I am currently getting a CEL Code 52 (Knock Sensor No. 1) that will not go away.
Backstory - Friday, pulling out of Central NC and got a CEL. Pulled into an autozone parking lot up the street, jumped the diagnostic connectors and revealed a code 52 (Knock Sensor No. 1). Went to inspect the knock sensor and the wire had broken off from the sensor at the connector. Called the Toyota dealership in VB where I was heading and ordered the appropriate pig tail to splice in when I arrived. Drove the truck in Safe Mode up (Took Country roads, Kept it around 2000 rpm at max) and installed the new pigtail and aftermarket sensor Saturday morning. Drove the truck around Saturday evening with no issue or CEL what so ever.. Sunday evening, CEL came on again.
Here's what I've done.
Replaced Knock Sensor, albeit with an Aftermarket one. Verified that it works via oscilloscope.
Checked continuity along the wire from the sensor to the ECM. Was not able to get an OHM reading down the wire (from sensor cap to appropriate pinned connector in the 16 pin ECM connector, however was able to generate a AC Voltage reading increase at the ECM connector when stimulating the sensor at the block with the wire connected)
Checked spark plugs. All good.
Filled the truck up with High Octane Gas.
Checked Timing. 9-10 BTDC.
Reset codes. No change. Even after it drops the code, the engine timing only retards 3ish degrees to 6-7 BTDC.
Timing is spot on at 9-10 BTDC. No loud knocking. No sputtering. No lurching. No drop in power. When putting the OBD1 ECM into Service mode it drops my timing to 5 BTDC.
Trying to hunt this electrical gremlin down.. I'm assuming its the wire. Only assuming because I have not received any codes for the No. 2 Knock Sensor, performance of the engine does not suffer terribly at current timing, engine temps stay the same, just the CEL light comes on.
HAAAAALLLLLPPPP!!!! I need the cruiser guru's to weigh in on this one, as shy of routing a co-ax from the sensor to the ECM I've done what I've found most mudders doing on the Forum.