Code P0115 and vsc / vsc off lights
#1
Driver School Candidate
Thread Starter
Code P0115 and vsc / vsc off lights
I have a p0115 engine temp circuit code and the vsc/ vsc off lights are on and no separate code for those lights. the p0115 threw the CEL light. I just had the valve cover gaskets replaced and now these are on. I replaced the engine temp sensor but still no change. I searched the forum and didn't see any info on the p0115 light. Thanks!
#2
I have a p0115 engine temp circuit code and the vsc/ vsc off lights are on and no separate code for those lights. the p0115 threw the CEL light. I just had the valve cover gaskets replaced and now these are on. I replaced the engine temp sensor but still no change. I searched the forum and didn't see any info on the p0115 light. Thanks!
The post says "valve cover gaskets", so presume you have a GS4.
Any engine or ABS code will trip the VSV. If you check the VSV codes, it would probably report "engine code, disabling system".
P0115 Engine Coolant Temperature Circuit Malfunction
Ground the coolant sensor, and does the coolant gauge move? If it does, you might have a bad replacement sensor.
Quick google says to check the primary O2 sensor plugs. There's (4) O2 sensors on the GS4... one "upstream" on the primary cats, and one "downstream" on the flex pipe (for each bank)... our left downstream was throwing a code, and we couldn't get the downstream O2 sensors out of the Y-pipe (rusted in), so we just replaced both, with the Y-pipe. The plugs for the downstream are inside the car in the seat area (had to replace those when we replaced the Y-pipe), not sure where the upstream plugs are... guessing they might be in the engine bay. They might have been disturbed while they were working on the gaskets.
#3
Driver School Candidate
Thread Starter
Sensor plugs
I replaced the coolant sensor with a known good one( i have another Gs430 as well. Switch is good. Thanks for the info on the 02 plugs. I will check those ASAP.
#4
Lexus Test Driver
I have a p0115 engine temp circuit code and the vsc/ vsc off lights are on and no separate code for those lights. the p0115 threw the CEL light. I just had the valve cover gaskets replaced and now these are on. I replaced the engine temp sensor but still no change. I searched the forum and didn't see any info on the p0115 light. Thanks!
I'd like to see if its an open or short in the wiring since you said you replaced the sensor already.
Thanks.
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tymeboy (02-22-19)
#5
Driver School Candidate
Thread Starter
So I figured out that the car has two temp sensors. One behind the thermostat ( pictured) and one in the radiator at the bottom driver side. The one I replaced was the radiator sensor. No change. I replaced the sensor behind the thermostat and the CEL and the vsc lights went out. However, I am still not getting a reading on the temp gauge and the car is idling at about 2400 rpm. What gives? Thanks guys!
#7
Lexus Test Driver
Glad you figured it out.
Temp sensor in the radiator is for the AC temp switch.
The one by the t-stat is output signal going to the ECU
The ECU then transmits the signal to the temp gauge receiver in the combo meter.
If you can see engine temp (im assuming this is engine coolant temp) on your scanner and not on the combo, you possibly have a bad temp gauge in the combo meter.
Did your temp gauge work prior to the work that was done?
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#11
Lexus Test Driver
Great sugg sbagdon.
If its a 2 wire connector on the temp sensor,
Disconnect the connector
Jumper wire the 2 terminals.
This would show max temp on your data list and hope it nudges the temp gauge.
Curious, the data list you provided for the temp gauge.
Was this on a cold motor?
Its only reading ~80 degrees.
At 80 degrees, i doubt the temp gauge would even raise up.
If its a 2 wire connector on the temp sensor,
Disconnect the connector
Jumper wire the 2 terminals.
This would show max temp on your data list and hope it nudges the temp gauge.
Curious, the data list you provided for the temp gauge.
Was this on a cold motor?
Its only reading ~80 degrees.
At 80 degrees, i doubt the temp gauge would even raise up.
#13
Lexus Test Driver
It should be just as hot as the top radiator hose when the T-stat opens.
Fans should kick ON once they see temps go around 195+ degrees F
Not at 90 degrees.
#15
Great sugg sbagdon.
If its a 2 wire connector on the temp sensor,
Disconnect the connector
Jumper wire the 2 terminals.
This would show max temp on your data list and hope it nudges the temp gauge.
Curious, the data list you provided for the temp gauge.
Was this on a cold motor?
Its only reading ~80 degrees.
At 80 degrees, i doubt the temp gauge would even raise up.