TPS sensor went out - ZR-1 Net Registry Forums

Billy Mild · 01-21-2017

Today when driving the corvette my "Service Engine Soon" light came on and off during my drive today. I shut the car off, when I restart it the SES light was still on. I had my ALDL connector and ALDLDroid with me and it showed, Code 22 TPS too low. My idle was really high. I shut the car off and unplugged the IAC then restarted, same thing higher than normal idle. I got the TPS Code to clear and got on the road. On the way home it would turn on and off.

I got home and the SES was solid ON. Code 22 was still being displayed on my scanner. My car's idle was not good, higher than normal and shaky. There was a different type of smell coming from the exhaust as well.

Could a bad TPS sensor cause this type of problem? It was just replaced last year by Mr. Haibeck.

Marc Haibeck · 01-22-2017

Maybe the sensor has failed already. There could be a problem with the cable or the connector. I wonder what the voltage is between pins A and B on the connector? The voltage between pins A and C?

Billy Mild · 01-22-2017

I haven't done that testing. With my scanner plugged in, the TP percentage was 19%, and the voltage on the scanner was 0.00.

To do the testing you mention does the car need to be on and running?

Marc Haibeck · 01-22-2017

Perform the voltage measurements with the ignition on and the engine not running.

Tug on the cable to see if the motion effects the voltage readings. Is the connector plugged in until the retainer engages?

Billy Mild · 01-23-2017

I unplugged the TPS connector and checked voltages with a volt meter. PIN A and B hooked up showed 0 Volts. PIN A and C showed 4.99 volts.

I hooked up my scanner today and it seems to be reading okay with the engine off and cold. I was 0.52 volts on my scanner, and when at WOT it reads 4.72 volts.

LGAFF · 01-23-2017

Might have a break in the wire that's connecting/disconnecting; I had that occur and every time the car started the engine raced

Billy Mild · 01-23-2017

Quote:

Originally Posted by LGAFF

Might have a break in the wire that's connecting/disconnecting; I had that occur and every time the car started the engine raced

How did you go about testing this theory out? I ordered a new TPS to see if that changes anything.

LGAFF · 01-23-2017

pretty high tech....wiggle the wires.

Billy Mild · 01-23-2017

Quote:

Originally Posted by LGAFF

pretty high tech....wiggle the wires.

Was it the pins in the connector that went bad or did you have to replace some part of the wiring harness?

I bought just the TPS by itself, there was a kit that included a new plug and some wiring.

Marc Haibeck · 01-24-2017

It seems like the TPS is working correctly now. Tug on the wires and the connector while watching the scanner. If it continues to work correctly, I would drive the car. Maybe there was poor connection and now it is okay.

Is the locking tab on the connector still in place? If not replace the connector or tie it to the sensor with a wire tie.

01-21-2017	#1
Billy Mild Join Date: Aug 2014 Location: Kansas City, MO Posts: 838	TPS sensor went out Today when driving the corvette my "Service Engine Soon" light came on and off during my drive today. I shut the car off, when I restart it the SES light was still on. I had my ALDL connector and ALDLDroid with me and it showed, Code 22 TPS too low. My idle was really high. I shut the car off and unplugged the IAC then restarted, same thing higher than normal idle. I got the TPS Code to clear and got on the road. On the way home it would turn on and off. I got home and the SES was solid ON. Code 22 was still being displayed on my scanner. My car's idle was not good, higher than normal and shaky. There was a different type of smell coming from the exhaust as well. Could a bad TPS sensor cause this type of problem? It was just replaced last year by Mr. Haibeck. __________________ Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration

01-22-2017	#2
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 241	Re: TPS sensor went out Maybe the sensor has failed already. There could be a problem with the cable or the connector. I wonder what the voltage is between pins A and B on the connector? The voltage between pins A and C?

01-22-2017	#3
Billy Mild Join Date: Aug 2014 Location: Kansas City, MO Posts: 838	Re: TPS sensor went out I haven't done that testing. With my scanner plugged in, the TP percentage was 19%, and the voltage on the scanner was 0.00. To do the testing you mention does the car need to be on and running? __________________ Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration

01-22-2017	#4
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 241	Re: TPS sensor went out Perform the voltage measurements with the ignition on and the engine not running. Tug on the cable to see if the motion effects the voltage readings. Is the connector plugged in until the retainer engages?

01-23-2017	#5
Billy Mild Join Date: Aug 2014 Location: Kansas City, MO Posts: 838	Re: TPS sensor went out I unplugged the TPS connector and checked voltages with a volt meter. PIN A and B hooked up showed 0 Volts. PIN A and C showed 4.99 volts. I hooked up my scanner today and it seems to be reading okay with the engine off and cold. I was 0.52 volts on my scanner, and when at WOT it reads 4.72 volts. __________________ Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration

01-23-2017	#6
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: TPS sensor went out Might have a break in the wire that's connecting/disconnecting; I had that occur and every time the car started the engine raced __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

01-23-2017	#8
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: TPS sensor went out pretty high tech....wiggle the wires. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

01-24-2017	#10
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 241	Re: TPS sensor went out It seems like the TPS is working correctly now. Tug on the wires and the connector while watching the scanner. If it continues to work correctly, I would drive the car. Maybe there was poor connection and now it is okay. Is the locking tab on the connector still in place? If not replace the connector or tie it to the sensor with a wire tie.