I have a technical question with my March of 1986 Toyota Pickup 4x4 Turbo pickup. I am only getting about 9 miles to the gallon out of it which I know I should be getting more. The motor is recently rebuilt along with a new turbo. My truck keeps throwing code 7 which is the throttle position sensor. I have replaced it with 6 different ones for that truck aftermarket and OEM. The problem I am having is that at the computer or at the sensor everything checks out except that I have battery voltage at IDL / E2 test and at IDL / E1 when the throttle body is opened. According to all the test sheets I have for diagnosing the throttle position sensor it should be between 4 to 6 volts. Also on IDL / E1 it says I should have 0 Ohms with the throttle valve shut but I have 844 ohms of resistance. Everything on the throttle position sensor checks out within specs if disconeted or connected, either at the computer plug in or at the sensor except for what I just described. If I clear the code, start the truck open the throttle, turn off the truck, check the code, it is instantly back. Also from time to time I will have code 6 witch is the ignitor code, but that is way less frequent and hasn’t showed up in about three months. My question is where the hell would it get battery voltage from when the throttle is opened? Is it at the ECU itself? Is there a resistor in the ECU that possibley is burned out or is the TPS intergrated into another sensor that I don’t know about? If it was a resistor in the ECU shouldn’t I get no voltage period if it is burned out?
Here are the test results
TCCS Voltage & Resistance Specs
Terminals Position of Procedure Condition Normal Volt reading Normal Resistance What I have
conector at ECU Or Ohms readings Ohms
Bat/E1 & Connected N/A N/A 10-14 volts N/A OK
+B/E1 Connected Ign On N/A 10-14 volts N/A OK
IDL/E1 Connected Ign On Throttle 4-6 volts N/A 11.66 volts
IDL/E1 Disconnected Ign Off Throttle Infinity N/A OK
IDL/E1 Disconnected Ign Off Throttle 0 Ohm 0 844Ohm
IDL/E2 Connected Ign On Throttle 4-6 volts N/A 11.66 volts
have the same problem?
Sunday, January 14th, 2007 AT 10:35 PM