I had another look at the ground wire, actually two ground wires. The TPS adjustment for the XJ with auto tranny, adjusts the TCU (tranny) side of the TPS (4 pin connector) the ground on mine is a orange with tan strip (black from the TPS to the connector). The three wire connector, is for the ECU and the ground wire is brown with a strip (black I think) and the TPS side of the 3 pin connector ground is also black. The ECU side of the TPS, is considered adjusted, when the tranny side is properly adjusted. Guess the TPS is more critical for the tranny, than for the ECU I had another look at the ground wire, actually two ground wires. The TPS adjustment for the XJ with auto tranny, adjusts the TCU (tranny) side of the TPS (4 pin connector) the ground on mine is a orange with tan strip (black from the TPS to the connector). The three wire connector, is for the ECU and the ground wire is brown with a strip (black I think) and the TPS side of the 3 pin connector ground is also black. The ECU side of the TPS, is considered adjusted, when the tranny side is properly adjusted. Guess the TPS is more critical for the tranny, than for the ECU.
The orange ground wire, from the four pole (tranny) side of the TPS, goes to the TCU and goes through what tests like a capasitor, then back out of the TCU to ground. The D-3 pin into the TCU (orange with a tan strip) and the D-7 pin out to ground.
Alldata says if the standing current in the orange and tan wire to the TCU, is more than 0.1 volt, a ground can be added. Don´t really know how it would affect the capacitor, in the TCU though. Mine has 0.8 volts of standing current, in the TPS to TCU ground circuit. The TPS to ECU ground circuit, has 0 resistance and no standing voltage (looks good).
If I´m wrong, please somebody explain it to me, I spent hours with an old wiring harness in my driveway this morning following wires. Took me awhile to kind of figure it out. I never did find the TCU ground (D-7 pin to chassis).
My problem is an occasional. lock, unlock, lock, unlock, chatter at almost exactly 2000 RPM or about 1/3, pedal, I can accelerate right through it with no problem, but in fourth and a steady 2000 RPM, it will chatter on occasion. Don´t really know if it´s the low TPS in voltage or the TPS to ground resistance or just a bad TPS. But it did improve some, when I cleaned the connector and the TPS in voltage went up some and after the TPS adjustment.
I had another look at the ground wire, actually two ground wires. The TPS adjustment for the XJ with auto tranny, adjusts the TCU (tranny) side of the TPS (4 pin connector) the ground on mine is a orange with tan strip (black from the TPS to the connector). The three wire connector, is for the ECU and the ground wire is brown with a strip (black I think) and the TPS side of the 3 pin connector ground is also black. The ECU side of the TPS, is considered adjusted, when the tranny side is properly adjusted. Guess the TPS is more critical for the tranny, than for the ECU.
The orange ground wire, from the four pole (tranny) side of the TPS, goes to the TCU and goes through what tests like a capasitor, then back out of the TCU to ground. The D-3 pin into the TCU (orange with a tan strip) and the D-7 pin out to ground.
Alldata says if the standing current in the orange and tan wire to the TCU, is more than 0.1 volt, a ground can be added. Don´t really know how it would affect the capacitor, in the TCU though. Mine has 0.8 volts of standing current, in the TPS to TCU ground circuit. The TPS to ECU ground circuit, has 0 resistance and no standing voltage (looks good).
If I´m wrong, please somebody explain it to me, I spent hours with an old wiring harness in my driveway this morning following wires. Took me awhile to kind of figure it out. I never did find the TCU ground (D-7 pin to chassis).
My problem is an occasional. lock, unlock, lock, unlock, chatter at almost exactly 2000 RPM or about 1/3, pedal, I can accelerate right through it with no problem, but in fourth and a steady 2000 RPM, it will chatter on occasion. Don´t really know if it´s the low TPS in voltage or the TPS to ground resistance or just a bad TPS. But it did improve some, when I cleaned the connector and the TPS in voltage went up some and after the TPS adjustment.
I had another look at the ground wire, actually two ground wires. The TPS adjustment for the XJ with auto tranny, adjusts the TCU (tranny) side of the TPS (4 pin connector) the ground on mine is a orange with tan strip (black from the TPS to the connector). The three wire connector, is for the ECU and the ground wire is brown with a strip (black I think) and the TPS side of the 3 pin connector ground is also black. The ECU side of the TPS, is considered adjusted, when the tranny side is properly adjusted. Guess the TPS is more critical for the tranny, than for the ECU.
The orange ground wire, from the four pole (tranny) side of the TPS, goes to the TCU and goes through what tests like a capasitor, then back out of the TCU to ground. The D-3 pin into the TCU (orange with a tan strip) and the D-7 pin out to ground.
Alldata says if the standing current in the orange and tan wire to the TCU, is more than 0.1 volt, a ground can be added. Don´t really know how it would affect the capacitor, in the TCU though. Mine has 0.8 volts of standing current, in the TPS to TCU ground circuit. The TPS to ECU ground circuit, has 0 resistance and no standing voltage (looks good).
If I´m wrong, please somebody explain it to me, I spent hours with an old wiring harness in my driveway this morning following wires. Took me awhile to kind of figure it out. I never did find the TCU ground (D-7 pin to chassis).
My problem is an occasional. lock, unlock, lock, unlock, chatter at almost exactly 2000 RPM or about 1/3, pedal, I can accelerate right through it with no problem, but in fourth and a steady 2000 RPM, it will chatter on occasion. Don´t really know if it´s the low TPS in voltage or the TPS to ground resistance or just a bad TPS. But it did improve some, when I cleaned the connector and the TPS in voltage went up some and after the TPS adjustment.[QUOTE/]
I checked further and found about .8v on the ground wire, and when checked for current, it flows about 5MA to engine ground. (I can't run an auxillary ground wire, because then I'd get a constant 5MA battery drain...???)
