Curtice
SILVER Star
For a 3FE (1989) in an FJ40, but putting here for 3FE guru help.
I think this might all be related to the same underlying issue, but could be separate issues. I've had a problem for some time that I have kind of ignored, but seems to be getting worse. Symptoms:
I've started digging into the FSM to troubleshoot but honestly not quite sure on the "how" to use the multimeter in this case. Here is the page from the FSM that says how to troubleshoot code 41 TPS.
So first, the ECU terminal testing. First step says to test fit voltage between terminals IDL and E2 with the ignition on and throttle open. I did this test and got 4.46 volts, which is within spec. I went to step 2 and was able to get 12 bolts on that test between +B and +B1 to ground.
So then it said test between terminal E1 and ground. This is where I got confused. This diagram explains the terminals and where E1 is located:
It shows it as the 4th terminal in bottom left. So on my ECU, this wire is is brown/black:
but on this wiring diagram, it says E1 is a brown wire, not brown black. The other wires appear correct.
Did the wire colors differ nu
Anyway, assuming this is E1, I probed and measured ohms between that terminal and the battery ground. Got 4.4 ohms. I read that less than 5 means a good ground.
So I’m assuming my ECU is ok. On to the TPS.
This is from a different TPS thread:
—-With the throttle closed (measured at the TPS with the connector off)
VTA-E2 is .539 K ohms (which is 539 ohms)
IDL-E2 is 17.3 ohms
VC-E2 is 6.29K ohms (this won't change no matter what the throttle position)—-
I did these and got:
VTA-E2 634 ohms (mm read 634 set at 2000)
IDL-E2 8.6 ohms (mm read 8.6 set at 200)
VC-E2 6.46k ohms (mm read 6.46 set at 20k)
This is where I am at now.the above numbers appear in spec, exceptI’m not sure about IDL-E2, since FSM doesn’t give that spec without a thickness gauge.
Next the fsm says to put a .77mm thickness gauge between the lever and stop screw and measure IDL-E2. But I cannot get the gauge in there...there is just no space. Am I supposed to take the whole throttle body off for this part (instructions in the fsm say this is on vehicle inspection). I cannot figure out how to insert the gauge.
So with all that, any ideas based on my symptoms and numbers? I’m not sure how to interpret this stuff...
I think this might all be related to the same underlying issue, but could be separate issues. I've had a problem for some time that I have kind of ignored, but seems to be getting worse. Symptoms:
- Super low idle once the engine warms up. About 50% of the time, engine will die if I come to a stop and idle. Always starts right back up again.
- Insanely sensitive throttle in first gear, and a little bit in 2nd. Barely touch the pedal and it lurches hard. I can't drive on any type of slightly bumpy road because my foot will bounce, causing me to press the pedal and jerk forward like crazy. Obviously any wheeling or mountain roads are out of the question right now.
- CEL light diagnostic code of 41 (throttle position sensor) and 42 (speed sensor).
I've started digging into the FSM to troubleshoot but honestly not quite sure on the "how" to use the multimeter in this case. Here is the page from the FSM that says how to troubleshoot code 41 TPS.
So first, the ECU terminal testing. First step says to test fit voltage between terminals IDL and E2 with the ignition on and throttle open. I did this test and got 4.46 volts, which is within spec. I went to step 2 and was able to get 12 bolts on that test between +B and +B1 to ground.
So then it said test between terminal E1 and ground. This is where I got confused. This diagram explains the terminals and where E1 is located:
It shows it as the 4th terminal in bottom left. So on my ECU, this wire is is brown/black:
but on this wiring diagram, it says E1 is a brown wire, not brown black. The other wires appear correct.
Did the wire colors differ nu
Anyway, assuming this is E1, I probed and measured ohms between that terminal and the battery ground. Got 4.4 ohms. I read that less than 5 means a good ground.
So I’m assuming my ECU is ok. On to the TPS.
This is from a different TPS thread:
—-With the throttle closed (measured at the TPS with the connector off)
VTA-E2 is .539 K ohms (which is 539 ohms)
IDL-E2 is 17.3 ohms
VC-E2 is 6.29K ohms (this won't change no matter what the throttle position)—-
I did these and got:
VTA-E2 634 ohms (mm read 634 set at 2000)
IDL-E2 8.6 ohms (mm read 8.6 set at 200)
VC-E2 6.46k ohms (mm read 6.46 set at 20k)
This is where I am at now.the above numbers appear in spec, exceptI’m not sure about IDL-E2, since FSM doesn’t give that spec without a thickness gauge.
Next the fsm says to put a .77mm thickness gauge between the lever and stop screw and measure IDL-E2. But I cannot get the gauge in there...there is just no space. Am I supposed to take the whole throttle body off for this part (instructions in the fsm say this is on vehicle inspection). I cannot figure out how to insert the gauge.
So with all that, any ideas based on my symptoms and numbers? I’m not sure how to interpret this stuff...