Toyota Repair Problems? Ask a Mechanic for Answers ASAP
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If you jump the Te1 and E1 pins in the diagnostic box (same one as the FP pin ) are there any engine codes? Is the check engine light on with the key in the on position?
Use the method in the link below to check for codes and let me know what you find.
Click the link below. The violet wire on the top right of page for is pin 5 of connector A there needs to be 12 volts at this wire. This is the check engine light circuit. Check with a voltmeter not a test light. The engine will not start if the check engine light is not on with the key on. That is why I asked this previously. If you ground this violet wire the check engine light should come on if you have 12 volts on this wire.
Click the link below for a better view. The computer turns the check engine light by grounding this wire. If you have 12 volts at this wire then the bulb is ok.
There are 3 connectors listed at the bottom of the wiring diagram E6 to E8 or A,B,C. The computer is behind the right kick panel. Connector E6 is the forward most connector. and the pin identifier is on the bottom of the wiring diagram.
You mentioned that the Check engine light will not light up at all with the key on. Is this still the case and the truck is still a no start correct?
At the TPS and/or the Air Flow Meter check the voltage of the G-B (green with black tracer) wire with the key on and the battery fully charged. These are shown on page 4 of the wiring diagram above. Let me know the reading. I have to step out for a couple of hours but I will check back later tonight.
Now we are getting somewhere! This has to be 5 volts if the line gets shorted to ground it shuts the computer down and the check engine light. While monitoring the voltage unplug the MAF and the tps one at a time and let me know if the voltage jumps to 5 volts with the battery fully charged and the key on.
Remember that as we go forward my directions to the next steps are based solely on the accuracy of your readings. Make sure you have a good ground and are one the proper scale on the meter.
Next unplug the MAF and TPS and all the connectors to the computer. Measure for continuity to ground on the same wire you checked for voltage at the MAF and TPS.
Let me know if there is any.
I want to make sure the G-B wire is not shorted to ground. The computer and sensors need disconnected or you will get a false reading. Measure the ohms from the chasis ground to the G-B wire.
Plug the computer connectors in and check the voltages to the power feeds to the computer on page 1 an 2 of the PDF wiring digram. The W-R wires pins 12 and 13 in connector E6(A) and the B-G wire same connector pin 1 What are the voltages if you back probe these wires with the key on?
No I work a regular job and it got busy I can only follow up when there is nothing to do. Make a jumper wire and apply 12 volts to these W-R wires. Bring it from the battery or you could piggy back off of the B-G wire. See if the Check engine light comes on or if the truck starts? Let me know If you trace the W-R wire back it comes from the EFI main relay and goes through a couple of connectors. There may be an issue with them but lets by pass it for now and see if we can get it fired up.
Let me know
The efi main relay has to click on when the key is turned on. If you jumper pins 5 to 3 then the power is at the W-R wires correct. The connector to connectors in the harness may be corroded but if you jump the relay or manual close it and get power to the W-R wires the probably would rule out EB2 and IH1 and splice points I15 and I12. Pins 1 and 5 at the EFI main relay should be 12 volts with the key on. only pin 2 should be Grounded. Does yours match this?
Clarify which pin is hot based on the image below.
Number 1 has to be hot (12 volts) from the IGN 7.5 amp fuse for the relay to engage. Do you have 12 volts at pin 1 of the efi main relay? If you jump only 5 to 3 will the check engine light come on and the truck start and run normal?
Yes it is Black with a yellow stripe. Depending on if it has 2 or 4 wheel ABS there is a connector that could be an issue. Click the link below for those locations. TRIPLE check the 7.5 amp IG fuse make sure the spades are tight in the fuse box. The B-Y wire runs in the main harness back to the fuse box in the drivers side that is where the IGN fuse is.
The download has both the V6 and the 4 cylinder wire harness routing and connector to connector locations. EB2 is the one you are looking for if it is a 2 wheel abs system. The connection is the only one between the 7.5 amp fuse and the efi main relay. As far as the exact way the individual wire goes there is no way to know. You will have to trace it down if it comes to that. My guess would be that it goes in on the right side by the computer then across the dash.
If you got the jumper wire providing the power that is not going to make any difference in the running of the engine verses the relay. Have you check the code system know that you have the check engine light working on the dash? Go back to the basics and check everything related to performance and running issues. Fuel pressure, timing vacuum, compression test spark out put tune up condition, and vacuum leaks.
I got you to the finish line you are going to have to finish it out there is not much more I can tell you double check everything you are missing something.