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No starter engagement, no spark, no fuel pressure

Tiny
DAMAN2020
  • MEMBER
  • 1999 LEXUS GS 300
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
While removing the crank pulley bolt, using the starter to break it lose, the exposed coil connector wire sparked to ground and disabled the starter and other inputs or outputs. I have straight wired the starter. It works but no spark, nothing happens when I turn the key to start.
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Saturday, April 4th, 2020 AT 5:30 PM

51 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

I attached a pic below from the wiring schematic. I need you to check for power to the black/white wire going to the igniter. Also, what other thing were affected? You mentioned input / output devices. Also, how have you straight wired the starter? In other words, what was bypassed to power the starter?

I noted you are a mechanic. Take a look at the schematic I attached and check for power from the ignition switch. Make sure the ignition fuse in pic didn't blow and there is power to it.

Let me know what you find.

Let me know.
Joe
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Saturday, April 4th, 2020 AT 6:05 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I suspect you have an issue with the crank sensor. Do you happen to have a scan tool that can look at live data? If so, can you crank the engine with the starter and see if the PCM registers an RPM?

If this is not the case, can you give me a little more detail about what arced and where it arced too? Are you saying an ignition coil or the starter B+ wire arced? I am just not sure which exposed wire you are talking about. Thanks
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Saturday, April 4th, 2020 AT 6:06 PM
Tiny
DAMAN2020
  • MEMBER
  • 43 POSTS
I have bookmarked the factory repair manual 1111 pages on this vehicle listed above. The arc came from the connector white for the coil. 2 wires black and white. The housing crumbled when being removed. So I had the metal ends laying on top of the valve cover when the ignition key was turned to engaged the starter. Arced once and no more starter. I've already purchased an ECU to replace the original. Still no start no changes. As far as the crank position sensor, I didn't touch it other than unplugging it. I perform a head gasket replacement and had the head straightened and tested.
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Saturday, April 4th, 2020 AT 7:07 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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All ignition fuses are good and have power? I have to be honest. Based on what you first posted, I though ECU as well.

If you have the manual, then you have the powertrain management schematic, correct?

Joe
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Saturday, April 4th, 2020 AT 7:23 PM
Tiny
DAMAN2020
  • MEMBER
  • 43 POSTS
Yes, I have all the information. There is no power to the ignition 5 amp fuse.
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Saturday, April 4th, 2020 AT 7:31 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Okay, lets work backwards. You replaced the ECM. Is there power to the black/white wire in connector E6? Also, there should be battery power at the black/yellow wire in the same connector. Looking at the connector I mentioned, the power supply is coming from a 25 amp inj fuse.
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Saturday, April 4th, 2020 AT 7:42 PM
Tiny
DAMAN2020
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  • 43 POSTS
Oh, I also found a burnt fuse in the fuse bank in front of the car battery; the 15 app AM2 fuse. I just replaced it with a 10 amp. All I have at the moment.
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Saturday, April 4th, 2020 AT 7:43 PM
Tiny
DAMAN2020
  • MEMBER
  • 43 POSTS
Just a moment and I will open up the ECU Box and test E6.
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Saturday, April 4th, 2020 AT 7:45 PM
Tiny
JACOBANDNICKOLAS
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Okay, the Am2 is power to the ignition switch. It also powers the 5 amp ign fuse. Then it distributes to other components. I took a snap shot of the ign fuse (5 amp) and what it runs to.

Did the AM2 chance anything? Check to see if there is now power to the 5 amp ign fuse when the key is on.
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Saturday, April 4th, 2020 AT 7:53 PM
Tiny
DAMAN2020
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Yes, we have power to the 5 amp ignition. Fuse with key on.
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Saturday, April 4th, 2020 AT 8:05 PM
Tiny
DAMAN2020
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The starter is now engaging. I'm going to check for fuel.
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Saturday, April 4th, 2020 AT 8:07 PM
Tiny
JACOBANDNICKOLAS
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Let me know. There is an injection fuse as well. Check for spark, too.
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Saturday, April 4th, 2020 AT 8:10 PM
Tiny
DAMAN2020
  • MEMBER
  • 43 POSTS
Apparently no fuel or spark. I listened for the fuel pump. Nothing, then sprayed starting fluid in the air box. Nothing.
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Saturday, April 4th, 2020 AT 8:12 PM
Tiny
DAMAN2020
  • MEMBER
  • 43 POSTS
I've located a 25 amp EFI fuse in front of the battery box. Test good.
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Saturday, April 4th, 2020 AT 8:18 PM
Tiny
DAMAN2020
  • MEMBER
  • 43 POSTS
I did manage to see an orange spark.
Can't hear the fuel pump. Where is the relay?
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Saturday, April 4th, 2020 AT 8:43 PM
Tiny
JACOBANDNICKOLAS
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I just ran through 5 pages and can only find the injection relay. Take a look at the picture.

Please bear with me, using a computer to page through schematics takes forever.
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Saturday, April 4th, 2020 AT 8:58 PM
Tiny
DAMAN2020
  • MEMBER
  • 43 POSTS
No worries, I'm not in a hurry. Update E6 connector black/yellow and black/white. I found 2 black/yellow and no black/white. One of the black/yellow is like 14 gauge and the other is a step down like 12 gauge. The 14 had power key off. The 12 had no power.
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Saturday, April 4th, 2020 AT 9:09 PM
Tiny
DAMAN2020
  • MEMBER
  • 43 POSTS
Found the fuel pump relay, it looks good however I did not put power to it. Now the relay is controlled by a module in the left rear if the trunk. It is controlled by the ECU. Any suggestions?
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Saturday, April 4th, 2020 AT 9:19 PM
Tiny
JACOBANDNICKOLAS
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I attached two pics below. The first one is at the ECM, and yes it ties into the fuel pump control ECY you are referring to in the trunk. Power is supplied to the ECM via the EFI fuse. Signal is sent to the fuel pump ecu in the trunk. If you look at pic 2, it shows power distribution to the pump and power from the ECU. Check those two sets of wires for power in and out. Note, there is a white / black wire to ground. It's doubtful that anything is wrong with it, but make sure there is continuity to ground.
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Saturday, April 4th, 2020 AT 9:59 PM
Tiny
DAMAN2020
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  • 43 POSTS
Thanks, I'm heading that way to see what's up. Shop is in the back yard.
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Saturday, April 4th, 2020 AT 10:03 PM

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