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OBD and OBD2, what fuse or fuses power the ports?

Tiny
GARYN77
  • MEMBER
  • 2008 MITSUBISHI LANCER
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
What fuse or fuses power the ports?
Sunday, September 17th, 2023 AT 11:38 AM

30 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Hi,

Pics 1 and 2 below are of the computer data lines. Pin 16 on the DLC is what should have power at all times. If it doesn't, check the fuse 5 on the ETACS ECU behind the rear of the junction box (left side of the dash).

I attached the wiring schematic so that you have a reference.

Let me know if this helps or if you have other questions.

Take care,

joe

See pics below. Note: Pic 4 is just to show the location of the ETACS.
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Sunday, September 17th, 2023 AT 9:38 PM
Tiny
GARYN77
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Replaced fuse 13 inside box. Voltage on pin 16 of DLC returned. Barrowed a small scan tool, not sure about what I got from it. Code was V0100. Said lost com with EEM/PCA A and also said ISO/SAE reversed. Maybe you can get something out of it or lead me the correct way.
Thanks,
GaryN77
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Thursday, September 21st, 2023 AT 3:58 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Hi Gary, could it be a U0100? There are no V codes. Also, I need to know which circuit was giving you trouble. A U0100 can be related to a few different areas. See pic below.

Let me know.

Take care,

Joe

See pic below.
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Thursday, September 21st, 2023 AT 7:05 PM
Tiny
GARYN77
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The code was U0100 as you thought. I got a new scanner yesterday and played with it for a while but the only thing I saw was the U0100 code and it showed "ECM lost comm with PCA A". Also said ISO and SAE reversed. I'm going to have to put some time with the scanner to be comfortable with it, it is a Zurich Model ZR13S OBD@ reader. The weather here in PA is going to be bad so I'll. Have time to learn. The car is outside and will not turn over now. I will keep in touch.
Thanks,
GaryN77
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Saturday, September 23rd, 2023 AT 6:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
On an automotive scan tool or diagnostic equipment, "ISO" and "SAE" reversed typically refer to the two primary communication protocols used in modern vehicles for onboard diagnostics and data exchange between the vehicle's electronic control modules and the diagnostic tool. These protocols are known as ISO 15765-4 and SAE J1979.

When you see "ISO and SAE reversed" on a car scan tool or diagnostic device, it likely means that the tool has the ability to switch between these two communication protocols, allowing it to work with a broader range of vehicles from different regions and manufacturers.

The U0100 trouble code indicates a communication problem between your vehicle's Engine Control Module (ECM) and the Powertrain Control Module A (PCA A). This code is typically associated with a network communication issue within the vehicle's onboard diagnostic system. If possible, let me know what system is causing issues so I can go into the diagnostics.

BTW, welcome to PA. I'm near Pittsburgh. LOL

Joe
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Saturday, September 23rd, 2023 AT 7:10 PM
Tiny
GARYN77
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  • 15 POSTS
Joe,
Today I ran the scanner the best I could by following the step-by-step directions. I got three faults. They are:

Global OBD2 3DTCs
:
U0100(1/3) Stored
1 Engine CAN Timeout
2 EV-ECU CAN Timeout
DTC Severity 2 of 3

P1773(3/3) Pending
1 LR/DIR Solenoid
2 ABS/ASC Information

U0100
1 Engine CAN Timeout
2 EV-ECU CAN Timeout

ABS 1DTC

U01100(1/1)Active
1 Engine CAN TIMEOUT
2 EV-ECU CAN Timeout

ABS/ASC/ASTC/WSS
U0100(1/1) Active
1 Engine CAN Timeout
2 EV-ECU CAN Timeout

I hope you can get something out of this. Let me know if I need to do more. I'm just learning about scanners. Thanks, GaryN77 I live in Tyrone, PA Between Altoona and State College.
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Wednesday, September 27th, 2023 AT 7:22 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

You're not too far. LOL

As far as the codes, the U0100 is of interest to me. However, I need to know which components you are having trouble with because it is tied to different circuits. See pic below. Let me know if you are having issues with the transmission, ABS, and so on.

Take care,

Joe

See pic below.
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Wednesday, September 27th, 2023 AT 8:28 PM
Tiny
GARYN77
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  • 15 POSTS
This started out as a parasitic drain problem causing the battery to go dead if the car sat for 4 days or more. Everything worked fine when I started. I got to look and check for current flow across fuses after the car sat a while and also check for open fuses. The first thing that happened was the coolant fan on the radiator started to run when you turned the key on. That problem stopped when I disconnected the battery for a while. Then the car would not start. The dash lights come on and stay on when the key is turned to start but the starter will not engage or make any noise. That is where I am today. Us old car mechs. Just don't have it to work on newer cars!
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Thursday, September 28th, 2023 AT 9:02 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

I attached the starter circuit wiring schematic below. Do you have power at all fuse and fusible links? Do you have power to the starter relay as well as a ground for the primary side of the relay?

Let me know.

Joe

See pics below.
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Thursday, September 28th, 2023 AT 8:26 PM
Tiny
GARYN77
  • MEMBER
  • 15 POSTS
First of all, I want to thank you all for your time, info and great materials. Like the great schematics and info sheets. The 12 volts is on the starter relay, pin 4, and pin 1 is grounded. You say to check all fusible links. I checked the ones related to the starter ckt and they are good. Do I need to check the ones related to ABS and other ckts?

Thanks again,
GaryN77
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Saturday, September 30th, 2023 AT 5:34 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Do you have power at pin 2 when the key is in the start position? That could be the issue.

Let me know.

Joe
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Saturday, September 30th, 2023 AT 9:53 PM
Tiny
GARYN77
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I measured at pin 2 of the starter relay with the relay out and got 1.7 volts when the key was at the start position or not. Let me know if I should have measured with the relay in the circuit.

Gary
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Sunday, October 1st, 2023 AT 11:54 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi Gary, you did it correctly. I think you found the problem. That pin is the power supply to the relay primary. 1.7v isn't enough to close the secondary side so there is a no crank condition.

Now we need to know why it isn't getting full power. If you follow the power supply from the relay (pin 2), it takes you to the transmission range sensor. Have you tried starting it in neutral or any other gear? I ask because the sensor itself may be faulty. If you have and there is no change, at the range sensor you will find a red wire with a white tracer. That is from the PCM which allows power to reach the relay's primary side when starting. I need you to check that wire for power. You can do it with the connector disconnected, but you will need a helper to turn the key for you. If we have power there, then reconnect the connector and back probe the black wire with a red tracer for power. If there is no change, replace the range sensor. If there is power, then we have a wiring problem between the range sensor and the relay.

Let me know if that makes sense.

Take care and let me know.

Joe

See pic below.
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Sunday, October 1st, 2023 AT 7:50 PM
Tiny
GARYN77
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  • 15 POSTS
Joe,

First of all, I did try to start the car in all gears, no good. We pulled the connector off the range sensor and measured 1.7 volts on the red wire with the white tracer. Same voltage as relay pin 2. Then we measured the black wire the best we could, not much room and much light there. Got zero volts both with connector on and off. If you think this is not good let me know and I will try to measure the black wire again. I looked around the local parts stores and found no one carries the range sensor. Called the local Mitsubishi dealer and he can get it in one day for $104.38. Going to look online. I did get part number though.

Thanks,
GaryN77
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Tuesday, October 3rd, 2023 AT 4:28 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Hi,

No to the range sensor. We need to determine why you are only getting 1.7V. At this point, I would check the power to the ECU. Power from fuse 14 goes to the ignition switch. In the start position, that power (B+) should go to the ECU via a light green wire. When power is sent, then you should get B+ out of the ECU to the range sensor and if it is in park or neutral, power then would travel to the relay primary. We need B+ to the range sensor red/white wire.

Check to see if the light green wire has B+ voltage when the key is in the start position. If it does, then check the red wire with the white tracer out of the ECU for B+ voltage. If you have 12v in and 1.7 out, the ECU is faulty.

Let me know.
Joe

See pics below.
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Tuesday, October 3rd, 2023 AT 7:26 PM
Tiny
GARYN77
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  • 15 POSTS
Hi,

I measured (B+) 12.2 volts on fuse #14 and measured 1.7 volts on the light green and red with white tracer wires. Wires measured at the input of the ECU. All were measured with shifter in park and the key turned to the start position. Looks like something is loading down the ECU or it's just failed.
Let me know what you think?

GaryN77
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Friday, October 6th, 2023 AT 12:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
If you are checking power at the input to the ECM, the ECM isn't the issue. We are losing power before it. Are you able to check at the ignition switch? There is an orange wire that changes to the light green one at the ETACS. We may be losing power at that point. Check it. If there is B+ voltage to the ETACS via the orange wire from the ignition switch. Let's first determine where the power is lost.

Let me know.

Joe
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Friday, October 6th, 2023 AT 8:25 PM
Tiny
GARYN77
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  • 15 POSTS
Joe,

Measured (B+) 12 volts on the orange wire but could not get anything on the light green wire. The voltage at the orange wire was measured with the ignition switch in the start position'. If this means the ETACS is bad, maybe I should recheck the light green wire again to be sure. I was using a needle to pierce. The insulation after partially disassembling the steering collum. My daughter was off today and helped me. I told her she can have all my tools when I pass.

Thanks again,
GaryN77
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Saturday, October 7th, 2023 AT 6:24 PM
Tiny
GARYN77
  • MEMBER
  • 15 POSTS
Joe,

One thing to check. The part number on the module I thought was the ETACS-ECU was:
8631A079. Do you have a way to check that?

GayN77
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Saturday, October 7th, 2023 AT 6:32 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Gary,

My manual normally would have that information, but for some reason, it doesn't on this vehicle.

While I was checking, I came across a technical service bulletin (TSB) explaining how a "new" one should be installed. I found that odd. Usually, where there is a change to direction, it is the result of an issue with the original one, but there are no additional TSBs that are relevant.

I attached that information below for you to take a look at. As far as the part number is concerned, you may need to confirm that with a dealer. Sorry about that.

Let me know.

Joe

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Saturday, October 7th, 2023 AT 9:37 PM

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