Ford Ranger IV 2020 - No OBD connection

[airline tech]

Yours should be similar as this is for a 2.3 Ranger


We need to pinpoint - is the BCM or PCM - preventing the No Start Issue

We know that the switch is getting power (flashing)
but we do not know if the BCM and PCM are communicating together that a start request or ISP-R (Ignition Switch Position - Run) is being transmitted.

FYI - Fuse 84 - Starter Relay Fuse - Is on the bottom side of the BJB - there is 2 sides to that fuse box.

Note: The PCM provides the Coil Power as well as Coil Ground

So with a helper - pull the starter relay and check - when the PB is pressed to start are you getting power on Pin 2 (Relay Removed)

You could also check for power at pin 3 and even (Jumper Pin 3 to Pin 5) just to see if it will crank - just keep in mind that the normal starter engage and release is only a few seconds (the ranger starts fast) and the ground (SMCS) Starter Motor Control Sense is removed at approximately 400 RPM (the PCM is monitoring) engine RPM at start-up

Keep in mind that it may not start - as the PCM may not be providing Ignition etc, but at least this will get a (Crank Test) completed

Check Fuse 28

The BCM sends the signal to wake the PCM this sends the Ground to the PCM Power Relay - the ISP-R circuit is the input into the PCM that the ignition switch has changed from off to Run or Start and this data is transmitted throughout all modules via the Can Busses

Note: The ISP-R - circuit powers from the Run Start Relay
Note: The PCM provides the Ground for the PCM Power Relay (Coil) and the BCM is what tells the PCM its ok (authorizes) that to happen

So just a few things to check - moving forward

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[rokas]

Double checked all the wires going to the PCM according to the wiring diagram. CAN lines show 2.5V, power and ground wires are ok too. Pins 59, 60 get 12V too.

Took out the PCM and it has damage. I don't have the hardware required to bench test it, but I plan to take it to someone who could do this.

 

[rokas]

These are the wires that were cut at the back of the truck. It was me who stripped the wires. The other connector was cut too, but from the other end, so I simply disconnected it.

 

[rokas]

One more thing: the drive mode on the dashboard shows N. Turning the knob does nothing.

I used the same ELM obd adapter and it failed to communicate with engine ecu. It show the VIN, but it says that it got it from OBD-II module, which I think is GWM (?).

 

[XRANGER2019]

Hey,

I’ve got a 2020 Ford Ranger and I’m troubleshooting a CAN/OBD issue.
At the OBD port, pins 6 and 14 show close to 0 V, and I measure about 120 Ω resistance between them.
I started digging by disconnecting the SDLC module and checking continuity with a multimeter. I found continuity between SDLC pins 4 & 5 and OBD pins 6 & 14.

However, what confuses me is this: on my truck, the SDLC connector does not seem to have wires in positions 2–5 at all — only pins 6 & 7 on the first row are populated. Mine is a left-hand-drive Ranger.

If there are physically no wires in the SDLC positions that should correspond to OBD pins 6 and 14, how can OBD pins 6 and 14 still have continuity / a CAN connection? Is there a different routing on LHD Rangers, or am I misunderstanding the wiring diagram?

SDLC wiring diagram attached.

One more thing to add. I bought this truck after accident. Truck does not start and I have no history of it.

Any help would be much appreciated!

Check the fuse

 

[rokas]

@XRANGER2019 which fuse do you have in mind?

 

[rokas]

Yours should be similar as this is for a 2.3 Ranger


We need to pinpoint - is the BCM or PCM - preventing the No Start Issue

We know that the switch is getting power (flashing)
but we do not know if the BCM and PCM are communicating together that a start request or ISP-R (Ignition Switch Position - Run) is being transmitted.

FYI - Fuse 84 - Starter Relay Fuse - Is on the bottom side of the BJB - there is 2 sides to that fuse box.

Note: The PCM provides the Coil Power as well as Coil Ground

So with a helper - pull the starter relay and check - when the PB is pressed to start are you getting power on Pin 2 (Relay Removed)

You could also check for power at pin 3 and even (Jumper Pin 3 to Pin 5) just to see if it will crank - just keep in mind that the normal starter engage and release is only a few seconds (the ranger starts fast) and the ground (SMCS) Starter Motor Control Sense is removed at approximately 400 RPM (the PCM is monitoring) engine RPM at start-up

Keep in mind that it may not start - as the PCM may not be providing Ignition etc, but at least this will get a (Crank Test) completed

Check Fuse 28

The BCM sends the signal to wake the PCM this sends the Ground to the PCM Power Relay - the ISP-R circuit is the input into the PCM that the ignition switch has changed from off to Run or Start and this data is transmitted throughout all modules via the Can Busses

Note: The ISP-R - circuit powers from the Run Start Relay
Note: The PCM provides the Ground for the PCM Power Relay (Coil) and the BCM is what tells the PCM its ok (authorizes) that to happen

So just a few things to check - moving forward

I will do the checks.

OBD communicates with BCM since there are faults stored in this module. One thing, I do not see PIN 64 to be available on 2.0 EU diesel version.

 

[airline tech]

Most of what I am giving you - since I cannot see the ROW Ranger diagrams, you are going to need to find where the specific (pin) is located. The standard function should be the same, but the pinouts are going to be different as our PCM (Incorporates) the TCU (Transmission Control Unit) into a single module, yours is 2 separate modules.

You have power at 59 and 60 - What about the important ones - 100-102-103?

This is what powers the PCM and the relay must close for this power also note the fused power between the relay and PCM.

as far as the cut plug - both ends are cut and this feeds the TRM? 6-wires, I am also noting that it appears the (Can Bus) data lines are different that the US - (It Appears)

Note: You have access to something that we in the US - do not have easy access to - the ROW Ranger manuals and the important wiring diagrams for it.
Many (Online) sellers show - hey buy our manual for the info you want, only to be disappointed in the end as its generic data and not the true manual. (Frustrating)

So if you do not mind - where did you get the manual from, as I have tried various sources and left hanging.

 

[airline tech]

Basically-Back probe 100- 102- 103 , is the PCM Relay closing?

Are all the PCM Grounds - Good?
Can the PCM relay (coil) get a ground to close and do the PCM power feeds in 100-102-103 have a path to ground.

 

[rokas]

Most of what I am giving you - since I cannot see the ROW Ranger diagrams, you are going to need to find where the specific (pin) is located. The standard function should be the same, but the pinouts are going to be different as our PCM (Incorporates) the TCU (Transmission Control Unit) into a single module, yours is 2 separate modules.

You have power at 59 and 60 - What about the important ones - 100-102-103?

This is what powers the PCM and the relay must close for this power also note the fused power between the relay and PCM.

as far as the cut plug - both ends are cut and this feeds the TRM? 6-wires, I am also noting that it appears the (Can Bus) data lines are different that the US - (It Appears)

Note: You have access to something that we in the US - do not have easy access to - the ROW Ranger manuals and the important wiring diagrams for it.
Many (Online) sellers show - hey buy our manual for the info you want, only to be disappointed in the end as its generic data and not the true manual. (Frustrating)

So if you do not mind - where did you get the manual from, as I have tried various sources and left hanging.

100-102-103 - all get 12V.

Regarding the manuals, I had the same question for you too. Each time I go to diagnose something, I buy it from https://www.fordserviceinfo.com/Home/EuropeanPricing. The good thing is that at least one hour actually lasts about 5 or 6 hours.

 

[rokas]

I turned the ignition on and then removed the connector from the PCM to check it with a multimeter. Everything checks out.

 

[RangerBill]

I turned the ignition on and then removed the connector from the PCM to check it with a multimeter. Everything checks out.

What exactly happens when you try to start it? Does it crank over, but not start or no crank?

I would concentrate on getting Forscan to work to get the DTC codes, since the port is working now.

 

[airline tech]

We in the US - use a (Single Use) Vehicle and have a subscription base - Month, Yearly etc
They run about $60.00 a year (USD) - Most Popular are Alldata DIY and Mitchel DIY
Some also buy the manual outright - Helm, which actually publishes the Ford Manuals or find copies (PDF) on Ebay etc - the US Version is easier as we only have (1) Engine the 2.3.

But the issue is - if you search Alldata etc - from a US Browser , you cannot find the ROW Rangers listed as I have also used Alldata - Full Access (Shop's Use) and anything that is overseas (we cannot see)
Even the Ford Services (US) - now it offers a 72-Hour use of the manuals and its cheap and you can download and save as needed - the good you have full access to all vehicle lines, the bad only US based vehicles, some Mexico based - but its very limited on the data that is in it.

So I see Lithuania has a different option (the only option) is the manual plus FDRS access and its expensive.

There is an option (that I may try) is sign into the Australia market - 72-Hour and if it will let me pay and access from a US Based Browser, then I can view and download the parts of the manual I have had difficulty finding. This also gives the option to view all engine variants. 2.0 - 2.2 - 3.2.
(Hopefully)

IDK, if it will let me - actually through, but I may try it, and its also an option for you as well to try, gives you a loner (use) and a cheaper price.

So, form a US Base, a simple google search for anything ROW based, provides next to nothing for specific information - this frustrates me.
Another is trying to search - ROW Rangers (For Sale) or (Salvage) - in the US it is commonplace to show the Window Sticker or VIN# of the vehicle (such as salvage yard) donor vehicle - all you get to view is a (Stock Number or Similar)

So it makes it more difficult trying to find manual (information) when they ask for a VIN#, and you do not have one to enter.

With that said:
The GWM you purchased - That white parts tag - does it list a VIN# on it - the truck it came from?

As far as your - No Start Issue:

I would focus and check - 2 things

The Starter Relay - Coil Power and Ground and can you get starter engagement via jumper
and
HS1 - Bus - activity (When the Start Button) is pressed does the voltage fluctuate (Bus Activity)

At this point we know we have power to the PCM, but we do not know if it is transmitting data and the issue appears to be on the HS1 Bus.

Hopefully you can eventually get a full com to help in pinpointing where the PCM is blocking the start request. its looking like a PATS issue and its security blocking the start.

One question - Did the Airbags Deploy?

 

[rokas]

What exactly happens when you try to start it? Does it crank over, but not start or no crank?

I would concentrate on getting Forscan to work to get the DTC codes, since the port is working now.

Nothing happens. Some relays click, but that's it.

 

[rokas]

We in the US - use a (Single Use) Vehicle and have a subscription base - Month, Yearly etc
They run about $60.00 a year (USD) - Most Popular are Alldata DIY and Mitchel DIY
Some also buy the manual outright - Helm, which actually publishes the Ford Manuals or find copies (PDF) on Ebay etc - the US Version is easier as we only have (1) Engine the 2.3.

But the issue is - if you search Alldata etc - from a US Browser , you cannot find the ROW Rangers listed as I have also used Alldata - Full Access (Shop's Use) and anything that is overseas (we cannot see)
Even the Ford Services (US) - now it offers a 72-Hour use of the manuals and its cheap and you can download and save as needed - the good you have full access to all vehicle lines, the bad only US based vehicles, some Mexico based - but its very limited on the data that is in it.

So I see Lithuania has a different option (the only option) is the manual plus FDRS access and its expensive.

There is an option (that I may try) is sign into the Australia market - 72-Hour and if it will let me pay and access from a US Based Browser, then I can view and download the parts of the manual I have had difficulty finding. This also gives the option to view all engine variants. 2.0 - 2.2 - 3.2.
(Hopefully)

IDK, if it will let me - actually through, but I may try it, and its also an option for you as well to try, gives you a loner (use) and a cheaper price.

So, form a US Base, a simple google search for anything ROW based, provides next to nothing for specific information - this frustrates me.
Another is trying to search - ROW Rangers (For Sale) or (Salvage) - in the US it is commonplace to show the Window Sticker or VIN# of the vehicle (such as salvage yard) donor vehicle - all you get to view is a (Stock Number or Similar)

So it makes it more difficult trying to find manual (information) when they ask for a VIN#, and you do not have one to enter.

With that said:
The GWM you purchased - That white parts tag - does it list a VIN# on it - the truck it came from?

As far as your - No Start Issue:

I would focus and check - 2 things

The Starter Relay - Coil Power and Ground and can you get starter engagement via jumper
and
HS1 - Bus - activity (When the Start Button) is pressed does the voltage fluctuate (Bus Activity)

At this point we know we have power to the PCM, but we do not know if it is transmitting data and the issue appears to be on the HS1 Bus.

Hopefully you can eventually get a full com to help in pinpointing where the PCM is blocking the start request. its looking like a PATS issue and its security blocking the start.

One question - Did the Airbags Deploy?

I have already returned the second hand GWM, but there was no VIN# on the tag.

Yes, airbags deployed.

I will open the PCM myself to check the board.

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