Injector wiring clarification

Cameron Shaw · 01-30-2025, 11:17 AM

I have a 1993 WRX (JDM) On the factory wiring diagram the ECU pin-outs for the injectors are labeled #1 B44 13, #2 B44 12, #3 B44 11, #4 B44 26. Does #1 #2 #3 #4 refer to Firing order or cylinder number. I believe that on the wiring diagram for the coils, these numbers refer to firing order. Thanks, Cameron

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Elbert Bass · 01-30-2025, 03:30 PM

Quote:

Originally Posted by Cameron Shaw

I have a 1993 WRX (JDM) On the factory wiring diagram the ECU pin-outs for the injectors are labeled #1 B44 13, #2 B44 12, #3 B44 11, #4 B44 26. Does #1 #2 #3 #4 refer to Firing order or cylinder number. I believe that on the wiring diagram for the coils, these numbers refer to firing order. Thanks, Cameron

INDUSTRY STANDARD for wiring or location identification is positional number not firing order.
Right and left is based on the view sitting in the driver seat.
Identification of #1 cylinder is the front of the engine for inline engines, and the furthest towards the front for V or horizontally opposed engines. V or horizontally opposed engines generally have all odd cylinders on one side - even on the other.

bo2o · 01-30-2025, 07:11 PM

I'd say those numbers are referring to the cylinder positions, not the firing order. So, #1 is usually the front cylinder. On V or boxer engines, odd cylinders are on one side, even on the other. The firing order's a different beast entirely.

TurboRev · 01-30-2025, 07:25 PM

The numbers on your injector wiring (B44 13, B44 12, etc.) refer to the cylinder positions (1, 2, 3, 4), not the firing order. For Subaru boxer engines, cylinder #1 is at the front-left, #2 is front-right, #3 is rear-left, and #4 is rear-right. The firing order (1-3-2-4) is separate from this and only affects the coils.

hani · 01-31-2025, 11:17 AM

Front left only if you are standing in front of the car, but as stated above, industry standard is when viewed from sitting in the driver's seat. So from there #1 would be front right. Also not all V engines are odd on one bank and even on the other, Honda and Ford number them in sequence very often. 1 2 3 being one bank 4 5 6 being the other.

Cameron Shaw · 01-31-2025, 01:23 PM

Thanks folks, but am I right that coil trigger pins-outs on the ECU are as follows: B44 10 Cylinder 1
B44 8 Cylinder 2
B44 9 Cylinder 3
B44 7 Cylinder 4
Thanks again

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01-30-2025, 11:17 AM	#1
Cameron Shaw Scooby Newbie Member#: 475207 Join Date: Sep 2017	Injector wiring clarification I have a 1993 WRX (JDM) On the factory wiring diagram the ECU pin-outs for the injectors are labeled #1 B44 13, #2 B44 12, #3 B44 11, #4 B44 26. Does #1 #2 #3 #4 refer to Firing order or cylinder number. I believe that on the wiring diagram for the coils, these numbers refer to firing order. Thanks, Cameron * Registered users of the site do not see these ads.

01-30-2025, 07:11 PM	#3
bo2o * Banned * Member#: 167238 Join Date: Dec 2007	I'd say those numbers are referring to the cylinder positions, not the firing order. So, #1 is usually the front cylinder. On V or boxer engines, odd cylinders are on one side, even on the other. The firing order's a different beast entirely.

01-30-2025, 07:25 PM	#4
TurboRev Scooby Newbie Member#: 463945 Join Date: Mar 2017	The numbers on your injector wiring (B44 13, B44 12, etc.) refer to the cylinder positions (1, 2, 3, 4), not the firing order. For Subaru boxer engines, cylinder #1 is at the front-left, #2 is front-right, #3 is rear-left, and #4 is rear-right. The firing order (1-3-2-4) is separate from this and only affects the coils.

01-31-2025, 11:17 AM	#5
hani Scooby Newbie Member#: 351181 Join Date: Mar 2013 Location: SLC Vehicle: 2007 STi Limited UGM	Front left only if you are standing in front of the car, but as stated above, industry standard is when viewed from sitting in the driver's seat. So from there #1 would be front right. Also not all V engines are odd on one bank and even on the other, Honda and Ford number them in sequence very often. 1 2 3 being one bank 4 5 6 being the other.

01-31-2025, 01:23 PM	#6
Cameron Shaw Scooby Newbie Member#: 475207 Join Date: Sep 2017	Thanks folks, but am I right that coil trigger pins-outs on the ECU are as follows: B44 10 Cylinder 1 B44 8 Cylinder 2 B44 9 Cylinder 3 B44 7 Cylinder 4 Thanks again