ABS code C1103

Tiny
JIM JACKSON2
  • MEMBER
  • 2007 NISSAN 350Z
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
My ABS, TRAC Off, and SLIP light are all on. I ran codes and found code C1103 FR RH Sensor-1. So I ordered a new wheel speed sensor and put it on. I cleared the code and went for a drive. The code was still there and lights never went away. I tested both the new and old wheel speed sensor using the 2CarPros guide "How to Test a Wheel Speed Sensor in Under 15 Minutes" I got no voltage reading on wither. Then I decided to try the test on one of the know working speed sensors. I got no voltage reading on that sensor either. I'm not sure what I can be doing wrong. I have read and reread the guide several times and even bought a new multi-meter. I'm not sure what to try next since this test hasn't given me a definitive answer as to if the wheel speed sensors are actually faulty or not.
Wednesday, November 6th, 2019 AT 11:06 PM

7 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Unfortunately your sensors are what are called active sensors so that way of checking the sensor would not work. I attached the diag for this code for you to run through. If you replaced the sensor already then you either have a wiring issue or the ABS control unit is the issue. Following this test will point you to the correct issue.

Let me know if you have questions when going through it.
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Thursday, November 7th, 2019 AT 4:45 PM
Tiny
JIM JACKSON2
  • MEMBER
  • 21 POSTS
Thank you for the quick reply and helpful information. I have tested the continuity from the ABS unit connection to the wire harness that connects to the speed sensor. I am getting no continuity on either wire. I just don’t know how to figure where the breakdown is. Any helpful tips in that area?
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Thursday, November 7th, 2019 AT 11:04 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay. I would just run your own new wire. Cut it at both ends about 5 inches from the connectors on both ends and run a new wire. Then just secure it so it doesn't get damaged. Automotive wiring is routed in a lot of tight spaces and trying to find the actual spot that is shorted or broken is very difficult. The best way to do it is trace the wire and look at obvious places that it could rub. If you don't find any then you need to remove the harness and inspect each inch of it.

I attached a diagram showing what I am talking about by cutting and running wires.
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Friday, November 8th, 2019 AT 5:55 PM
Tiny
JIM JACKSON2
  • MEMBER
  • 21 POSTS
This is exactly what I was going to ask next. I just wanted to make sure I wasn’t going to bypass any fuses by running new wire.

Based on the diagram you shared and the ones I’ve looked at I don’t think I would be bypassing anything.

I have the entire engine compartment pulled apart and the wires run in the main harness making it difficult to look at them.

I will be running new wires tomorrow and report back the results.

Thank you so much for your help!
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Friday, November 8th, 2019 AT 10:52 PM
Tiny
KASEKENNY
  • MECHANIC
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You are welcome. Please let me know if you have any questions. Thanks
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Saturday, November 9th, 2019 AT 6:31 PM
Tiny
JIM JACKSON2
  • MEMBER
  • 21 POSTS
Well, I ran two new wires from the sensor harness to the ABS unit. Would you believe when I turned it on, erased the codes and and pulled new codes it came back clear? Worked perfectly! Thank you so much for the help!
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Saturday, November 9th, 2019 AT 9:26 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Awesome. You had me nervous while I was reading that but so glad it worked out. Please come back in the future. Thanks
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Sunday, November 10th, 2019 AT 6:56 PM

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