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Old 06-06-2021, 04:30 PM #1
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C1406 code - simple remedies not working
Okay 4Runner friends, I need some assistance.

I have the ABS, 4WD, and slip lights on the dash. The 4WD light is flashing. ABS and slip are constant.

I searched the forum and saw a discussion on ABS, 4WD, and slip indicator lights discussion. I havenÂ’t done a lift. I didnÂ’t replace lights with LEDs.

I have:
Changed the gas cap,
Replaced the whee speed indicators on LF and RF, and
Replaced the LF ABS wiring harness.

The OBD code I get is C1406, which is “open or short in front speed sensor LH circuit.”

Any ideas?
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Old 06-06-2021, 04:32 PM #2
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Added info
It’s a 2010 SR5.
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Old 06-06-2021, 11:05 PM #3
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Quote:
Originally Posted by inrebuttal2u View Post
Okay 4Runner friends, I need some assistance.

I have the ABS, 4WD, and slip lights on the dash. The 4WD light is flashing. ABS and slip are constant.

I searched the forum and saw a discussion on ABS, 4WD, and slip indicator lights discussion. I havenÂ’t done a lift. I didnÂ’t replace lights with LEDs.

I have:
Changed the gas cap,
Replaced the whee speed indicators on LF and RF, and
Replaced the LF ABS wiring harness.

The OBD code I get is C1406, which is “open or short in front speed sensor LH circuit.”

Any ideas?
C1406 TOYOTA Open Or Short In Front Speed Sensor Left Circuit (With Video)

Most likely the ABS speed sensor on the front left wheel is bad, or the connector is not making good contact. Have you replaced that sensor?
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Old 06-07-2021, 12:54 PM #4
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Quote:
Originally Posted by inrebuttal2u View Post
Okay 4Runner friends, I need some assistance.

I have the ABS, 4WD, and slip lights on the dash. The 4WD light is flashing. ABS and slip are constant.

I searched the forum and saw a discussion on ABS, 4WD, and slip indicator lights discussion. I havenÂ’t done a lift. I didnÂ’t replace lights with LEDs.

I have:
Changed the gas cap,
Replaced the whee speed indicators on LF and RF, and
Replaced the LF ABS wiring harness.

The OBD code I get is C1406, which is “open or short in front speed sensor LH circuit.”

Any ideas?

Have you done a zero point calibration?


Yaw Rate and Acceleration Sensor Zero Point Calibration
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Old 06-07-2021, 05:51 PM #5
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Why not do a continuity test on the wires and confirm the message?
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Old 06-07-2021, 11:10 PM #6
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Rat stopped by for a quick snack, follow the harness and look for open in the harness.
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Old 06-10-2021, 11:31 PM #7
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Quote:
Originally Posted by fkheath View Post
C1406 TOYOTA Open Or Short In Front Speed Sensor Left Circuit (With Video)

Most likely the ABS speed sensor on the front left wheel is bad, or the connector is not making good contact. Have you replaced that sensor?

I replaced the wheel speed sensor and the wiring harness on that side, and the wheel speed sensor on the RH side, too.
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Old 06-10-2021, 11:34 PM #8
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Quote:
Originally Posted by comtn4x4 View Post
Have you done a zero point calibration?


Yaw Rate and Acceleration Sensor Zero Point Calibration
I have not. I’ve watched the videos on YouTube, but they’re all for prior gens.
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Old 06-10-2021, 11:35 PM #9
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Quote:
Originally Posted by EddieV4runnin View Post
Rat stopped by for a quick snack, follow the harness and look for open in the harness.
I replaced the harness. No hungry rats found.
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Old 06-10-2021, 11:37 PM #10
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Quote:
Originally Posted by comtn4x4 View Post
Have you done a zero point calibration?


Yaw Rate and Acceleration Sensor Zero Point Calibration
I guess this is my tomorrow project, now.
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Old 06-12-2021, 07:30 PM #11
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Calibration completed. It did not clear the lights.
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Old 06-15-2021, 06:13 PM #12
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To recap, I tried these things:
1) changing the gas cap (did not work),
2) changed LH and RH front wheel speed sensors (did not work),
3) changed LH wiring harness (did not work), and
4) completed zero point calibration (did not work).

I ended up punting it to the repair shop. According to the shop - deeper in the engine was a broken wire that controls the LH ABS.



So, there ya go, fellow 4Runners. The fix - relatively cheap. The diagnostics - 2 shop hours.
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Old 05-05-2023, 09:45 PM #13
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I had code c1406 and c1414. Replaced the sensor and wire and got rid of the c1406 code but not c1414.

After replacing the sensor and wire I did a road test and the ABS went crazy as soon as I hit the pedal and the code came back right away (after clearing with scanner).


Turns out my LF bearing was so bad that the speed signal got corrupted and threw the c1414 code.

Local shop struggled quite a bit to release old bearing and install new but issue is now fixed.
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