Code No. 11, 12, 13 and 14: ABS Sensor (Open Circuit or Short Circuit)

CIRCUIT OPERATION

A toothed ABS rotor generates a voltage pulse as it moves across the pickup field of each ABS sensor.

The amount of voltage generated at each wheel is determined by the clearance between the ABS rotor teeth and the ABS sensor, and by the speed of rotation.

The ABS sensors transmit the frequency of the voltage pulses and the amount of voltage generated by each pulse to the ABS electronic control unit (ABS-ECU).

The ABS hydraulic unit modulates the amount of braking force individually applied to each wheel cylinder.

DIAGNOSIS CODE SET CONDITIONS

Diagnosis codes No. 11, 12, 13 and 14 are output when signal is not input due to breakage of the wires of the four ABS sensors.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THESE DIAGNOSIS CODES ARE TO SET ARE:)

Malfunction of the ABS sensor

Damaged wiring harness or connector

Malfunction of the hydraulic unit (integrated with ABS-ECU)

DIAGNOSIS

STEP 1. MUT-II/III data list.

Set MUT-II/III to data reading mode, and check the data list items by driving the vehicle.

Item 01: Front right ABS sensor

Item 02: Front left ABS sensor

Item 03: Rear right ABS sensor

Item 04: Rear left ABS sensor

OK: The reading on the speedometer nearly matches the indication on MUT-II/III, when driving.

Q: Is the ABS sensor input normal?

YES: This malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope With Intermittent Malfunction

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NO: Go to Step 2

STEP 2. Inspect the ABS sensor.

Refer to

Check items:

ABS sensor internal resistance: 1.24 - 1.64 kΩ

Insulation between the ABS sensor body and the connector terminals

Q: Is the ABS sensor damaged?

YES: Replace it and then go to Step 8

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NO: Go to Step 3

STEP 3. Measure the resistance at the ABS-ECU connector B-03.

Disconnect the connector B-03 and measure at the harness side.

Measure the resistance between the ABS-ECU connector terminals 16 and 26, 9 and 10, 11 and 17, or 27 and 28.

Standard Value: 1.24 - 1.64 kΩ

Q: Is the resistance between terminals 16 and 26, 9 and 10, 27 and 28, or 11 and 17 within the standard value?

When resistances between all terminals are within the standard value.: Erase the diagnosis code memory, and recheck if any diagnosis code sets. If diagnosis code No. 11, 12, 13 or 14 sets, replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 8

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When resistance between terminals 16 and 26 is not within the standard value.: Go to Step 4

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When resistance between terminals 9 and 10 is not within the standard value.: Go to Step 5

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When resistance between terminals 27 and 28 is not within the standard value.: Go to Step 6

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When resistance between terminals 11 and 17 is not within the standard value.: Go to Step 7

STEP 4. Check the harness wires between ABS-ECU connector B-03 (terminals 16 and 26) and ABS sensor <front: LH> connector A-13 (terminals 1 and 2).

NOTE: After inspecting ABS-ECU connector B-03, intermediate connector A-14 and ABS sensor <front: LH> connector A-13, inspect the wire. If ABS-ECU connector B-03, intermediate connector A-14 and ABS sensor <front: LH> connector A-13 are damaged, repair or replace them. Then go to Step 8

Q: Is the harness wire between ABS-ECU connector B-03 (terminals 16 and 26) and ABS sensor <front: LH> connector A-13 (terminals 1 and 2) damaged?

YES: Repair it and go to Step 8

.
NO: Go to Step 8

STEP 5. Check the harness wires between ABS-ECU connector B-03 (terminals 10 and 9) and ABS sensor <front: RH> connector A-30 (terminals 1 and 2).

NOTE: After inspecting ABS-ECU connector B-03, intermediate connector C-14, C-104 and ABS sensor <front: RH> connector A-30, inspect the wire. If ABS-ECU connector B-03, intermediate connector C-14, C-104 and ABS sensor <front: RH> connector A-30 are damaged, repair or replace them. Then go to Step 8

Q: Is the harness wire between ABS-ECU connector B-03 (terminals 10 and 9) and ABS sensor <front: RH> connector A-30 (terminals 1 and 2) damaged?

YES: Repair it and go to Step 8

.
NO: Go to Step 8

STEP 6. Check the harness wires between ABS-ECU connector B-03 (terminals 28 and 27) and ABS sensor <rear: LH> connector D-21 (terminals 1 and 2).

NOTE: After inspecting ABS-ECU connector B-03, intermediate connector C-104, C-117, D-22 and ABS sensor <rear: LH> connector D-21, inspect the wire. If ABS-ECU connector B-03, intermediate connector C-104, C-117, D-22 and ABS sensor <rear: LH> connector D-21 are damaged, repair or replace them. Then go to Step 8

Q: Is the harness wire between ABS-ECU connector B-03 (terminals 28 and 27) and ABS sensor <rear: LH> connector D-21 (terminals 1 and 2) damaged?

YES: Repair it and then go to Step 8

.
NO: Go to Step 8

STEP 7. Check the harness wires between ABS-ECU connector B-03 (terminals 11 and 17) and ABS sensor <rear: RH> connector D-12 (terminals 1 and 2).

NOTE: After inspecting ABS-ECU connector B-03, intermediate connector C-104, C-117, D-22 and ABS sensor <rear: RH> connector D-12, inspect the wire. If ABS-ECU connector B-03, intermediate connector C-104, C-117, D-22 and ABS sensor <rear: RH> connector D-12 are damaged, repair or replace them. Then go to Step 8

Q: Is the harness wire between ABS-ECU connector B-03 (terminals 11 and 17) and ABS sensor <rear: RH> connector D-12 (terminals 1 and 2) damaged?

YES: Repair it and then go to Step 8

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NO: Go to Step 8

STEP 8. Check whether the diagnosis code is reset.

Q: Is diagnosis code No. 11, 12, 13 or 14 output?

YES: Go to Step 1

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NO: The procedure is complete.


Code No. 11, 12, 13 and 14: ABS Sensor (Open Circuit or Short Circuit)

CIRCUIT OPERATION A toothed ABS rotor generates a voltage pulse as it moves across the pickup field of each ABS sensor. The amount of voltage generated at each wheel is determined by the clearance between the ABS rotor teeth and the ABS sensor, and by the speed of rotation. The ABS sensors transmit the frequency of the voltage pulses and the amount of voltage generated by each pulse to the ABS electronic control unit (ABS-ECU). The ABS hydraulic unit modulates the amount of braking force individually applied to each wheel cylinder.
DIAGNOSIS CODE SET CONDITIONS Diagnosis codes No. 11, 12, 13 and 14 are output when signal is not input due to breakage of the wires of the four ABS sensors.
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THESE DIAGNOSIS CODES ARE TO SET ARE:) Malfunction of the ABS sensor Damaged wiring harness or connector Malfunction of the hydraulic unit (integrated with ABS-ECU)
	DIAGNOSIS

	STEP 1. MUT-II/III data list. Set MUT-II/III to data reading mode, and check the data list items by driving the vehicle. Item 01: Front right ABS sensor Item 02: Front left ABS sensor Item 03: Rear right ABS sensor Item 04: Rear left ABS sensor OK: The reading on the speedometer nearly matches the indication on MUT-II/III, when driving. Q: Is the ABS sensor input normal? YES: This malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope With Intermittent Malfunction . NO: Go to Step 2.
	STEP 2. Inspect the ABS sensor. Refer to . Check items: ABS sensor internal resistance: 1.24 - 1.64 kΩ Insulation between the ABS sensor body and the connector terminals Q: Is the ABS sensor damaged? YES: Replace it and then go to Step 8. NO: Go to Step 3.
	STEP 3. Measure the resistance at the ABS-ECU connector B-03. Disconnect the connector B-03 and measure at the harness side. Measure the resistance between the ABS-ECU connector terminals 16 and 26, 9 and 10, 11 and 17, or 27 and 28. Standard Value: 1.24 - 1.64 kΩ Q: Is the resistance between terminals 16 and 26, 9 and 10, 27 and 28, or 11 and 17 within the standard value? When resistances between all terminals are within the standard value.: Erase the diagnosis code memory, and recheck if any diagnosis code sets. If diagnosis code No. 11, 12, 13 or 14 sets, replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 8 . When resistance between terminals 16 and 26 is not within the standard value.: Go to Step 4. When resistance between terminals 9 and 10 is not within the standard value.: Go to Step 5. When resistance between terminals 27 and 28 is not within the standard value.: Go to Step 6. When resistance between terminals 11 and 17 is not within the standard value.: Go to Step 7.
	STEP 4. Check the harness wires between ABS-ECU connector B-03 (terminals 16 and 26) and ABS sensor <front: LH> connector A-13 (terminals 1 and 2). NOTE: After inspecting ABS-ECU connector B-03, intermediate connector A-14 and ABS sensor <front: LH> connector A-13, inspect the wire. If ABS-ECU connector B-03, intermediate connector A-14 and ABS sensor <front: LH> connector A-13 are damaged, repair or replace them. Then go to Step 8 . Q: Is the harness wire between ABS-ECU connector B-03 (terminals 16 and 26) and ABS sensor <front: LH> connector A-13 (terminals 1 and 2) damaged? YES: Repair it and go to Step 8. NO: Go to Step 8.
	STEP 5. Check the harness wires between ABS-ECU connector B-03 (terminals 10 and 9) and ABS sensor <front: RH> connector A-30 (terminals 1 and 2). NOTE: After inspecting ABS-ECU connector B-03, intermediate connector C-14, C-104 and ABS sensor <front: RH> connector A-30, inspect the wire. If ABS-ECU connector B-03, intermediate connector C-14, C-104 and ABS sensor <front: RH> connector A-30 are damaged, repair or replace them. Then go to Step 8 . Q: Is the harness wire between ABS-ECU connector B-03 (terminals 10 and 9) and ABS sensor <front: RH> connector A-30 (terminals 1 and 2) damaged? YES: Repair it and go to Step 8. NO: Go to Step 8.
	STEP 6. Check the harness wires between ABS-ECU connector B-03 (terminals 28 and 27) and ABS sensor <rear: LH> connector D-21 (terminals 1 and 2). NOTE: After inspecting ABS-ECU connector B-03, intermediate connector C-104, C-117, D-22 and ABS sensor <rear: LH> connector D-21, inspect the wire. If ABS-ECU connector B-03, intermediate connector C-104, C-117, D-22 and ABS sensor <rear: LH> connector D-21 are damaged, repair or replace them. Then go to Step 8 . Q: Is the harness wire between ABS-ECU connector B-03 (terminals 28 and 27) and ABS sensor <rear: LH> connector D-21 (terminals 1 and 2) damaged? YES: Repair it and then go to Step 8. NO: Go to Step 8.
	STEP 7. Check the harness wires between ABS-ECU connector B-03 (terminals 11 and 17) and ABS sensor <rear: RH> connector D-12 (terminals 1 and 2). NOTE: After inspecting ABS-ECU connector B-03, intermediate connector C-104, C-117, D-22 and ABS sensor <rear: RH> connector D-12, inspect the wire. If ABS-ECU connector B-03, intermediate connector C-104, C-117, D-22 and ABS sensor <rear: RH> connector D-12 are damaged, repair or replace them. Then go to Step 8 . Q: Is the harness wire between ABS-ECU connector B-03 (terminals 11 and 17) and ABS sensor <rear: RH> connector D-12 (terminals 1 and 2) damaged? YES: Repair it and then go to Step 8. NO: Go to Step 8.
	STEP 8. Check whether the diagnosis code is reset. Q: Is diagnosis code No. 11, 12, 13 or 14 output? YES: Go to Step 1 . NO: The procedure is complete.