DTC 27
TROUBLE CODE 27- FAULTY A.B.S. SENSOR (OPEN CIRCUIT OR INPUT VOLTAGE EXCESSIVE)-
DIAGNOSIS:
- Faulty A.B.S. sensor
- Faulty harness
- Faulty A.B.S. control module
TROUBLE SYMPTOM:
- A.B.S. does not operate.
NOTE: Trouble codes 21, 23, 25, and 27 will not be stored while vehicle is stationary and can't specify problem location. Drive vehicle first, perform diagnosis and read trouble code.
1. CHECK RESISTANCE OF A.B.S. SENSOR TO A.B.S. CONTROL MODULE SIDE.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. control module.
3) Measure resistance between A.B.S. control module connector terminals.
TROUBLE CODE / Connector & terminal:
21 / (P4) No.23 - No.21
23 / (P4) No.22 - No.4: AWD
23 / (P4) No.5 - No.4: FWD
25 / (P4) No.24 - No.26
27 / (P4) No.8 - No.9
Specified resistance: 0.8 - 1.3 kohms
4) Measure resistance between A.B.S. control module connector and body.
TROUBLE CODE / Connector & terminal:
21 / (P4) No.23 - body
23 / (P4) No.4 - body
25 / (P4) No.24 - body
27 / (P4) No.8 - body
Specified resistance: 1 Mohms, min.
5) Turn ignition switch ON.
6) Measure voltage between A.B.S. control module connector and body.
TROUBLE CODE / Connector & terminal:
21 / (P4) No.23 - body
23 / (P4) No.4 - body
25 / (P4) No.24 - body
27 / (P4) No.8 - body
Specified voltage: 0 V
2. CHECK INPUT SIGNAL OF A.B.S. SENSOR TO A.B.S. CONTROL MODULE SIDE.
1) Raise all four wheels of ground.
2) Turn ignition switch OFF.
3) Disconnect connector from A.B.S. control module.
4) Disconnect connector cover from connector.
(a) Remove screw from portion 01.
(b) Move rubber boot 02 back (toward harness).
(c) Slide cover 03 in direction shown by arrow and remove.
5) Connect connector to A.B.S. control module.
6) Connect the oscilloscope to the A.B.S. control module connector in accordance with trouble code.
7) Turn ignition switch ON.
8) Rotate wheels and measure voltage at specified frequency.
NOTE: When this inspection is completed, the A.B.S. control module sometimes stores the trouble code 29.
TROUBLE CODE / Connector & terminal:
21 / (P4) No.23 - No.21
23 / (P4) No.22 - No.4: AWD
23 / (P4) No.5 - No.4: FWD
25 / (P4) No.24 - No.26
27 / (P4) No.8 - No.9
Specified voltage: 0.12 - 1 V (When it is 20 Hz)
3. CHECK A.B.S. SENSOR MECHANICAL TROUBLE.
1) Dismount brake as outlined in manual to gain access to A.B.S. sensor and tone wheel for inspection.
2) Check pole piece and tone wheel for accumulation of foreign particles. If necessary, remove foreign particles and clean.
3) Check tone wheel teeth for cracks for deformities. If necessary, replace tone wheel (No. of teeth: 44) with a new one.
4) Check tone wheel for looseness.
Tightening torque:
10 - 16 Nm (1 - 1.6 kg-m, 7 - 12 ft-Ib.)
5) Measure tone wheel-to-pole piece gap over entire perimeter of the wheel.
If measurements check out "Not OK", adjust the gap using spacers (Part No. 26755AA000). If spacers cannot correct the gap, replace worn sensor or worn tone wheel.
6) Check hub runout.
Specifications 0.05 mm (0.0020 in)
4. CHECK RESISTANCE OF A.B.S. SENSOR.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. sensor.
3) Measure resistance between A.B.S. sensor connector terminals.
TROUBLE CODE / Connector & terminal:
21 / (B6) No.1 - No.2
23 / (B11) No.1 - No.2
25 / (P5) No.1 - No.2
27 / (P12) No.1 - No.2
Specified resistance: 0.8 - 1.3 kohms