Page 1641 of 2248
B: TROUBLE CODE (NONE: B)
—TROUBLE IN WARNING LIGHT DRIVE
CIRCUIT—
DIAGNOSIS:
Faulty harness
Faulty A.B.S. control module
TROUBLE SYMPTOM:
Warning light remains on.
Impossible to read trouble code.
Check trouble code while the hydraulic control unit
valve relay is removed.
Not OK
OK
Perform diagnostics in accordance with trouble
code.
Make sure warning light is off when the valve relay
and A.B.S. control module is removed.
OK
Not OK
Harness is shorted to body.
Repair harness/connector.
1. Check input voltage to A.B.S. control module
from A.B.S. warning light.
OK
Not OK
Repair harness/connector.
2. Check power supply to A.B.S. control module.
OK
Not OK
Repair harness/connector.
3. Check A.B.S. control module ground line.
OK
Not OK
Repair harness/connector.
Replace A.B.S. control module.
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7. Diagnostics Chart with Trouble Code
Page 1642 of 2248
B4M0579
B4M0240B
1. CHECK INPUT VOLTAGE TO A.B.S. CONTROL
MODULE FROM A.B.S. WARNING LIGHT.
1) Turn ignition switch OFF.
2) Disconnect connector from A.B.S. control module.
3) Turn ignition switch ON.
4) Measure voltage between A.B.S. control module con-
nector and body.
Connector & terminal / Specified voltage:
(P3) No. 29—Body / 10—12 V
B4M0241B
2. CHECK POWER SUPPLY TO A.B.S. CONTROL
MODULE.
1) Turn ignition switch ON.
2) Measure voltage between A.B.S. control module con-
nector and body.
Connector & terminal / Specified voltage:
(P3) No. 1—Body / 10—12 V
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7. Diagnostics Chart with Trouble Code
Page 1643 of 2248
B4M0242B
3. CHECK A.B.S. CONTROL MODULE GROUND LINE.
Measure resistance between A.B.S. control module and
body.
Connector & terminal / Specified resistance:
(P3) No. 10—body / 0Ω
(P3) No. 20—body / 0Ω
(P3) No. 34—body / 0Ω
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7. Diagnostics Chart with Trouble Code
Page 1644 of 2248
C: TROUBLE CODE 21, 23, 25 AND 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.
OK
Not OK
4. Check resistance of A.B.S. sensor.
Not OK OK
Replace A.B.S. sensor.
Repair harness/connector.
2. Check input signal of A.B.S. sensor to
A.B.S. control module side.
Not OK
OK
Replace A.B.S. control module.
3. Check A.B.S. sensor mechanical trouble.
OK
Not OK
Repair mechanical trouble.
Replace A.B.S. sensor.
NOTE:
When checking A.B.S. sensor, carefully bend or swing con-
nector and harness to check for improper contacts or open
circuits.
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7. Diagnostics Chart with Trouble Code
Page 1645 of 2248
B4M0583
B4M0584A
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 / (P3) No. 23—No. 21
23 / (P3) No. 22—No. 4
25 / (P3) No. 24—No. 26
27 / (P3) No. 8—No. 9
Specified resistance: 0.8—1.2 kΩ
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7. Diagnostics Chart with Trouble Code
Page 1646 of 2248

B4M0585A
4) Measure resistance between A.B.S. control module
connector and body.
TROUBLE CODE / Connector & terminal:
21 / (P3) No. 23—body
23 / (P3) No. 22—body
25 / (P3) No. 24—body
27 / (P3) No. 8—body
Specified resistance: 1 MΩ, min.
B4M0586A
5) Turn ignition switch ON.
6) Measure voltage between A.B.S. control module con-
nector and body.
TROUBLE CODE / Connector & terminal:
21 / (P3) No. 23—body
23 / (P3) No. 22—body
25 / (P3) No. 24—body
27 / (P3) No. 8—body
Specified voltage: 0 V
G4M0698
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
1.
(b) Move rubber boot
2back (toward harness).
(c) Slide cover
3in 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.
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7. Diagnostics Chart with Trouble Code
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B4M0711A
8) Rotate wheels and measure voltage at specified fre-
quency.
NOTE:
When this inspection is completed, the A.B.S. control mod-
ule sometimes stores the trouble code 29.
TROUBLE CODE / Connector & terminal:
21 / (P3) No. 23 (+)—No. 21 ( )
23 / (P3) No. 22 (+) — No. 4 ( )
25 / (P3) No. 24 (+) — No. 26 ( )
27 / (P3) No. 8 (+) — No. 9 ( )
Specified voltage: 0.12 — 1 V (When it is 20 Hz.)
G4M0700
G4M0701
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 N⋅m (1.0 — 1.6 kg-m, 7 — 12 ft-lb)
5) Measure tone wheel-to-pole piece gap over entire
perimeter of the wheel.
SpecificationsFront wheel Rear wheel
0.9—1.4 mm
(0.035—0.055 in)0.7—1.2 mm
(0.028—0.047 in)
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)
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7. Diagnostics Chart with Trouble Code
Page 1648 of 2248
B4M0248B
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 / (B15) No. 1—No. 2
25 / (P8) No. 1—No. 2
27 / (P9) No. 1—No. 2
Specified resistance: 0.8—1.2 kΩ
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7. Diagnostics Chart with Trouble Code