ABS With TCS Trouble Code Charts For Warning Light Codes

DIAGNOSIS
^ Faulty stroke sensor.
^ Faulty stop light switch.
^ Faulty pump unit in hydraulic unit.

TROUBLE SYMPTOM
^ ABS and Traction Control System (TCS) do not operate.
^ Only when the stop light switch circuit is broken, the ABS functions while TCS does not. (TCS warning light only illuminates.)

PROCEDURE
1. Check installation of stroke sensor.
a) Check that the stroke sensor is firmly installed without play.
b) Check that the stop lamp does not remain illuminated.

2. Check resistance of stroke sensor.
a) Turn ignition switch OFF.
b) Disconnect stroke sensor connectors.
c) Remove stroke sensor.





d) Measure resistance between stroke sensor terminals.
Terminal / Specified resistance:
No. 1 & No. 3 / 570 - 630 ohms

3. Check stroke sensor operation.
a) Turn ignition switch OFF.
b) Disconnect stroke sensor connectors.
c) Remove stroke sensor.





d) Measure the stroke sensor resistance against the rod stroke.





Terminal: No. 35 & No. 2

NOTE: Stroke = 0 when the stroke sensor rod is completely drawn into the sensor unit.

4. Check body short of stroke sensor.
a) Turn ignition switch OFF.
b) Disconnect stroke sensor connectors.
c) Remove stroke sensor.





d) Measure resistance between stroke sensor terminal and stroke sensor threads.
Terminal / Specified resistance:
No. 1 & stroke sensor threads / 1 M ohm
No. 2 & stroke sensor threads / 1 M ohm
No. 3 & stroke sensor threads / 1 M ohm

5. Check contact point of stop light switch.
a) Turn ignition switch OFF.
b) Disconnect stroke sensor connectors.
c) Remove stroke sensor.





d) Measure resistance between stroke sensor terminals.





Terminal: No. 2 & No. 3

NOTE: Stroke = 0 when the rod is completely drawn in.

6. Check body short of stop light switch.
a) Turn ignition switch OFF.
b) Disconnect stroke sensor connectors.
c) Remove stroke sensor.





d) Measure resistance between stroke sensor terminal and stroke sensor threads.
Terminal / Specified resistance:
No. 2 & stroke sensor threads / 1 M ohm
No. 3 & stroke sensor threads / 1 M ohm

7. Check power supply of stop light switch.
a) Turn ignition switch OFF.
b) Disconnect stroke sensor connector.





c) Measure voltage between stroke sensor connector and body.
Connector & terminal / Specified voltage:
(B67) No. 3 & body / 10-12 Volts

8. Check input voltage of ABS/TCS control module.
a) Turn ignition switch OFF.
b) Install stroke sensor.
c) Connect stroke sensor connector.
d) Disconnect ABS/TCS control module connector.





e) Measure voltage between ABS/TCS control module connector and body.
Connector & terminal / Specified voltage:
(P7) No. 7 & body / 10 - 12 Volts (With brake pedal depressed)
(P7) No. 7 & body / 0 Volts (Without brake pedal depressed)

9. Check stop light circuit.
a) Turn ignition switch OFF.
b) Install stroke sensor.
c) Connect stroke sensor connector.
d) Connect ABS/TCS control module connector.
e) Depress brake pedal and check that the stop light comes on.

10. Check harness between stroke sensor and ABS/TCS control module.
a) Turn ignition switch OFF.
b) Install stroke sensor.
c) Connect stroke sensor connector.
d) Disconnect ABS/TCS control module connector.





e) Measure resistance between ABS/TCS control module connector terminals.
Connector & terminal / Specified resistance
(P7) No. 4 & No. 14 / 570 - 630 ohms
(P7) No. 5 & No. 14 / 95 - 105 ohms

NOTE: Do not depress brake pedal.

11. Check body short of stroke sensor harness.
a) Turn ignition switch off.
b) Connect stroke sensor connector.
c) Disconnect ABS/TCS control module connector.





d) Measure resistance between ABS/TCS control module connector and body.
Connector & terminal / Specified resistance:
(P7) No. 4 & body / 1 M ohm
(P7) No. 5 & body / 1 M ohm
(P7) No. 14 & body / 1 M ohm

12. Check pump unit operation.
a) Turn ignition switch OFF.
b) Connect stroke sensor connector.
c) Connect ABS/TCS control module connector.
d) Operate the TCS sequence control and check that the front brake fluid pressure increases and decreases correctly.