PRE-RELEASE
DTC P0724 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT HIGH
| DTC P0724 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT HIGH |
DIAGNOSIS:
Brake switch malfunction or open brake switch input signal circuit.
TROUBLE SYMPTOM:
Gear is not shifted down when climbing hill.
WIRING DIAGRAM:
CHECK TCM INPUT SIGNAL.
Disconnect the harness connector from TCM.Measure the voltage of harness between TCM and stop light switch.
Connector & terminal
(B55) No. 20 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
| No |
CHECK STOP LIGHT SWITCH.
Turn the ignition switch OFF.Disconnect the connector from stop light switch.
Measure the resistance between stop light switch connector.
Connector & terminal
No. 2 — No. 3:
Is the resistance more than 1 MΩ?
| Yes |
| No |
Replace the stop light switch.
CHECK HARNESS CONNECTOR BETWEEN TCM AND STOP LIGHT SWITCH.
Turn the ignition switch ON.Measure the voltage between TCM and chassis ground.
Connector & terminal
(B55) No. 20 (+) — Chassis ground (−):
Is the voltage less than 1 V?
| Yes |
| No |
Repair the short in power supply circuit to harness between TCM and stop light switch.
INSPECT POOR CONTACT.
Is there poor contact in the brake switch input signal circuit?
| Yes |
Repair poor contact.
| No |
Replace the TCM.
