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DTC P0801 REVERSE INHIBIT CONTROL CIRCUIT

DTC P0801 REVERSE INHIBIT CONTROL CIRCUIT

DIAGNOSIS:

Shift lock solenoid malfunction, open or short reverse inhibitor control circuit.

TROUBLE SYMPTOM:


• Gear is shifted from “N” range to “R” range during driving at 20 km/h (12 MPH) or more.

• Gear can not be shifted from “N” range to “R” range.


WIRING DIAGRAM:


CHECK HARNESS CONNECTOR BETWEEN TCM AND SHIFT LOCK SOLENOID.

Turn the ignition switch to OFF.

Disconnect the connector from TCM and shift lock solenoid.

Measure the resistance harness between TCM and shift lock solenoid connector.

Connector & terminal

(B56) No. 18 — (B117) No. 4:

Is the resistance less than 1 Ω?

Yes


No

Repair the open circuit in harness between TCM and shift lock solenoid connector.


CHECK HARNESS CONNECTOR BETWEEN TCM AND SHIFT LOCK SOLENOID.

Measure the resistance of harness between TCM and chassis ground.

Connector & terminal

(B56) No. 18 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair the short circuit in harness between TCM and shift lock solenoid connector.


CHECK HARNESS CONNECTOR BETWEEN SHIFT LOCK SOLENOID AND CHASSIS GROUND.

Measure the resistance of harness between shift lock solenoid and chassis ground.

Connector & terminal

(B117) No. 5 — Chassis ground:

Is the resistance less than 1 Ω?

Yes


No

Repair the open circuit in harness between chassis ground terminal and shift lock solenoid connector.


CHECK SHIFT LOCK SOLENOID.

Measure the resistance between shift lock solenoid.

Connector & terminal

(B117) No. 5 — No. 4:

Is the resistance 20 — 40 Ω?

Yes


No

Replace the shift lock solenoid.


CHECK TCM OUTPUT SIGNAL.

Connect all connectors.

Turn the ignition switch to ON.

Move the select lever to “D” range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B56) No. 18 (+) — Chassis ground (−):

Is the voltage more than 10.5 V?

Yes


No


CHECK OUTPUT SIGNAL FROM TCM.

Lift-up the vehicle and place rigid racks.

Note

Raise all wheels off ground.


Start the engine.

Move the select lever “D” range and slowly increase vehicle speed to 20 km/h (12 MPH).

Note

The speed difference between front and rear wheels may light ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system.


Measure the voltage between TCM and chassis ground.

Connector & terminal

(B56) No. 18 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Yes

Even if the POWER indicator blinks, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be cause. Repair the harness or connector in reverse inhibitor control circuit.


No


CHECK POOR CONTACT.

Is there poor contact in the reverse inhibitor control circuit?

Yes

Repair the poor contact.


No

Replace the TCM.