AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT)(D) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0801 REVERSE INHIBIT CONTROL CIRCUIT

DTC DETECTING CONDITION:

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

TROUBLE SYMPTOM:

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

• Gear cannot be selected from “N” range to “R” range.

WIRING DIAGRAM:

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1.CHECK HARNESS CONNECTOR BETWEEN TCM AND SHIFT LOCK SOLENOID.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from TCM and shift lock solenoid.

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

Connector & terminal

(B54) No. 3 — (B117) No. 4:

Is the resistance less than 1 Ω?

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

2.CHECK HARNESS CONNECTOR BETWEEN TCM AND SHIFT LOCK SOLENOID.

Measure the resistance of the harness between TCM and chassis ground.

Connector & terminal

(B54) No. 3 — Chassis ground:

Is the resistance 1 MΩ or more?

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

3.CHECK HARNESS BETWEEN SHIFT LOCK SOLENOID AND CHASSIS GROUND TERMINAL.

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?

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

4.CHECK SHIFT LOCK SOLENOID.

Measure the resistance of shift lock solenoid terminals.

Connector & terminal

(B117) No. 5 — No. 4:

Is the resistance between 20 — 40 Ω?

Replace the shift lock solenoid.

5.CHECK OUTPUT SIGNAL OF TCM.

1) Connect all connectors.

2) Turn the ignition switch to ON.

3) Move the select lever to “D” range.

4) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B54) No. 3 (+) — Chassis ground (−):

Is the voltage 10.5 V or more?

6.CHECK OUTPUT SIGNAL OF TCM.

1) Lift up the vehicle and place it on rigid racks.

NOTE:

Raise all wheels off the floor.

2) Start the engine.

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

NOTE:

The speed difference between front and rear wheels may illuminate the ABS warning light, but this does not indicate a malfunction. When AT control diagnosis is finished, perform the ABS or VDC clear memory of on-board diagnostics system.

4) Measure the voltage between TCM and chassis ground.

Connector & terminal

(B54) No. 3 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Even if the power indicator light is blinking, the circuit is in normal condition at this time. A temporary poor contact of connector or harness may be the cause. Repair the harness or connector in the reverse inhibitor control circuit.

7.CHECK POOR CONTACT.

Is there poor contact in the reverse control circuit?

Repair the poor contact.

Replace the TCM.