P1730

P1730 Interlock

Description

Fail-safe function to detect interlock conditions.

On Board Diagnosis Logic

- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P1730" with SDT or 12th judgment flicker without SDT is detected when TCM does not receive the proper voltage signal from the sensor and switch.
- TCM monitors and compares gear position and conditions of each ATF pressure switch when gear is steady.

Possible Cause

- Harness or connectors
(The solenoid and switch circuit is open or shorted.)
- Low coast brake solenoid valve
- ATF pressure switch 2

DTC Confirmation Procedure

NOTE:

If "DTC Confirmation Procedure" has been previously performed, always turn ignition switch "OFF" and wait at least 10 seconds before performing the next test.

After the repair, perform the following procedure to confirm the malfunction is eliminated.

with SDT

1 Turn ignition switch "ON". (Do not start engine.)
2 Select "Data list" mode for "AT" with SDT.
3 Start engine.
4 Drive vehicle and maintain the following conditions for at least 2 consecutive seconds.
SLCT LVR POSI: "D" position
5 If DTC is detected, go to "Diagnosis Procedure".

with GST

Follow the procedure "WITH SDT".

Judgment of Interlock

When interlock is judged to be malfunctioning, the vehicle should be fixed in 2GR, and should be set in a condition in which it can travel.

When one of the following fastening patterns is detected, the fail-safe function in correspondence with the individual pattern should be performed.

NOTE:

When the vehicle is driven in 2GR, a input speed sensor malfunction is displayed, but this is not a input speed sensor malfunction.

When interlock is detected at the 3GR or more, it is locked at the 2GR.

Diagnosis Procedure

1. PERFORM DTC CHECK

With SDT
1 Drive vehicle.
2 Stop vehicle and turn ignition switch OFF.
3 Turn ignition switch ON.
4 Select "DTC check" mode for "AT" with SDT.
Without SDT
1 Drive vehicle.
2 Stop vehicle and turn ignition switch OFF.
3 Turn ignition switch ON.
4 Perform self-diagnosis. Refer to [Diagnosis Procedure without SDT] Diagnosis Procedure without SDT.

OK or NG
OK
GO TO 2.
NG
Check low coast brake solenoid valve circuit and function. Refer to [Main Power Supply and Ground Circuit Check] P1772 , P1774.

2. CHECK DTC

Perform "DTC Confirmation Procedure".
- Refer to "DTC Confirmation Procedure".

OK or NG
OK
INSPECTION END
NG
GO TO 3.

3. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to Main Power Supply and Ground Circuit Check.

OK or NG
OK
GO TO 4.
NG
Repair or replace damaged parts.

4. DETECT MALFUNCTIONING ITEM

Check the following.
- The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

OK or NG
OK
Replace the control valve with TCM. Refer to [Control Valve with TCM: Removal and Installation] Service and Repair.
NG
Repair or replace damaged parts.