A/T Controls - MIL ON/DTC P0705 Set
T-SB-0277-09August 18, 2009
MIL "ON" DTC P0705
Service Category
Drivetrain
Section
Automatic Transmission/Transaxle
Market
USA
Applicability
Introduction
Some 2005 - 2009 model year Tacoma vehicles may exhibit a MIL "ON" condition with DTC P0705 (Transmission Range Sensor Circuit Malfunction (PRNDL Input)) stored. Common symptoms with this DTC can include possible delayed engagement into Reverse or Drive and possible harsh gear engagement when shifting between Park or Neutral into all other gears. Follow the procedure in this TSB to determine if this service bulletin is applicable and to repair the vehicle.
Repair Procedure Overview
1. Review DTC P0705 Freeze Frame Data to determine if this TSB may be applicable.
2. Attempt to duplicate DTC using testing procedure shown in this TSB to confirm TSB application.
3. If DTC cannot be duplicated, examine indicated wire harness electrical connector and Junction Block for evidence of liquid or corrosion.
4. If liquid or corrosion is observed in indicated wire harness connector and Junction Block, replacement of the Engine Room Main W~re Harness and Junction Block connector No.1 will be required to repair the vehicle.
Warranty Information
APPLICABLE WARRANTY
^ This repair is covered under the Toyota Comprehensive Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle's in-service date.
^ Warranty application is limited to occurrence of the specified condition described in this bulletin.
Parts Information
Required Tools & Equipment
NOTE
Additional TIS Techstream units may be ordered by calling Approved Dealer Equipment (ADE).
Repair Procedure
1. Confirm that DTC P0705 (Transmission Range Control Circuit Malfunction (PRNDL Circuit)) is stored in the Freeze Frame Data.
2. Print out the Freeze Frame Data for P0705 to allow easy review of data values. Note the values of the following parameters in the Data List:
^ Neutral Position SW Signal
^ Shift SW Status (R Range)
^ Shift SW Status (D Range)
^ Shift SW Status (4 or D)
^ Shift SW Status (3 Range)
^ Shift SW Status (2 Range)
^ Shift SW Status (L Range)
^ Stop Light Switch
3. Is the Neutral Position SW Signal value "ON" or "OFF" in the Freeze Frame Data?
NOTE
In Figure 3, transmission is not in any gear position on this vehicle.
^ If the Neutral Position SW Signal is "OFF" - This TSB does NOT apply.
Refer to the applicable model year Tacoma Repair Manual for diagnostics for DTC P0705. If the Neutral Position SW Signal is "ON" - Go to step 4.
4. Are any of the following Data List parameters "ON" when the Neutral Position SW Signal is "ON"?
^ Shift SW Status (R Range)
^ Shift SW Status (D Range)
^ Shift SW Status (4 or D)
^ Shift SW Status (3 Range)
^ Shift SW Status (2 Range)
^ Shift SW Status (L Range)
If NO - This TSB does NOT apply. Refer to the applicable model year Tacoma Repair Manual for diagnostics for DTC P0705.
5. Using Techstream clear all stored DTCs and then attempt to duplicate the MIL "ON" DTC P0705.
6. Prepare Techstream Data List for performing the testing/duplication procedure in step 7.
HINT
^ Using the Snapshot feature of Techstream makes it easier to review data and confirm duplication of this issue.
^ Refer to the University of Toyota online training class P901C "Techstream InDepth" for information about taking snapshots and graphing snapshots on Techstream.
A. Data List setup:
Select AT Datalist
B. Configure Snapshot as follows:
30 second duration
Trigger point at Start (0%)
C. Select Data Graph Display.
Select the following Data Parameters for display on the line graphs:
^ Shift SW Status (R Range)
^ Shift SW Status (D Range)
^ Neutral Position SW Signal
^ Stop Light Switch
7. Duplication test procedure.
The following inspection procedure can be performed with the vehicle on the lift or while driving the vehicle. If driving, select an area with NO traffic since extensive stopping and shifting between the Park, Neutral, Reverse, and Drive positions is required with the brake pressed and released in all gear positions.
A. Clear all stored DTCs using Techstream.
B. Start the vehicle.
C. Start Snapshot.
D. Shift between Park, Reverse, Neutral, and Drive positions.
E. Ensure engagement in all gear positions selected.
F. Press and release brake pedal when in all gear positions (this can be performed multiple times).
G. Review Snapshot after completing test to confirm if abnormal readings are observed.
H. Does the Neutral Position SW Signal show "ON" at any time when in Reverse or Drive?
^ If YES - Go to next step (7.1).
^ If NO - Go to step 8.
NOTE
Neutral Position SW Signal can show "ON" either with Stop Lamp Switch "ON" or "OFF".
I. Does the Neutral Position SW Signal change based on brake pedal input (Stop Lamp Switch "ON" or "OFF") when in Reverse or Drive?
^ If YES - Ground through Stop Lamp Circuit confirmed. Go to step 9.
^ If NO - TSB does NOT apply. Refer to the applicable model year Tacoma Repair Manual for diagnostics for DTC P0705.
8. Inspect connector DD and Junction Block No. 1 for liquid contamination or corrosion.
A. Disconnect battery.
B. Locate connector DD and Junction Block No. 1.
C. Remove the left front kick panel.
D. Identify connector DD and Junction Block No.1 (see Figures 6 and 7).
E. Disconnect connector DD from Junction Block No. 1.
F. Carefully inspect both components for liquid or corrosion in the connector and the Junction Block (especially the male and female terminals).
See Figures 8 and 9 for examples of liquid observed within the connector/Junction Block.
9. Replace the Engine Room Main Wire Harness and Junction Block No. 1.
10. Reconnect the battery.
11. Confirm proper operation of vehicle.
12. Repair is complete.