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Canada - ABS/TCS - VSC Lamp ON/DTC C1203 Set






Bulletin
1311

Issue Date
2003-12-01

Reference
BR-03-006

Model
4Runner

Year Range
2003

Market
Canada

Component
BR

Subject:
VSC LIGHT ON - DTC C1203

Some 2003 model year 4Runner vehicles may experience a VSC light ON condition and DTC C1203 in Skid Control Computer memory. A modification to the Skid Control Computer logic has been made to prevent this condition.

APPLICABLE VEHICLES:
- 2003 model year 4Runner vehicles.







PRODUCTION CHANGE INFORMATION:







WARRANTY INFORMATION:







REQUIRED SSTs:







PARTS INFORMATION:

1. A yellow 15 mm round sticker is affixed near the part number label on the supply part box, not on the part. The yellow sticker identifying the countermeasure part will be discontinued at the end of March, 2004.
2. After the yellow sticker is discontinued, confirm the C/M part by the inspecting the lot number on the Skid Control Computer.







3. The lot number on the Skid Control Computer part number label must be "3H18" or later.

REPAIR PROCEDURE:
1. Remove Instrument Panel Finish Plate
2. Remove Instrument Panel Finish Panel Subassembly Lower
3. Remove Instrument Panel Lower LH







4. Remove Instrument Panel Junction Block Assembly

a) Remove the bolt and 2 nuts, then move the instrument panel junction block assembly aside.

5. Remove Skid Control Computer Assembly
a) Disconnect the 4 Skid Control Computer assembly connectors.







b) Remove the 2 nuts and the Skid Control Computer assembly.
c) Disconnect the skid control buzzer connector and remove the skid control buzzer assembly from Skid Control Computer assembly.







6. Skid Control Computer Assembly

a) Install the skid control buzzer on the Skid Control Computer assembly, and connect the skid control buzzer connector.
b) Install the Skid Control Computer assembly with 2 nuts.
Torque: 5.0 N-m (51 kgf-cm, 44 in.-lbf)

c) Connect the 4 Skid Control Computer assembly connectors.







7. Install Instrument Panel Junction Block Assembly
a) Install the instrument panel junction block assembly with bolt and 2 nuts.

8. Install Instrument Panel Lower LH
9. Install Instrument Panel Finish Panel Subassembly Lower
10. Install Instrument Panel Finish Plate
11. Perform Zero Point Calibration of Yaw Rate and Deceleration Sensors as shown.

CALIBRATION PROCEDURE WITH DIAGNOSTIC TESTER:
When having replaced the yaw rate sensor, deceleration sensor or the ECU, perform below process for zero point of yaw rate and deceleration sensors.

NOTE:
While performing the zero point procedure, do not tilt, move or shake the vehicle. The vehicle must remain in a stationary condition throughout the entire process. Do not start the engine and be sure to perform the procedure on a level surface with an inclination of less than 1 %.

1. Connect Diagnostic Tester to DLC3.
2. Confirm that the shift lever is in "P" range.











3. Follow the flow for the calibration procedure.


CALIBRATION PROCEDURE WITH SST:
Zero Point Calibration Of Yaw Rate And Deceleration Sensors Using SST 09843-18040

When having replaced the yaw rate sensor, deceleration sensor or the ECU, perform below process for zero point of yaw rate and deceleration sensors.

NOTE:
While performing the zero point procedure, do not tilt, move or shake the vehicle. The vehicle must remain in a stationary condition throughout the entire process. Do not start the engine and be sure to perform the procedure on a level surface with an inclination of less than 1 %.

Follow the procedure below for zero point calibration of yaw rate and deceleration sensors.
1. Ensure the shift lever is in P range.
2. Turn the ignition switch ON.







3. Using SST 09843-18040, repeat a cycle of short and open between terminals Ts and CG of DLC3 4 times or more within 8 sec. Verify that the VSC indicator light is lit indicating the recorded zero point is erased.
4. Turn the ignition switch OFF.
5. Be sure the terminals Ts and CG of DLC3 are disconnected.
6. Turn the ignition switch ON.
7. Check that the VSC warning light goes off about 15 sec. after the ignition switch is turned ON.
8. After ensuring that the VSC warning light remains OFF for 2 sec., turn the ignition switch OFF.
9. Connect the terminal Ts and CG of DLC3 using SST 09843-18040
10. Turn the ignition switch ON.
11. After turning the ignition switch ON, check that the VSC warning light is lit for about 4 sec. and then starts quick blinking at 0.13 sec. intervals.
12. After ensuring the blinking of the VSC warning light for 2 sec., turn the ignition switch OFF.
13. Remove the SST from terminals Ts and CG of DLC3.

CONFIRM ZERO POINT CALIBRATION:
Drive the vehicle to confirm there are no re-occuring lights or DTCs.


NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.
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