Test Mode Procedure

NOTE: The torque sensor zero point calibration is performed automatically when the test mode inspection is conducted after the power steering ECU has been replaced with a new one.

HINT:

Speed sensor signals can be checked easily in test mode.
Test mode code C1571/71 is stored during the transition to test mode. This code does not indicate a malfunction since the code will be cleared when the ECU determines that the sensor is normal.
The test mode code is cleared simultaneously when test mode is terminated.

TEST MODE START-UP
1. When using an intelligent tester;
  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch on and enter test mode by following the instructions on the tester screen.
2. When not using an intelligent tester;
  1. Turn the ignition switch off and connect terminals 12 (TS) and 4 (CG) of the DLC3.
    SST 09843-18040
  2. Turn the ignition switch on.
  NOTE:
  - Be sure to connect the correct terminals of the connector, otherwise a malfunction may occur.
  - If the torque sensor zero point calibration has not been performed, the torque sensor zero point calibration is performed automatically when test mode is entered.
  Fig 1: Identifying DLC3 Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK TEST MODE DISPLAY
1. The P/S warning light blinks as shown on the left when test mode is entered.
  NOTE: If the torque sensor zero point calibration has not been performed, the P/S warning comes on until the torque sensor zero point calibration is completed, and shows the test mode blink pattern after the torque sensor zero point calibration is completed.
  
  Fig 2: Identifying Warning Light Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK VEHICLE SPEED SIGNAL (W/O ABS)
1. Drive the vehicle until the vehicle speed reaches 6 mph (10 km/h) or more.
  
  Fig 3: Identifying Vehicle Speed Graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
READ TEST MODE CODE
1. When using an intelligent tester;
  1. Check the DTCs in test mode.
    NOTE: Test mode code is cleared when test mode is terminated.
2. When not using an intelligent tester;
  1. Turn the ignition switch off.
  2. Connect terminals 12 (TS) and 4 (CG) of the DLC3, and also terminals 13 (TC) and 4 (CG) of the DLC3.
    SST 09843-18040
    
    Fig 4: Identifying DLC3 Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Read the number of times that the P/S warning light on the combination meter blinks.
    - To indicate the normal code, the P/S warning light comes on for 0.25 seconds at intervals of 0.25 seconds (2Hz blink).
    - When outputting a DTC, the P/S warning light displays it at intervals of 4 seconds. When outputting two or more DTCs, the P/S warning light displays each DTC at intervals of 2.5 seconds, and repeats from the first one 4 seconds after indicating the last one.
    - If two or more malfunctions are detected at the same time, DTCs are displayed in ascending numerical order.
      
      Fig 5: Identifying Warning Light Blinking Pattern
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

END OF TEST MODE

When using an intelligent tester;
1. Return to normal mode by following the instructions on the tester screen.
2. Turn the ignition switch off and disconnect the tester.

When not using an intelligent tester;

Turn the ignition switch off and disconnect terminals 13 (TC) and 4 (CG), and terminals 12 (TS) and 4 (CG) of the DLC3.
SST 09843-18040

Turn the ignition switch on.

TEST MODE CODE

DETECTION ITEM AND TROUBLE AREAS

Code	Detection Item	Conditions to clear code	Trouble areas
C1571/71	Vehicle speed check	Vehicle speed 6 mph (10 Km/h) or more	If code cannot be cleared, any of following areas may malfunction. Speed sensor Combination meter Power steering ECU Wire harness and connector