Toyota 4Runner manuals

Toyota 4Runner: Test Mode Procedure




  • When entering signal check mode, the tire pressure warning ECU stores all the signal check DTCs first. After completing the signal check for each inspection item, the DTCs for systems that are determined to be normal by the tire pressure warning ECU are cleared.
  • The DTCs for other inspection items may not be cleared when only a certain signal is inspected.
  • When signal check returns to normal mode, all the signal check DTCs are cleared.

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Utility / Signal Check.


Every time the test mode DTC clear conditions are satisfied, the tire pressure warning light turns on for 1 second. Then, the tire pressure warning light blinks at 0.125 second intervals.

(f) Start the engine and allow it to run at 1000 rpm for 3 seconds or more to check the engine speed signal (C2194/94).

(g) Drive the vehicle at 20 km/h (12 mph) or more for 3 seconds or more to check the vehicle speed signal (C2191/91).

(h) Loosen the valve core and rapidly reduce the pressure by at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds to check the transmitter data (C2181/81 to C2184/84 or C2185/85*).

  • *: w/ Spare Tire Pressure Warning Valve and Transmitter


The transmitter ID can be transmitted by rapidly reducing the tire pressure.

(i) Check that the tire pressure warning system test mode DTCs are cleared.

Test Mode DTC

Test Signal

Test Mode DTC Clear Condition

C2181/81 to C2184/84


Transmitter Data

Receive data from transmitter which has registered ID in tire pressure warning ECU


Vehicle Speed Signal

Vehicle speed of 20 km/h (12 mph) or more is detected for 3 seconds or more


Engine Speed Signal

Engine speed of 1000 rpm or more is detected for 3 seconds or more

  • *: w/ Spare Tire Pressure Warning Valve and Transmitter

(j) Result


After the signal check is completed, check for test mode (signal check mode) DTCs to confirm the system status.



Test mode DTCs are output

Repair faulty part and enter Signal Check again

Test mode DTCs are cleared

No problem

(k) End of test mode (signal check mode)

(1) After completing test mode (Signal Check mode), turn the ignition switch off and disconnect the Techstream.

(l) Test mode (signal check mode) DTCs

(1) If a trouble code is output during the test mode (signal check mode) DTC check, check the diagnosis procedure listed for that code. For details of each code, refer to "See page" below.

DTC Code

Detection Item

See page


Transmitter ID1 not received


Transmitter ID2 not received


Transmitter ID3 not received


Transmitter ID4 not received


Transmitter ID5 not received


Vehicle speed signal error


Engine speed signal error

  • *: w/ Spare Tire Pressure Warning Valve and Transmitter
REGISTRATION PROCEDURE 1. BEFORE REGISTRATION NOTICE: The transmitter ID is written on the tire pressure warning valve and transmitter. It is not possible to read the transmitter ID after instal ...

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