Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Check Mode Procedure



(a) Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are detected with 1 trip detection logic.


(a) Make sure that the following conditions are met:

(1) Battery positive voltage 11 V or higher.

(2) Throttle valve fully closed.

(3) Shift lever in P or N.

(4) Air conditioning off.

(b) Turn the ignition switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Utility / Check Mode.

(g) Change the ECM to check mode. Make sure the MIL flashes as shown in the illustration.



All DTCs and freeze frame data will be cleared if: 1) the Techstream is used to change the ECM from normal mode to check mode or vice versa; or 2) during check mode, the ignition switch is turned from ON to ACC or off.

Before entering check mode, make notes of the DTCs and freeze frame data.

(h) Start the engine. The MIL should turn off after the engine starts.

(i) Perform Monitor Drive Pattern for the ECT test (See page (Or, simulate the conditions of the malfunction described by the customer.) ).

(Or, simulate the conditions of the malfunction described by the customer.)

(j) After simulating the malfunction conditions, use the Techstream to check the DTC and freeze frame data.

Terminals Of Ecm
TERMINALS OF ECM 1. ECM HINT: The standard voltage between each pair of ECM terminals is shown in the table below. In the table, first follow the information under "Condition". Look u ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) When troubleshooting OBD II (On-Board Diagnostics) vehicles, an OBD II scan tool (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector ...

Other materials:

Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" below. Lighting system DTC Code Detection Item See page ...

DISASSEMBLY PROCEDURE 1. REMOVE HOOD BULGE ASSEMBLY (w/ Hood Bulge) (a) Remove the 4 nuts. (b) Disengage the clip from back side of the hood panel to remove the hood bulge assembly together with the air intake guide. 2. REMOVE NO. 2 HOOD BU ...

PTC Heater Circuit
DESCRIPTION PTC HTR heater relays are closed in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator heater unit. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits rela ...

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