Toyota Tacoma 2015-2018 Service Manual: Engine Control System Malfunction (C1201)

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Engine Control System Malfunction (C1201)

DESCRIPTION

If a malfunction in the engine control system is detected, VSC and TRAC operations are prohibited by the fail-safe function.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1201	Engine Control System Malfunction	A malfunction signal is received from the ECM.	Engine control system

PROCEDURE

1.	CHECK DTC (ENGINE CONTROL SYSTEM)

(a) Check if any engine control system DTC is output.

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

USE SIMULATION METHOD TO CHECK

GO TO ENGINE CONTROL (DIAGNOSTIC TROUBLE CODE CHART)

SM Solenoid Circuit (C1225,C1468,C1469,C146A,C146B)

DESCRIPTION These solenoids turn on when signals are received from the skid control ECU (brake actuator assembly) and they control the pressure acting on the wheel cylinders to control the brakin ...

ECM Communication Circuit Malfunction (C1203)

DESCRIPTION The circuit is used to send TRAC and VSC control information from the skid control ECU (brake actuator assembly) to the ECM, and engine control information from the ECM to the skid co ...

Other materials:

Driver Side Power Window does not Operate with Power Window Master Switch
DESCRIPTION When the engine is running or the ignition switch is ON, the front power window regulator motor assembly LH is operated by the power window regulator master switch assembly. The front power window regulator motor assembly LH has motor, regulator, and ECU functions. HINT: If the ...

Check Mode Procedure
CHECK MODE PROCEDURE 1. DESCRIPTION Check mode has a higher sensitivity to malfunctions and can detect malfunctions that cannot be detected in normal mode. Check mode can also detect all of the malfunctions that can be detected in normal mode. In check mode, DTCs are stored with 1 trip detec ...

Removal
REMOVAL PROCEDURE 1. REMOVE REAR SEATBACK HINGE COVER 2. REMOVE REAR SEATBACK ASSEMBLY 3. REMOVE REAR SEATBACK HINGE SUB-ASSEMBLY 4. REMOVE REAR DOOR SCUFF PLATE 5. DISCONNECT REAR DOOR OPENING TRIM WEATHERSTRIP (a) Disconnect the rear door opening trim weatherstrip to ...