Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Lost Communication with ECM (C1437)

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the ECM via the CAN communication system.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1437

Lost Communication with ECM

When voltage at terminal +BS is 10 to 17.4 V and vehicle speed is 15 km/h (9 mph) or more, data cannot be sent to ECM continuously for 2 seconds or more.

  • CAN communication system (skid control ECU to ECM)
  • Skid control ECU (brake actuator assembly)
  • ECM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page PROCEDURE PROCEDURE ).

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (See page ). ABS/VSC/TRAC ).

ABS/VSC/TRAC

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

EFI Communication Open

EFI communication open detection

Normal or Error

Normal

Error: Momentary interruption

EFI Communication Invalid

ECM communication invalid detection

Normal or Error

Normal

Error: Invalid

HINT:

Perform the above inspection before removing the sensor and connector.

OK:

Normal (There are no momentary interruptions.)

NG

CHECK CAN COMMUNICATION SYSTEM

OK

2.

RECONFIRM DTC

(a) Clear the DTCs (See page ). (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(c) Start the engine.

(d) Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

(e) Check that no CAN communication system DTC is output (See page (f) Check if the same DTC is recorded (See page (f) Check if the same DTC is recorded (See page ).

(f) Check if the same DTC is recorded (See page Result Result ).

Result

Result

Proceed to

DTC C1437 is not output

A

DTC C1437 is output

B

CAN communication system DTC is output

C

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

C

CHECK CAN COMMUNICATION SYSTEM

Yaw Rate Sensor Malfunction (C1436)
DESCRIPTION The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system. The airbag sensor ...

Steering Angle Sensor Initialization Incomplete (C1439,C1445)
DESCRIPTION The skid control ECU (brake actuator assembly) acquires steering angle sensor zero point every time the ignition switch is turned ON and the vehicle is driven at 35 km/h (22 mph) or m ...

Other materials:

Manual Transmission Oil
Components COMPONENTS ILLUSTRATION On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT MANUAL TRANSMISSION OIL (a) Park the vehicle on a level surface. (b) Remove the transmission filler plug and gasket. (c) Check that the oil level is between 0 to 5 mm (0 to 0 ...

Rear Differential Lock Solenoid Circuit Low (P17C0)
DESCRIPTION This DTC is output when a malfunction is detected due to a short to ground occurring in the differential lock coil drive circuit of the rear differential. DTC No. Detection Item DTC Detection Condition Trouble Area P17C0 ...

Driving the vehicle
The following procedures should be observed to ensure safe driving. ■ Starting the engine ■ Driving Automatic transmission With the brake pedal depressed, shift the shift lever to D. Release the parking brake. Gradually release the brake pedal and gently depress the acceler ...

В© 2011-2019 Copyright www.ttguide.net