Toyota Tacoma manuals

Toyota Tacoma (2015-2018) Service Manual: Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

1. CHECK FOR INTERMITTENT PROBLEMS

HINT:

A momentary interruption (open circuit) in the connectors and/or wire harnesses between the sensors and ECUs can be detected using the ECU Data List function of the Techstream.

(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) Follow the directions on the Techstream to display the Data List and select areas where momentary interruptions should be monitored.

HINT:

  • A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned ON (initial check).
  • If the Error display remains displayed, measure the resistance between the ECUs and sensors, or between ECUs.
  • The Error display on the Techstream will remain displayed for 1 second after the harness signal changes from momentary interruption (open circuit) to the normal condition.
ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FR Speed Open

Front speed sensor RH open circuit detection/

Error or Normal

Normal

-

FL Speed Open

Front speed sensor LH open circuit detection/

Error or Normal

Normal

-

RR Speed Open

Rear speed sensor RH open circuit detection/

Error or Normal

Normal

-

RL Speed Open

Rear speed sensor LH open circuit detection/

Error or Normal

Normal

-

EFI Communication Open

ECM communication open circuit detection/

Error or Normal

Normal

-

Yaw Rate Open

Yaw rate and acceleration sensor open circuit detection/

Error or Normal

Normal

-

Deceleration Open

Deceleration sensor open circuit detection/

Error or Normal

Normal

-

Steering Open

Steering angle sensor open circuit detection/

Error or Normal

Normal

-

Master Cylinder Open

Master cylinder pressure sensor open circuit detection/

Error or Normal

Normal

-

FR Speed Sensor Voltage Open

Front speed sensor RH voltage open circuit detection/

Error or Normal

Normal

-

FL Speed Sensor Voltage Open

Front speed sensor LH voltage open circuit detection/

Error or Normal

Normal

-

RR Speed Sensor Voltage Open

Rear speed sensor RH voltage open circuit detection/

Error or Normal

Normal

-

RL Speed Sensor Voltage Open

Rear speed sensor LH voltage open circuit detection/

Error or Normal

Normal

-

M/C Pressure Sensor Noise

Master cylinder pressure sensor noise detection/

Error or Normal

Normal

-

Yaw Rate Sensor Voltage Open

Yaw rate and acceleration sensor voltage open circuit detection/

Error or Normal

Normal

-

EFI Communication Invalid

ECM communication invalid detection/

Error or Normal

Normal

-

Master Cylinder Pressure Sensor Power Supply Open

Master cylinder pressure sensor power supply voltage status/

Error or Normal

Normal

-

Solenoid Power Supply Open

Solenoid power supply voltage status/

Error or Normal

Normal

-

Motor Power Supply Open

Motor power supply voltage status/

Error or Normal

Normal

-

Stop Switch Open

Momentary interruption (open circuit) status in wire harness between skid control ECU (brake actuator assembly) and stop light switch assembly status/

Error or Normal

Normal

-

(f) While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.

OK:

Normal is displayed.

HINT:

If the display changes, the connector and/or the wire harness has caused a momentary interruption of the circuit. Repair or replace the connector and/or wire harness as one of them is faulty.

System Diagram
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