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

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

(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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