Toyota Tundra Service Manual: Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

CHECK FOR INTERMITTENT PROBLEMS

HINT:

A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected using the 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 interruption should be monitored.

HINT:

  • A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch is turned to ON (initial check).
  • If Error remains displayed for one of the items on the Techstream, check for continuity between the ECU and the item for which Error is displayed.
  • If a momentary interruption occurs and Error is displayed on the Techstream, Error will remain displayed on the Techstream for 1 second after the circuit returns to normal.
ABS/VSC/TRAC

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

EFI Communication Open

EFI communication open detection

Error or Normal

Error: Momentary interruption detected

Normal: Momentary interruption not detected

After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".

Yaw Rate Open

Yaw rate sensor open detection

Error or Normal

Error: Momentary interruption detected

Normal: Momentary interruption not detected

After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".

Deceleration Open

Acceleration sensor open detection

Error or Normal

Error: Momentary interruption detected

Normal: Momentary interruption not detected

After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".

Steering Open

Steering angle sensor open detection

Error or Normal

Error: Momentary interruption detected

Normal: Momentary interruption not detected

After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal".

IG Voltage Value Decreased

+BS voltage value decrease detection

Error or Normal

Error: Low voltage detected

Normal: Low voltage not detected

  • After low voltage occurs, if there is no low voltage error for 1 second, it switches from "Error" to "Normal".
  • Error: 9.8 V or less

IG Voltage Value Increased

+BS voltage value increase detection

Error or Normal

Error: High voltage detected

Normal: High voltage not detected

  • After high voltage occurs, if there is no high voltage error for 1 second, it switches from "Error" to "Normal".
  • Error: 17.4 V or higher

(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, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.

    Calibration

    Data List / Active Test

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