Toyota 4Runner manuals

Toyota 4Runner: Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

1. DESCRIPTION

HINT:

A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected through the ECU data monitor 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) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

(f) 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 to ON (initial check).
  • If Error is displayed, check for continuity between the ECUs and the sensors or between ECUs.
  • Error remains displayed on the Techstream for 1 second after the harness signal changes from a momentary interruption (open circuit) to normal.
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

-

IG Voltage Value Decreased

IG1 voltage value decreased detection/

Error or Normal

Normal

-

IG Voltage Value Increased

IG1 voltage value increased 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

-

(g) While observing the screen, gently jiggle the connectors or wire harnesses between the ECUs and sensors or between ECUs.

OK:

Normal display appears.

HINT:

The connector and/or wire harness has a momentary interruption (open circuit) if the display changes. Repair or replace the connectors and/or wire harnesses as one of them is faulty.

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