Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Differential System (w/ Differential Lock)

Symptom

Suspected Area

See page

Oil leak from front differential

Oil (level too high or wrong grade)

Front differential side gear shaft oil seal (worn or damaged)

Companion flange (loose or damaged)

Oil leak from rear differential

Oil (level too high or wrong grade)

Rear differential carrier oil seal (worn or damaged)

Companion flange (loose or damaged)

Oil leak from front drive pinion shaft

Oil (level too high or wrong grade)

Front differential carrier oil seal (worn or damaged)

Companion flange (loose or damaged)

Oil leak from rear drive pinion shaft

Oil (level too high or wrong grade)

Rear differential carrier oil seal (worn or damaged)

Companion flange (loose or damaged)

After differential lock switch is operated, rear differential lock indicator light remains off or illuminated

ECU power source circuit

Differential lock switch

4 wheel drive control ECU

CAN communication system

Combination meter assembly

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use the following procedure listed to troubleshoot the differential system (w/ Differential Lock). *: Use the Techstream. PROCEDURE 1 ...

System Description
SYSTEM DESCRIPTION 1. DESCRIPTION The differential system (w/ Differential Lock) directly connects the rear left and right wheels so that even if one wheel slips while driving where d ...

Other materials:

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the smart key system (for Entry Function). *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...

Disassembly
DISASSEMBLY PROCEDURE 1. INSPECT FRONT PROPELLER SHAFT UNIVERSAL JOINT SPIDER BEARING (a) Check the spider bearings for wear and damage. (b) Check each spider bearing's axial play by turning the yoke while holding the shaft tightly. Maximum bearing axial play: 0 to 0.05 mm (0 to 0.002 i ...

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. CHECK FUEL PUMP ASSEMBLY OPERATION (a) Check fuel pressure. (1) Connect the Techstream to the DLC3. (2) Start the engine. (3) Turn the Techstream on. (4) Enter the following menus: Powertrain / Engine / Active Test / Control the Target Fuel Pressure. (5) ...

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