Toyota Highlander Service Manual: Problem symptoms table

Toyota Highlander Service Manual / Differential / Differential system (4WD) / Problem symptoms table

Use the table below to help you find the cause of the problem. The causes of the problem are listed in order of probability in the "Suspected Area" column. Check each part in order. If necessary, replace these parts.

Symptom	Suspected Area
Oil leak from rear differential	Oil level (Too high or wrong grade) Rear differential front oil seal (Worn or damaged) Side gear shaft oil seal (Worn or damaged) Companion flange (Loose or damaged) Drive shaft (Damaged)
Oil leak from drive pinion shaft	Oil level (Too high or wrong grade) Rear differential front oil seal (Worn or damaged) Companion flange (Loose or damaged)
Noise in rear differential	Oil level (Low or wrong grade) Excessive backlash between pinion and ring gear Ring, pinion or side gears (Worn or chipped) Drive pinion bearing Side bearing (Worn)

Precaution

Before disassembly, clean the outside of the rear differential assy and remove any sand or mud to prevent it from entering the inside of the assembly during disassembly and installati ...

Differential (4WD)

COMPONENTS ...

More about Toyota Highlander:

Inspection
1. INSPECT MASS AIR FLOW METER (a) Check the output voltage. Apply battery voltage across terminals 1 (+B) and 2 (E2G). Connect the positive (+) tester probe to terminal 3 (VG), and negative (-) tester probe to terminal 2 (E2G). Blow air into the Mass Air Flow (M ...