Toyota 1KZ-TE Repair Manual page 197

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T ROUBL ESHOOT I NG
PROBLEM SYMPTOMS TABLE
HINT:
Before troubleshooting the turbocharger, first check the engine itself. (valve clearance, engine compression,
etc.)
I NS UFFI CI E NT ACCE LE RATI O N, L ACK O F P O WE R O R E X C ESSIVE FUEL CONSUMPTION
5. Turbocharging pressure too low
6. Restricted intake system
7. Leak in intake air system
8. Restricted exhaust system
9. Leak in exhaust system
10.Erratic turbocharger operation
ABNO RMAL NO I S E
1. Turbocharging heat insulator resonance
2. Erratic turbocharger operation
EXCESSIVE OIL CONSUMPTION OR WHITE EXHAUS T
NOTICE:
Some oil mist in blowby from PCV is normal. Do not mistake it for oil leak from turbocharger.
Faulty turbocharger oil seal
TURBOCHARGING
Possible Cause
Possible Cause
Possible Cause
- - TROUBLESHOOTING
Check Procedure and Correction Method
Check turbocharging pressure.
Check intake air system, and repair or replace parts as
necessary.
Check intake air system, and repair or replace parts as
necessary.
Check exhaust system, and repair or replace parts as nec-
essary.
Check exhaust system, and repair or replace parts as nec-
essary.
Check rotation of turbine shaft, and replace bearing hous-
ing if necessary.
Check axial and radial plays of turbine shaft, and replace
bearing housing if necessary.
Check Procedure and Correction Method
Check for loose, improperly installed or deformed insulator
nuts and bolt, and repair or replace as necessary.
Check rotation of turbine shaft, and replace bearing hous-
ing if necessary.
Check axial and radial plays of turbine shaft, and replace
bearing housing if necessary.
Check Procedure and Correction Method
Check for oil leakage in exhaust system.
S Remove exhaust manifold converter from turbocharger,
and check for excessive carbon deposits on turbine
wheel. Excessive carbon deposits indicate a faulty turbo-
charger.
Check for oil leakage in intake air system.
S Check for axial and radial plays of turbine shaft, and re-
place bearing housing if necessary.
1KZ-TE Pages From Manual
TO MODEL INDEX
TC- -1
TC01W- -02
See page
TC - - 3
EM - - 1
EM - - 44
EM - - 1
EM - - 44
EM - - 44
EM - - 44
TC - - 10
See page
TC - - 6
TC - - 10
See page
TC - - 10