Lack of Power or Excessive Fuel Consumption

HINT: Before troubleshooting the turbocharger, first check the engine itself. (Valve clearance, engine compression, ignition timing etc.)

1. POSSIBLE CAUSE: TURBOCHARGING PRESSURE TOO LOW.
TESTING PROCEDURE: Check turbocharging pressure.
Refer to "Testing Turbocharger Pressure".
Testing and Inspection
Turbocharging pressure: 61 - 75 kPa (8.8 - 10.8 psi)
OK: Turbocharger system is OK. Go to "Diagnosis by Symptom" under Computers and Control Systems / Testing Procedures.
Testing and Inspection
NG: If the pressure is below specifications, begin diagnosis from item 2.


2. POSSIBLE CAUSE: RESTRICTION OR LEAK IN THE AIR INTAKE SYSTEM
TESTING PROCEDURE: Check intake air system.
Refer to "Intake Air System Inspection".
Testing and Inspection
OK: Go to item 3.
NG: Repair or replace parts as necessary.


3. POSSIBLE CAUSE: RESTRICTION OR LEAK IN THE EXHAUST SYSTEM
TESTING PROCEDURE: Check exhaust system.
Refer to "Exhaust System Inspection".
Testing and Inspection
OK: Go to item 4.
NG: Repair or replace parts as necessary.


4. POSSIBLE CAUSE: ERRATIC TURBOCHARGER OPERATION
TESTING PROCEDURE:
(A) Check rotation of turbine shaft.
OK: Go to step (B).
NG: If it does not turn or turns with a heavy drag, replace the turbocharger assembly.
(B) Check axial and radial play of turbine shaft.
Maximum axial play: 0.110 mm (0.0045 in.)
Maximum radial play: 0.162 mm (0.0064 in.)
OK: If no problems have been found proceed to "Diagnosis by Symptom" under Computers and Control Systems / Testing Procedures.
Testing and Inspection
NG: If the play is greater than maximum, replace the turbocharger assembly.