Turbo Pressure Check

Ensure intake air hoses are connected. Install hose, 3-way connector and pressure gauge between intake manifold gas filter and turbo pressure sensor. See Fig 1. Turbo pressure sensor is mounted on intake manifold, near throttle cables and contains a Black 3-pin electrical connector.
Drive vehicle with engine at 5600 RPM or more with throttle fully open and transmission in 1st gear on M/T or "L" range on A/T. Note turbo pressure. Turbo pressure should be 8.8-10.8 psi (.62-.76 kg/cm² ).
If turbo pressure is less than specified, check intake air and exhaust systems for leaks. If no leaks exist, replace turbocharger assemblies. If turbo pressure exceeds specification, check wastegate actuator hose for leaks or cracks. If no leaks or cracks exist, replace turbocharger assemblies. Remove test equipment.

Fig 1: Connecting Pressure Gauge Hose For Checking Turbo Pressure (Turbo)

NOTE: If a problem exists in the turbo pressure, turbo pressure sensor, intake control valve circuit, wastegate valve control circuit, exhaust gas control valve circuit or exhaust by-pass valve control circuit, a Diagnostic Trouble Code (DTC) will be stored in the Engine Control Module (ECM). For diagnosis of DTCs, see appropriate TESTS W/CODES article.