Test D2 - Turbocharger Boost Control Solenoid (Boost)

NOTE: Enter this test only when a Code 42 is displayed during the QUICK TEST procedure or when directed here from another CIRCUIT TEST.

Fig 1: BOOST Solenoid Circuit & Connector Identification

BOOST CIRCUIT PIN IDENTIFICATION

Circuit	Breakout Box Pin	ECA Pin
Boost	35	3R

1) Checking System Integrity Visually check all wiring, harness connectors and components for evidence of damage, overheating, shorting or looseness. If a fault is found, repair as necessary. If no faults are found, go to next step.

2) Checking Solenoid Function Install breakout box and leave ECA disconnected. Turn ignition on. Locate boost solenoid mounted on lower side of turbocharger. Apply vacuum to boost solenoid. Vacuum should hold. Jumper breakout box test pin No. 31 to ground. If vacuum is held, solenoid is functioning okay. Fault is in another circuit or ECA. If not, go to step 3.

3) Check Voltage To Boost Control Solenoid Disconnect solenoid connector. With ignition on, measure voltage between VPWR and ground. If voltage reading is less than 10 volts, repair VPWR wire to main relay. If voltage reading is more than 10 volts, measure voltage between solenoid VPWR and BOOST wire (ignition on).

4) Activate solenoid by quickly increasing engine speed above 4500 RPM. Replace solenoid if voltage is more than 10 volts, when activated. If voltage is less than 10 volts, go to next step.

5) Circuit Continuity Check With breakout box installed and ECA disconnected, remove BOOST solenoid connector. Check for continuity between BOOST test pin and BOOST solenoid wire. If continuity does not exist, repair BOOST circuit between solenoid and ECA.

6) If continuity is present, check for continuity between BOOST test pin and all other test pins. If continuity is found between BOOST test pin and another test pins, BOOST wire is shorted to that circuit. Repair as necessary and recheck circuit. If all circuits are okay, replace ECA.