Chart C-18 Boost Control Solenoid Functional Check

Boost Control Solenoid Diagnostic Chart (Part 1 Of 2):

Boost Control Solenoid Diagnostic Chart (Part 2 Of 2):

Boost Control Solenoid Circuit:

CIRCUIT DESCRIPTION
Under most conditions, the Powertrain Control Module (PCM) commands the boost control solenoid to operate at a 100% duty cycle "ON" to allow full boost pressure upon demand. However, if reverse gear is selected or the PCM detects rapid deceleration or engine load is extremely high, reduced boost pressure is desired. Under these conditions, the PCM commands the boost control solenoid to operate at a O% duty cycle "OFF", which opens the bypass valve to reduce boost pressure by recirculating it back through the supercharger inlet.

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Verifies ignition feed to the boost control solenoid.
2. Ensures that the PCM can control the Quad Driver Module (QDM) output for the boost control solenoid and CKT 1724 is not open.
3. Checks for a faulty boost control solenoid (sticking open or leaking).
4. Checks for a faulty (restricted) boost control solenoid valve or a restriction in boost control system signal hoses.

DIAGNOSTIC AIDS
An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation.
Check for:
^ Poor connection or damaged harness - Inspect PCM harness connector for backed out terminal "BE10", improper mating, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.

^ Intermittent test - Disconnect PCM blue connector and install a Digital Voltmeter (DVM) to monitor voltage between PCM connector terminal "BE1O" and ground. With the key "ON," observe voltage while manipulating related connectors and wiring harness. If the failure is induced, the voltage display will change.