Preliminary Checks

Most driveability problems in the multi-point EFI system result from faulty wiring or loose and/or leaking hose connections. To avoid unnecessary component testing, visual check should be performed before beginning trouble shooting procedures. Preliminary visual check should include:

• Air ducts at air cleaner, turbocharger and throttle body.
• All electrical connections at components.

Check vacuum lines for tight, leak-free connections in these areas:

• Throttle body.
• Solenoid bank.
• Vapor canister.
• PCV valve to turbocharger vacuum port.
• Backpressure transducer.
• MAP sensor.

Ensure that following electrical connectors are properly attached:

• Two 25-way connectors (Red and Blue) at logic module.
• One and 3-way connectors at ASD relay.
• 12-way (White) and 10-way (Black) power module connectors.
• Four and one-way connectors at solenoid bank.
• 2-way speed sensor connector (in-line with speedometer cable).
• 2-way charge temperature sensor connector.
• 6-way throttle body connector.
• Four 2-way fuel injector connectors.
• O2 sensor connector.
• 2-way coolant temperature sensor connector.
• Two 3-way connectors (Gray and Black) at distributor.
• 1-way connector at detonation (knock) sensor.
• Two 3-way radiator fan relay connectors.
• Ground eyelet mounting onto intake manifold.