LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 1993 >> SVX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Code Testing >> Code 24: By-Pass Air Control Solenoid Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 24: By-Pass Air Control Solenoid Valve

NOTE: Refer to illustration for ECU connector and terminal identification. See Figure .
  1. Turn ignition switch to ON position. Using a DVOM, check voltage between ECU connector B62, terminal No. 14 (backprobe) and ground. Voltage should be 10 volts or greater. If voltage is as specified, go to step 4). If voltage is not as specified, go to next step.
  2. Turn ignition switch to OFF position. Disconnect ECU and main relay connectors. Using an ohmmeter, check resistance between ECU connector B62, terminal No. 14 and main relay connector terminal No. 4 (Black/White wire). Resistance should be zero ohms. If resistance is as specified, go to next step. If resistance is not as specified, repair circuit as necessary.
  3. Turn ignition switch to ON position. Using a DVOM, check voltage between ground and main relay connector terminals No. 1 (Black/White wire) and No. 2 (Brown/Black wire). Voltage should be 10 volts or greater at each terminal. If voltage is not as specified, repair appropriate circuit as necessary. If voltage is as specified, replace main relay.
  4. Turn ignition switch to ON position. Using a DVOM, check voltage between ground and ECU connector B62, terminals No. 1 and 2. Voltage should be 6 volts or greater at terminal No. 1, and 7 volts or greater at terminal No. 2. If voltage is not as specified, go to next step. If voltage is as specified, check ECU connector terminals for good contact. Repair as necessary. If connector terminals are okay, replace ECU.
  5. Turn ignition switch to OFF position. Remove throttle body from collector. Disconnect by-pass air control solenoid valve connector. Using an ohmmeter, check resistance between ECU connector B62, terminal No. 1 and solenoid valve connector terminal No. 1 (White wire), and between ECU connector B62, terminal No. 2 and solenoid valve connector terminal No. 3 (White/Black wire). Resistance should be zero ohms for both circuits. If resistance is not as specified, repair appropriate circuit as necessary. If resistance is as specified, replace solenoid valve.
scientia non olet · About LEMON Manuals