Storm GSi (DOHC)
- Disconnect vacuum supply hose from secondary air control (intake air) Vacuum Switching Valve (VSV), located at rear of engine compartment. The VSV contains a White/Blue and Black/Yellow wire connector. Using vacuum gauge, check vacuum reading at supply hose with engine idling.
- Vacuum reading should be 10 in. Hg. If reading is not correct, repair vacuum leak. If reading is okay, connect vacuum pump to supply side of VSV.
- With ignition on and engine off, apply vacuum and note linkage operation at vacuum actuator for auxiliary valves.
- If linkage moved, proceed to step 7). If linkage did not move, disconnect electrical connector at VSV and repeat step 3). If linkage moved with electrical connector removed, check for short to ground in White/Blue wire from ECM to VSV or faulty ECM.
- If linkage did not move, disconnect vacuum hose at vacuum actuator. Install vacuum gauge and note vacuum reading with engine running. Vacuum reading should be at least 10 in. Hg.
- If vacuum reading is not correct, VSV is defective. If vacuum reading is correct, check for binding linkage or defective actuator.
- Install jumper wire between terminals No. 1 and No. 3 of ALDL connector, located behind right side of instrument panel, near kick panel. See Fig 1
. Apply vacuum and note linkage movement. If linkage did not move, secondary air control system is okay. If linkage moved, proceed to step 8).
- Disconnect electrical connector from VSV. Turn ignition on with engine off. Ensure jumper wire is still installed in ALDL connector. Using test light, check for power between VSV electrical connector terminals.
- If power exists, VSV is defective. If no power exists between connector terminals, check for power between Black/Yellow wire of VSV electrical connector and ground.
- If no power exists, repair open circuit in Black/Yellow wire between VSV and 15-amp engine fuse in fuse block, located behind left kick panel. If power exists, check for open circuit in White/Blue wire between VSV and ECM, defective connections or defective ECM.
Courtesy of GENERAL MOTORS CORP.