When Idling Can Be Continued

Right Bank

1. Disconnect right side Oil Control Valve (OCV) connector.
2. Warm up engine and let idle.
3. Apply battery voltage to OCV and verify engine idles roughly or stalls.
   • If engine idles roughly or stalls, inspect timing belt component (valve timing deviation).
   • If engine does not idle roughly or stalls, go to next step.
4. Remove right side OCV and perform spool valve operation inspection. Refer to OIL CONTROL VALVE - MAZDA6 & MIATA ONLY under VARIABLE VALVE TIMING CONTROL in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If not as specified, inspect following:
   • Right side OCV
   • Harnesses and connectors between right side OCV and PCM for open or short circuit

   If as specified, inspect following hydraulic passages for clogging or leakage or both

   • Oil pressure switch to OCV
   • OCV to camshaft
   • Camshaft internal passage

5. If all passages are okay, replace right side camshaft pulley (with built-in variable valve timing actuator).

Left Bank

1. Disconnect left side Oil Control Valve (OCV) connector.
2. Warm up engine and let idle.
3. Apply battery voltage to OCV and verify engine idles roughly or stalls.
   • If engine idles roughly or stalls, inspect timing belt component (valve timing deviation).
   • If engine does not idle roughly or stalls, go to next step.
4. Remove left side OCV and perform spool valve operation inspection. Refer to OIL CONTROL VALVE - MAZDA6 & MIATA ONLY under VARIABLE VALVE TIMING CONTROL in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If not as specified, inspect following:
   • Left side OCV
   • Harnesses and connectors between left side OCV and PCM for open or short circuit

   If as specified, inspect following hydraulic passages for clogging or leakage or both

   • Oil pressure switch to OCV
   • OCV to camshaft
   • Camshaft internal passage

5. If all passages are okay, replace camshaft pulley (with built-in variable valve timing actuator).