INSPECTION OF DP SYSTEM 1. WARM UP ENGINE 2. CHECK IDLE SPEED 3. CHECK DP SETTING SPEED (a) Maintain engine speed at 3,000 rpm. (b) Pinch the vacuum hose between DP and VTV. Pinch VTV Throttle Valve Open 3000 rpm DP Diaphragm EC1217 (c) Release the throttle valve. (d) Check that the DP is set. DP setting speed: 2,000 rpm Pinch Throttle Valve Released 2000 rpm DP Set EC1218 If not at specified speed, adjust with the DP adjusting bolt. DP Adjusting Bolt EC1219 4. CHECK OPERATION OF VTV (a) Set the DP speed in the same procedure as above; (a) to (c). (b) Release the pinched hose and check that the engine returns to idle speed in about 1 second. Released About 1 Second Idle rpm EC1220 IF NO PROBLEM IS FOUND WITH THIS INSPECTION, THE SYS-TEM IS OKAY; OTHERWISE INSPECT VTV