Dashpot Control System Test
- Engine must be at normal operating temperature. Check idle speed and adjust, if necessary. Remove cap, filter and separator from dashpot.
- Start engine. Maintain engine speed at specified testing RPM. See DASHPOT TESTING RPM table. Plug the Vacuum Transmitting Valve (VTV) hole with your finger.
- Release throttle. Dashpot should be extended and dashpot setting RPM should be as specified. See DASHPOT TESTING RPM table. If idle speed is incorrect, adjust dashpot.
- To check VTV operation, run engine at dashpot testing RPM for a few seconds. Plug the VTV hole with your finger. Release throttle. Uncover plugged hole. Engine should return to idle in about one second.
- Install dashpot separator, filter and cap. Install filter with coarser surface facing outward.
DASHPOT TESTING RPM
| Application |
Testing RPM |
Dashpot Setting RPM |
| 2WD 4A-GE |
2500 |
1800 |
| 4WD 4A-FE |
| Auto. Trans. |
3500 |
2200 |
| Man. Trans. |
3500 |
1800 |
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002