Fuel Cut System
- When checking fuel cut system, engine RPM must be monitored.
- Tachometer is used to monitor engine RPM. For connecting of tachometer, see IDLE SPEED & MIXTURE in ADJUSTMENTS
article.
- Start and warm engine to normal operating temperature. Ensure A/C and all accessories are off. Gradually increase engine RPM to maintain at least specified engine speed. See FUEL CUT SYSTEM TESTING SPECIFICATION table.
FUEL CUT SYSTEM TESTING SPECIFICATION
| Application |
Engine RPM |
| Supra |
3000 |
- Using stethoscope, check for fuel injector operating sound. Ensure when throttle lever is released, fuel injector stops operating momentarily and then resumes operating (fuel return RPM).
- Ensure fuel return RPM is within specification. See FUEL CUT SYSTEM SPECIFICATIONS table. Shut engine off. Remove test equipment.
FUEL CUT SYSTEM SPECIFICATIONS
| Application |
Fuel Return RPM |
| Supra |
1400 |