System Inspection

Using SST-Engine Signal Monitor
1. Remove The ECM.




2. Connect the SST to the ECM.
3. Verify that the engine is cold.
4. Start the engine and hold the engine speed over 3,000 rpm.
5. Measure the voltage at ECM terminals 40 and 4P by using a voltmeter.

Specification: Battery positive voltage

6. Warm up the engine to normal operating temperature and let it idle.




7. Position the vehicle on a chassis roller and shift the selector lever to D.
8. Increase the engine speed over 3,000 rpm and hold it.
9. Measure the voltage at ECM terminals 40 and 4P by using a voltmeter.

Specification: Approx. 11 V

10. Ground ECM terminal 4P by using a jumper wire.
11. Verify that the engine runs roughly or stalls at idle.
12. If not as specified, inspect following:
- ECM terminal 3G voltage (Engine coolant temperature sensor)
- ECM terminal 1 M voltage (Vehicle speed sensor)
- ECM terminal 4E, 4H voltage (Crankshaft position sensor)
- EGR control valve
- EGR solenoid valve (vacuum)
- EGR solenoid valve (vent)
- EGR valve position sensor
- Vacuum hose for damage or looseness

Using SSTs-New Generation Star (NGS) Tester and Engine Signal Monitor
1. Remove the ECM.
2. Connect the engine signal monitor to the ECM.




3. Connect the NGS to the data link connector-2.
4. Verify that the engine is cold condition.
5. Start the engine and hold the engine speed over 3,000 rpm.
6. Measure the voltage at ECM terminals 40 and 4P by using a voltmeter.

Specification: Battery positive voltage

7. Warm up the engine to normal operating temperature and let it idle.
8. Position the vehicle on a chassis roller and shift the selector lever to D.
9. Increase the engine speed over 3,000 rpm and hold it.
10. Measure the voltage at ECM terminals 40 and 4P by using a voltmeter.

Specification: Approx. 11 V




11. Select the SIMULATION TEST function of the NGS.
12. Select "EGRVAC" on the NGS display.
13. Set the duty value at 100%.
14. Verify that the engine runs roughly or stalls at idle.
15. If not as specified, turn off the ignition switch.
16. Turn the ignition switch to ON.
17. Using the SIMULATION TEST function, check the operation sound of the EGR solenoid valve (vacuum, vent).
18. If the operation sound is heard, inspect following:
- ECM terminal 3G voltage (Engine coolant temperature sensor)
- ECM terminal 1 M voltage (Vehicle speed sensor)
- ECM terminal 4E, 4H voltage(Crankshaft position sensor)
- EGR control valve
- EGR valve position sensor
- Vacuum hose for damage or looseness
19. If the operation sound is not heard, inspect the EGR solenoid valve (vacuum, vent).