System Inspection

SYSTEM INSPECTION
1. Remove the ECM.




2. Connect the special service tools (SST)s to the engine control module (ECM).
3. Warm up the engine to normal operating temperature and let it idle.




4. With no electrical loads operating, check the torque reduction inhibit signal at the ECM terminal 1 U by using an oscilloscope.
5. If the torque reduction inhibit signal can not be detected, carry out inspection following Symptom Troubleshooting.
- PO100 (Mass air flow circuit malfunction)
- PO1O5 (Manifold absolute pressure/Barometric pressure circuit malfunction)
- PO11O (Intake air temperature circuit malfunction)
- PO115 (Engine coolant temperature circuit malfunction)
- PO120 (Throttle position circuit malfunction)
- P0130, PO134, P0140, PO15O, P0154, P0160 (02 sensor circuit malfunction no activity detected)
- P0335 (Crankshaft position sensor circuit malfunction)
- P111O (Intake air temperature sensor (Dynamic chamber))
6. Lift up the vehicle.
7. Shift the selector lever to D.
8. Depress the accelerator pedal, and verify that the engine speed does not exceed 1,500 rpm.




9. If the engine speed smoothly increase over 1,500 rpm, check the torque reduction request signal at the ECM terminal IQ by using an oscilloscope.
10. Depress the accelerator pedal, and verify that the signal changes as shown in the figure.
11. If there is no change, check the ABS/TCS control unit. 12. Let the engine idle.
13. Check the torque reduction inhibit signal of the ECM terminal 1 U by using an oscilloscope.
14. Disconnect the engine coolant temperature sensor connector, and verify that the signal voltage is 0 V.
15. If not as specified, check the ECM terminal 3Q (Engine coolant temperature sensor) voltage.