T100 Pickup 4WD V6-180.5 2959cc 3.0L SOHC (3VZ-E) (1993)
Knock Sensor: Testing and Inspection
INSPECTION
1. Warm-up engine to normal operating temperature.
2. Attach a timing light with advance indicator and a tachometer. Locate the Knock Sensor connector (on the left side of the intake plenum) and
ensure that the connector is secure.
Tachometer Hookup
3. While operating the engine at 2,000 rpm, check the ignition spark advance and calibrate the timing mark to 0° Top Dead Center.
4. Using a wrench or small hammer, tap the exhaust manifold and observe the timing marks.
5. The ignition timing mark should move in the retard direction, depending on the intensity and speed of the tapping.
6. If the timing mark does not retard, turn the engine off and check the wiring between the Knock Control Sensor and the Engine Control Module
(ECM).
7. If no problems are found, replace the Knock Control Sensor and repeat test procedure.
8. If timing still does not retard, replace the ECM and repeat the test procedure.
9. Disconnect timing light and tachometer from the engine.