Knock Sensor: Testing and Inspection

INSPECTION
The "SCAN" tool will have two positions to check for diagnosing this circuit. Knock signal is used to monitor the input signal from the knock sensor. This position should display "YES" to indicate knock is being detected.
Knock retard is the indication of how much the Electronic Control Module (ECM) is retarding the spark.

Code 43 is designed to diagnose the knock sensor and wiring, so problems encountered with this circuit should set the code. Refer to Computers and Controls / System Diagnosis / Procedures / Diagnostic Charts / Code 43. Testing and Inspection

If no Code 43 was set but the Electronic Spark Control (ESC) system is suspected because detonation was the customer's complaint, refer to Computers and Controls / System Diagnosis / Procedures / Diagnostic Charts / Chart C-5. Testing and Inspection