Signal Too High - Intermittent Fault

ECM-3420 KNOCK SENSOR (KS) REAR
SIGNAL TOO HIGH - INTERMITTENT FAULT

Checking cables



Check signal cable between Knock Sensor (KS) # 3 and control module # A45 (# A45) and ground lead between Knock Sensor (KS) # 4 and control module # A67 (# B7) for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check that the Knock Sensor (KS) is tightened to the correct torque.

Hint: The Diagnostic Trouble Code (DTC) may be caused by a worn engine. Start the engine and listen for discordant noise.

Other information
- Connecting the breakout box/accessing the control module Connecting the Breakout Box (ECM)
- To access/replace the knock sensor (KS), Knock Sensor, Replacing
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.