Signal Missing - Intermittent Fault

ECM-3100 ENGINE SPEED (RPM) SENSOR
SIGNAL MISSING - INTERMITTENT FAULT

Checking connector and wiring



Check engine speed (RPM) sensor connector for intermittent contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check the signal cable between the engine speed (RPM) sensor # 1 and the Engine Control Module (ECM) # A48 (# A48) and between the engine speed (RPM) sensor # 2 and the Engine Control Module (ECM) # A66 (# B6) for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults, an intermittent short-circuit to ground according to [1][2]Checking Wiring and Terminals. Intermittent Faults and an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check the carrier plate, search for damage and other defects.

Remedy as necessary

Other information
- Connecting the breakout box/accessing the control module Connecting the Breakout Box (ECM)
- To access/replace the engine speed (RPM) sensor, Engine Speed (RPM) 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.