Signal Missing - Intermittent Fault

ECM-2810 FRONT HEATED OXYGEN SENSOR (HO2S), PREHEATING
SIGNAL MISSING - INTERMITTENT FAULT

Checking cables and connectors



Check Heated Oxygen Sensor (HO2S) connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Intermittent Faults and loose connections according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check signal cable between Heated Oxygen Sensor (HO2S) # 4 and control module # A18 (# A18) and power supply between system relay # 3 and Heated Oxygen Sensor (HO2S) # 3 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Other information
- Connecting the breakout box/accessing the control module Connecting the Breakout Box (ECM)
- To access/replace the heated oxygen sensor (HO2S), Adapter Wiring Switch, 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.