Signal Missing - Intermittent Fault

ECM-2A0A REAR HEATED OXYGEN SENSOR (HO2S)
SIGNAL MISSING - INTERMITTENT FAULT

Checking cables and connectors




CAUTION!
Do not apply rust solvent spray or grease to the Heated Oxygen Sensor (HO2S) connector.

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

Check the signal cable (+) between Heated Oxygen Sensor (HO2S) # 4 and control module # A61 (# B1) and the signal cable (-) between Heated Oxygen Sensor (HO2S) # 3 and control module # A62 (# B2) 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.