Signal Too High - Intermittent Fault

ECM-2A0A REAR HEATED OXYGEN SENSOR (HO2S)
SIGNAL TOO HIGH - PERMANENT FAULT

Checking cables




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

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 short-circuit to supply voltage 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.