Signal Missing - Intermittent Fault

ECM-280A FRONT HEATED OXYGEN SENSOR (HO2S), FAULTY SIGNAL
SIGNAL MISSING - INTERMITTENT FAULT

Checking cables




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

Check signal cable (+) between Heated Oxygen Sensor (HO2S) # 1 and control module # A41 (# A41) and signal cable (-) between Heated Oxygen Sensor (HO2S) # 5 and control module # A42 (# A42) for an intermittent short circuit to each other according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check the power supply to Heated Oxygen Sensor (HO2S) # 3 and the signal cable between Heated Oxygen Sensor (HO2S) # 4 and control module # A18 (# A18) for an intermittent short-circuit to the Heated Oxygen Sensor (HO2S) other wiring 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)
- 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.