DTC EFI-211

2-1-1 CO POTENTIOMETER

Trouble Code Condition(s)
Diagnostic trouble code (DTC) EFI-211 CO potentiometer is stored if the voltage in the CO potentiometer signal cable is too high (above 4.8 Volts) or low (under 0.2 Volts).

Substitute value(s)
- None.

Possible source(s)
Signal too high:
- Short-circuit to supply voltage in the signal cable.
- Open-circuit in signal cable, ground lead or power cable.
- Short-circuit to ground in air conditioning (A/C) pressure sensor.
- Short-circuit to ground or supply voltage in power cable.
- Contact resistance in terminals.
- CO potentiometer incorrectly adjusted.
- Defective CO potentiometer.

Signal too low:
- Short-circuit to ground in signal cable.
- CO potentiometer incorrectly adjusted.
- Defective CO potentiometer.

Fault symptom(s)
- May result in poor performance.