Diagnostic trouble code (DTC) information

Condition 

Diagnostic trouble code (DTC) ECM-6B is stored if the air conditioning (A/C) pressure sensor signal is too high or too low.

Substitute Value 

• Air conditioning (A/C) shut off.

Possible Source 

Signal too high: 

• Short-circuit to supply voltage in the signal cable
• Open-circuit in the ground lead
• Contact resistance and oxidation
• Defective air conditioning (A/C) pressure sensor.

Signal too low: 

• Short-circuit to ground in signal cable
• Open-circuit in the signal cable
• Low pressure in the air conditioning (A/C) system
• Contact resistance and oxidation
• Defective air conditioning (A/C) pressure sensor.

HINT: A diagnostic trouble code (DTC) may be stored at low temperatures despite the absence of any faults. 

Fault symptom[s] 

• The air conditioning (A/C) system does not operate.