Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying ECM, Instrument Panel And Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) CI-08 is stored in the combined instrument panel if the fuel consumption signal increases in the combined instrument panel at the same time as the engine speed (RPM) signal from the engine control module (ECM) is lower than 150 RPM.

Substitute Value 

None.

Possible Source 

• short-circuit to ground in the signal cable
• short-circuit to supply voltage in the signal cable
• open-circuit in the signal cable
• defective engine control module (ECM) (does not apply to Melco2)
• defective combined instrument panel
• defective ignition sensor
  NOTE: In cars with the Melco 2 engine management system, the engine speed (RPM) signal comes directly from the ignition sensor in the engine management system.
• open-circuit, short-circuit to ground or short-circuit to supply voltage in the signal cable for the engine control module (ECM) or ignition sensor.

  Diagnostic trouble codes (DTCs) are stored in the engine control module (ECM) if there is a fault in the ignition sensor. These diagnostic trouble codes (DTCs) must be fault-traced first.

Fault symptom[s] 

• tachometer not working.