Diagnostic trouble code (DTC) informationECM-1300: Notes

Condition

Fig 1: Identifying Mass Air Flow (MAF) Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

If Engine control module (ECM) registers that the air mass, which is measured with the mass air flow sensor, is higher than the upper limit value or lower than the lower limit value for longer time than 10 seconds, then diagnostic trouble code ECM-1300, Too high flow or too low flow, is stored. The upper and lower limit value are calculated continuously by the Engine control module (ECM), the values vary with the throttle's position and the engine's RPM.

For upgraded software, released during year 2006 or later, adjustments have been made to the above limit values to cover the errors diagnostic trouble code ECM-130A took care of in earlier software.

See Identifying upgraded software ECM/ETM

Substitute Value

initial boost pressure
rear heated oxygen sensor (HO2S) control shut off
misfire diagnosis shut off

For upgraded software, released in 2006 or later, adjustments have been made to substitute values. In the driving cycles where the fault is active, except the above replacement values, then fuel shut-off which also follows the accelerator pedal position will be active and it will not be able to activate cruise control.

See Identifying upgraded software ECM/ETM

Fuel cut-off that follows accelerator pedal position.

Engine speed is regulated via fuel cut-off by deactivating the injectors one at a time. Engine speed is determined by gas pedal position sensor position and engine speed is maximized to about 5000 RPM. This reconfiguration can cause the engine to idle very unevenly since the engine control module (ECM) regulates engine speed by cutting of the fuel to the cylinders individually. Do not confuse this reconfiguration (engine behavior) with an actual driveability problem that was present before reconfiguration.

Cruise control off.

Cruise control off during entire operating cycle in which fault was detected. If the fault is no longer present, the function is available the next time the car is started.

Possible Source

Flow too high:

short-circuit to supply voltage in the signal cable
open-circuit in the ground lead
defective sensor

Flow too low:

air leakage
contact resistance
short-circuit to ground in the signal cable
open-circuit in signal cable
open-circuit in power supply cable
defective sensor

Fault symptom[s]

poor performance