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Status Identifier, Description

Status identifier 
There are different status identifiers that can be read off for each diagnostic trouble code (DTC). The control module tests each terminal almost continuously. By reading off the diagnostic trouble code (DTC) and the associated status identifier (which detects the fault and stores the DTC), information about the test is obtained. Not all status identifiers need to be implemented in one control module. This varies from system to system. All status identifiers are reset and start counting again each time the control module is powered up and when erasing diagnostic trouble codes (DTCs). The possible status identifiers are described below.
Status identifier  Explanation 
Upper graph When the signal value is above or below a maximum or minimum value that is considered to be a fault by the control module, an instantaneous fault is registered (i. e. a fault is active). The value may vary depending on the specific diagnostic trouble code (DTC). Examples of this are U > 11.5 V, U < 2 V or f < 10 Hz.
SI#01 (see the graph) The test is active. The control module can only detect faults and store diagnostic trouble codes (DTC) when the test is running.
SI#02 (see the graph) The test has been active. Indicates whether the control module was able to detect faults and store diagnostic trouble codes (DTC).
SI#03 (see the graph) The control module detects an instantaneous fault. This information is used by the control module to determine if or when a diagnostic trouble code (DTC) should be stored. As soon as a signal exceeds the permitted value (compare with the upper graph), there is an instantaneous fault.
SI#04 (see the graph) The control module has detected an instantaneous fault. An instantaneous fault has been detected at some stage.
SI#05 Lamp lighting / Text message. Information about whether the diagnostic trouble code (DTC) activates a warning lamp or text message in the combined instrument panel.
SI#06 The test is disabled because another fault has occurred. The diagnostic trouble code (DTC) is stored at the point of the base fault. If this leads to further faults, related diagnostic trouble codes (DTCs) are not stored.
SI#08 (see the graph) Counter for instantaneous faults. When an instantaneous fault is detected by the control module, a counter counts up for as long as the fault exists. When the fault is no longer present, the counter counts down again. The diagnostic trouble code (DTC) is stored in the car if the counter reaches a certain maximum value. The maximum value varies between different diagnostic trouble codes (DTCs). The speed of the count depends on how long the fault can persist before it results in customer symptoms.
SI#09 (see the graph) Maximum value of counter SI#08. There are a variety of ways that the counter value for instantaneous faults can be read off depending on how often the diagnostic has been run.
Lower graph Validating diagnostic trouble codes (DTCs). The diagnostic trouble code (DTC) is stored when the counter for instantaneous faults has reached its maximum value.
Fig 1: Status Identifier Graph
GLL101088Courtesy of VOLVO CARS CORPORATION
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