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Present Code & Past Code

NOTE: The gateway ECU has the following 2 kinds of DTC. Described as follows are each explanation and dealing method of it's DTC.
  1. Present Code -  While any failure is continuously occurring, DTC is displayed as PRESENT CODE. If PRESENT CODE is displayed, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE INDEX  table.
  2. Past Code -  If no failure occurs presently, even if the customer has experienced failure, DTC is not recorded as PRESENT CODE. However, in some cases, the gateway ECU can record the failures caused by momentary disconnection or occasional failure, as PAST CODE (DTC detected as PAST CODE is all the DTCs in the DTC chart). This is set to help for diagnostic operations. However, no failure has occurred presently, so it is hard to consider the cause being the related part failure. Thoroughly check the wiring connecting each part or the connection failure of the connectors.
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