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Consider substituting a known working ECU that is compatible with your van if you are unable to locate the problem it is also possible to test the ECU itself with the aid of the Factory Service Manual and/or Electrical Wiring Diagram manual specific to your van’s model year.Īll ECUs have the part number on the case use the part numbers below to assess possible compatibility. Jump DLC terminals T and E1 with a short lead 1 Count MIL flashes and compare with. Further information concerning these codes can be found in the following manuals: 7FBCU15-55 OPSS Manual CU335 page 3-9 7FBEU15-20 OPSS Manual CU341 page 1-10 7FGCU15, 18, S20 OPSS Manual CU042 page 1-19 7FGU15-32, 7FDU15-32, 7FGCU20-32 OPSS Manual CU040 page 1-18 7FGU35-80, 7FDU35-80, 7FGCU35-70 OPSS Manual CU041 page 1-17 8FGCU15, 18, S20 Service manual 00700-X8880-71 page 19.1-82 8FGU15-32. For all problems and codes, it is possible (although highly uncommon) for an internal ECU malfunction to be the source of the trouble code.To verify that a trouble area has been successfully repaired, you will need to clear the codes (see above) and run the engine (and possibly road test the van, depending on the exact malfunction) before checking for codes again.Lower temperatures require longer disconnect times. Toyota states “30 seconds or longer depending on the ambient temperature,” for the 3Y vans, but only “10 seconds or longer depending on the ambient temperature” for the 4Y vans. To clear codes from the ECU’s memory after a repair, remove the EFI fuse ( click here to locate) with the ignition switch off OR disconnect the battery.For an example of how the "check engine" light behaves when a van is throwing two codes, click here.For all vans, a steady blinking light (single blink) is your verification that the diagnostic system is functioning and has no stored codes.
#88 toyota diagnostic codes how to#
To learn how to check your van for stored trouble codes, click here.