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A diagnostic fault code will remain stored in the memory of the ECU (except for codes No.51 and No.53) until the memory is reset, regardless of whether a continuous fault or intermittent fault caused the code to set. When a malfunction occurs, the "CHECK" engine warning lamp remains illuminated as long as the fault is currently being detected and will go off once normal conditions return. When two or more fault codes are indicated, the lowest number (code) will appear first.Īll detected fault codes, except codes No.51 and No.53 will be retained in memory by the ECU from the time of detection until the memory has been cleared. If any of the previous diagnostic fault codes have appeared, it will indicate that the troubled area has not been repaired sufficiently. In the Instrument Cluster Module, you can display live data and test various instrument cluster functions. Hold Trip Reset while turning ignition key to on position 2. Reset Instrument Cluster The self-test instrument panel Check speed reading TIP Your scanner must be able to perform bi-directional tests to carry out these adaptations. 19 Test Type Instructions to access the hidden functions: 1. If it is necessary to work on any engine components that require removal of the vehicles battery, it is recommended that a diagnostic check is first carried out to identify if any diagnostic fault codes are stored before the ECU memory is cleared.Īfter clearing the memory of the ECU, perform a road test of the vehicle to check that no further malfunctions have been detected and then check that the system normal code is read from the "CHECK" engine warning lamp. Note that there are two different instrument clusters used on the Z3 - the easiest way to tell which you have is by the number of self test modes - the first has the unlock at test 19, the second at 15.
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If diagnostic fault codes are not cleared from memory, they will be retained by the ECU and appear along with any new codes in the event of any future malfunction. In the event of several diagnostic fault codes being stored, the indication will begin from the code with the smaller value and continue in order to the larger.Īfter the diagnostic check has been completed, remove the short between terminals TE1 and E1 of the check connector and turn the ignition switch to the OFF position.Īfter the repair of a troubled area, the diagnostic fault codes retained in memory by the ECU must be cleared by removing the fuse "EFI 15A" for 10 seconds or more, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out) with the ignition switch in the OFF position.Ĭlearing the memory of the ECU can also be done by removing the vehicle battery negative terminal, but in this case, other memory systems (clock, radio etc.) will also be cleared. After all codes have been signaled there will be a 4.5 second pause and then they will be repeated as long as the terminals TE1 and E1 of the check connector are shorted and the ignition switch remains in the ON position.