I take it you mean the error codes (rather than diagnostic?)

The error codes are:

12 = Crankshaft position sensor
13 = Air intake pressure sensor (short or open circuit)
14 = Air intake pressure sensor (malfunction)
15 = Throttle position sensor (short or open circuit)
16 = Throttle position sensor (stuck)
19 = Broken or disconnected blue/black lead to ECU
21 = Coolant temperature sensor
22 = Air intake temperature sensor
24 = O2 sensor (<2007 models)
30 = Lean angle cut-off switch (latch-up)
31 = O2 sensor detects continually lean A/F ratio (<2007 models)
32 = O2 sensor detects continually rich A/F ratio (<2007 models)
33 = Faulty ignition
41 = Lean angle cut-off switch (open circuit)
42 = Speed sensor/neutral switch
43 = Fuel system voltage (ECU unable to monitor)
44 = Error writing CO to EEPROM
46 = Fuel system power supply not normal
50 = ECU internal malfunction

Er-01/Er-02/Er-03/Er-04 = No/unreadable communication with ECU, no dash to ECU communication, wiring fault, ECU fault, dash fault

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