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How To Do It!
1) Insert Key (do not turn it)
2) Press and hold the Trip-Meter Reset Button
3) While holding the reset button, start your car and continue holding the button.
4) Within 10 seconds, the display should change to "test" (written in a silly LCD font) and the needles will go nuts. No biggie. Release the Button.
5) Pressing the button will now cycle through some 15 different modes.


It's worth me mentioning that this diagnostic mode is no substitute for taking your car in for service. Many codes found in this mode mean absolutely nothing without other, expensive test equipment at the dealership.

Breakdown of some of the functions:
1 Press - Shows a Gauge Sweep
2 Presses - shows all 8's on the LCD (LCD TEST)
3 Presses - illuminates all the bulbs on the dash
4 Presses - displays hexadecimal value for ROM level
5 Presses - Displays the hexadecimal value for EE level
6 Presses - Shows DTC Troubleshooting Codes (Nothing to worry about though)
7 Presses - DIGITAL SPEEDOMETER - MPH
8 Presses - DIGITAL SPEEDOMETER - KPH
10 Presses - DIGITAL TACHOMETER
For the true hackers out there, the following table shows DTC descriptions. As mentioned before, the codes mean very little. Before tests are run, there's lots of steps that need to be taken. If you suspect something is wrong, have your computer scanned with an OBD-II scanner. Many auto parts stores do this for free. Dealers usually charge for this.
9202    Fuel sender open circuit   
9204    Fuel sender short to ground   
9213    Anti-theft number of programmed keys is below minimum   
A103    Antenna not connected-defective transceiver   
9232    Antenna not connected-defective transceiver   
9317    Battery Voltage high   
9318    Battery voltage low   
9342    ECU is defective   
9356    Ignition run circuit open   
9364    Ignition Start circuit open   
9600    PATS Ignition Key Transponder Signal is Not Received - Damaged Key or non-PATSKey   
9601    PATSReceived Incorrect Key-Code from Ignition Key Transponder (unprogrammed Encoded Ignition Key)   
9602    PATS Received Invalid Format of Key-Code From Ignition Key Transponder (Partial Key Code)   
9681    PATSTranceiver Signal is Not Received (Not Connected, Damaged, or Wiring)   
A139    PCM ID does not match between Instrument Cluster and PCM   
A141    NVM Configuration Failure (No PCM ID exchange between Instrument Cluster and PCM)   
A143    NVM memory failure   
5284    Oil Pressure Switch Failure   
D027    SCP Invalid or Missing Data for Engine RPM   
D041    SCP Invalid or missing data for Vehicle Speed   
D043    SCP Invalid or missing data for Traction Control   
D073    SCP Invalid or missing data for engine coolant   
D123    SCP Invalid or missing data for Odometer   
D147    SCP Invalid or missing data for vehicle security   
D262    Missing SCP message.   

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