Operation - Section 32 OM3223 Page 32-26 Operator Cab and Controls 2. Turn the key switch to the ON position (engine not on) and press lamp test switch to the bottom ( position for one - two seconds, then release (switch is spring-loaded to the top, OFF posi- tion). NOTE: Since this is the lamp test switch, all red warning lights and amber indicator lights should light up except those that are blank. The warning horn will also sound. 3. If there is an active fault after releasing the switch, there will be a short pause, followed by the first fault code. 4. Pressing the lamp test switch to the bottom ( ) again will advance to the next fault code (if more than one code is present).
Once all active fault codes have been displayed, the fault code display sequence will be repeated, starting from the first fault code. EXITING THE DIAGNOSTICS MODE Starting the engine or turning the key switch to the OFF position will exit the diagnostics fault flash mode. If active fault codes have been determined as described previously, refer to the Cummins Centry System Troubleshooting and Repair Manual, Bulletin No. 3666070, or contact an Authorized Repair Loca- tion.