Operator Cab and Controls - Section 32 08/11 OM3212 Page 32-28 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 keyswitch 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 Engine Quantum™ System "Troubleshooting and Repair Manual", Bulletin No. 3666070, or contact an autho- rized repair shop.