Test G: Unprogrammed Encoded Ignition Key (KEYCODE Format Okay)

NOTE: After any repairs, perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK - EXCURSION & F250/F350 SUPER DUTY article.

NOTE: DTC B1601 is stored when a key that is not programmed into PATS control module memory has been used. This indicates key needs to be programmed into PATS control module memory. PCM will disable engine for 20 seconds every time DTC B1601 is set. Ignition switch must remain in RUN position for 20 seconds before another attempt is made to restart vehicle with an encoded ignition key. Use scan tool to check PCM PID ANTISCAN for this unprogrammed key time-out status.

NOTE: Large metallic objects, electronic debit transponder devices or another encoded key on same key ring as PATS ignition key, may cause vehicle starting problems and record DTCs under certain conditions. If a fault cannot be identified, check key ring for these items. These items should be kept from touching PATS ignition key while starting engine. These items will not damage PATS ignition key, but can cause a momentary problem if they are too close to PATS ignition key during engine start. If a problem occurs, turn ignition off and restart engine with all other items on key ring held away from PATS ignition key.

Turn ignition switch to LOCK position. Using scan tool, retrieve and record all DTCs. Clear continuous DTCs. Perform PATS self-test, then retrieve PATS DTCs. If DTC B1601 is retrieved, go to next step. If DTC B1601 is not retrieved, PATS is okay. Ensure all other encoded ignition keys are programmed. See KEY PROGRAMMING - ERASE ALL KEYS & PROGRAM 2 KEYS under PROGRAMMING.
Using scan tool, read PID NUMKEYS. If PID NUMKEYS displays any number other than 8, go to next step. If PID NUMKEYS display is 8, erase and reprogram all keys. See KEY PROGRAMMING - ERASE ALL KEYS & PROGRAM 2 KEYS under PROGRAMMING.
Ensure at least 2 programmed encoded ignition keys are available, then go to next step. If there are not at least 2 keys available, cut and program new key(s). See KEY PROGRAMMING - ERASE ALL KEYS & PROGRAM 2 KEYS under PROGRAMMING, then go to step 5 .
Using scan tool, read PID SPARE_KY. If PID SPARE_KY displays ENABLED, perform KEY PROGRAMMING - WITH PROGRAMMED KEYS under PROGRAMMING, then go to next step. If PID SPARE_KY displays DISABLED, enable using procedure in KEY PROGRAMMING - SPARE KEY PROGRAMMING SWITCH under PROGRAMMING, then go to next step.
Start then turn off engine using first encoded ignition key. Start then turn off engine using second encoded ignition key. If engine does not start using both encoded ignition keys, go to next step. If engine starts using both encoded ignition keys PATS is okay. If any additional keys need to be programmed see KEY PROGRAMMING - WITH PROGRAMMED KEYS under PROGRAMMING.
Using scan tool, retrieve and record all DTCs. Clear continuous DTCs. Perform PATS self-test using both keys used in step 5 , then retrieve PATS DTCs. If DTC B1601 is not retrieved, PATS is okay. If other PATS DTCs are retrieved perform appropriate test. See PATS DIAGNOSTIC TROUBLE CODE INDEX table under SELF-DIAGNOSTIC SYSTEM. If DTC B1601 is retrieved, replace PATS control module. PASSIVE ANTI-THEFT SYSTEM CONTROL MODULE under REMOVAL & INSTALLATION. Using 2 encoded ignition keys, turn ignition switch to RUN, then LOCK position. Go to TEST J: PCM ID DOES NOT MATCH BETWEEN PASSIVE ANTI-THEFT SYSTEM CONTROL MODULE & PCM .