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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P1631: Theft Deterrent Start Enable Signal Incorrect ("Y" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Unless sent here after replacing PCM, check for any BCM DTCs being set. If a BCM DTC is set, diagnose DTC. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If T-50/T-60 scan tool is being used, go to step  5. If T-50/T-60 scan tool is not being used, go to next step.
  3. If Tech 2 scan tool is being used, go to step  6. If Tech 2 scan tool is not being used, go to next step.
    NOTE: While PCM is in Auto Learn Procedure, battery voltage must be maintained at all times. This procedure must be followed exactly or procedure will have to be repeated from beginning. Performing following procedures will set DTC P1630. Turn ignition off for 30 seconds, then turn ignition DTC P1630 should clear. If DTC P1630 does not clear, diagnose DTC P1630.
  4. Turn ignition on, with engine off for 11 minutes. Turn ignition off for 30 seconds. Repeat turning on ignition for 11 minutes, and turning it off for 30 seconds 2 times. Turn ignition on, with engine off and wait 30 seconds. Attempt to start engine. If engine starts and operates normally, go to step  7. If engine does not start or operate normally, go to step  8.
    NOTE: Performing the following procedures will set DTC P1630. Turn ignition off for 30 seconds, then turn ignition on. DTC P1630 should clear. If it does not, diagnose DTC P1630.
  5. Using T-50/T60 scan tool, enter SERVICE PROGRAMMING SYSTEM. Select TERMINAL-TO-VEHICLE PROGRAMMING. Select DONE and follow instructions on VEHICLE SETUP screen. Select VEHICLE THEFT RELEARN. Follow instructions on remaining screens. PCM and BCM will be prepared for relearn. A security timer will be on for about 11 minutes or DTC P1630 sets. Keep terminal connected to vehicle during 11 minute period. When BCM and PCM are prepared to relearn, turn ignition off for 30 seconds and attempt to start engine. If engine starts and operates normally, go to step  7. If engine does not start or operate normally, go to step  8.
    NOTE: Performing the following procedures will set DTC P1630. Turn ignition off for 30 seconds, then turn ignition on. DTC P1630 should clear. If it DTC does not clear, diagnose DTC P1630.
  6. Using Tech 2 scan tool, enter SERVICE PROGRAMMING SYSTEM. After keying vehicle information, select REQUEST INFO key. Select DONE and follow instructions on VEHICLE SETUP screen. Disconnect scan tool from vehicle and connect it to Techline terminal. At Techline terminal, select SERVICE PROGRAMMING SYSTEM. Select TERMINAL-TO-TECH 2 PROGRAMMING. Select DONE. Follow instructions on remaining screens. Select VEHICLE THEFT RELEARN. Select PROGRAM. Return scan tool to vehicle and connect to DLC. Select SERVICE PROGRAMMING SYSTEM. After keying vehicle information, select REQUEST INFO key. Select THEFT RELEARN. Follow instructions on remaining screens. PCM and BCM will be prepared for relearn. A security timer will be on for about 11 minutes or DTC P1630 sets. Keep terminal connected to vehicle during 11 minute period. When BCM and PCM are prepared to relearn, turn ignition off for 30 seconds and attempt to start engine. If engine starts and operates normally, go to next step. If engine does not start or operate normally, go to step  8.
    NOTE: Before clearing DTCs, monitor all DTC status parameters and note any additional DTCs.
  7. Using scan tool, clear PCM DTCs. Turn ignition off for 30 seconds. Attempt to start engine. If engine starts and operates normally, system is okay. If engine does not start and run, go to next step.
  8. Using scan tool, read DTCs. If DTC P1626, P1630 or P1631 is set, diagnose affected DTC(s). If DTC P1631 resets, return to step  2.
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