Diagnostic Aids

An intermittent Code P1626 or P1629 and/or a possible no-start may be caused by the following.

• Loss Of Power Or Ground To Theft Deterrent Module:
  
  A loose ground or poor ignition or battery condition could cause an intermittent loss of the PASS-Key II fuel enable signal and Codes P1626 and P1629 to be set.
• Dirty, Damaged, Or Loose Connections Or Damaged Harness:
  
  Check for any damage to harness which could cause an intermittent open or short to ground, backed out terminals at PCM and theft deterrent module connectors, broken locks, improperly formed or damaged terminals.

Fig 1: Code P1626A/P1629 Schematic (3.8L) Pass-Key II Fuel Enable Circuit

Fig 2: Code P1626A/P1629 Flow Chart (3.8L) Pass-Key II Fuel Enable Circuit

Fig 3: Code P1626A/P1629 Flow Chart