P1629

Description
THEFT DETERRENT CRANK SIGNAL MALFUNCTION

Vehicle operation is disabled if incorrect key or starting
procedure is used. Vehicle Theft Deterrent (VTD) module enables crank
circuit to starter and sends a signal to PCM if correct key is being
used. If proper signal does not reach PCM fuel enable signal circuit,
PCM will not pulse injectors on, disabling vehicle, even if crank
circuit is by-passed. Signal should be between 40-60 Hz and is
measured using DC scale on DVOM.

Symptoms
Engine will not run

Causes

• PCM detects incorrect signal on theft deterrent fuel enable
  circuit.

Solutions

• Check for faulty connection at TDS module.
• Bypass VATs(92-99 only)
• Replace VTD module.