2002 Chevrolet Tracker ZR2 P0601 Code: No Spark, 10-Amp Draw Diagnosis

Hi everyone, I'm fairly experienced with automotive diagnostics, but this 2002 Chevrolet Tracker ZR2 (2.5L V6) has me stumped. The vehicle was parked overnight and the next morning I found the battery completely dead. I used a jump pack to start it — the engine turned over fine, but there was no spark at the plugs. All fuses have been checked and appear to be in order. However, I discovered a persistent 10-amp draw when the negative cable is connected and nothing is powered (no key in ignition, no systems on). I isolated all fuses, but the draw remains unchanged. I also tried removing each wire connected to the ECM — the current didn't drop, suggesting the issue isn or within the ECM itself. The vehicle now displays a P0601 fault code (Fuel Pressure Regulator Control Circuit Malfunction). While I suspect the ECM might be misconfigured or require reprogramming, this doesn’t explain why it wouldn’t start initially — especially before disconnecting the ECM. My questions are: - What could cause the engine to fail to fire (no spark) in this scenario? - Could a faulty crankshaft or camshaft position sensor be responsible? - What might cause that 10-amp draw? Are aftermarket components like an alarm, radio, or remote starter a likely culprit? If I don’t get a response soon, please feel free to contact me at Snyder_auto @ yahoo. Thanks in advance for any insight!