P1600 - ECM BATT MALFUNCTION

[absalom]

2000 Cruiser with immobilizer bypass mod installed approx 3 months ago. The light came on this morning after my brother pulled the battery to jump another car.

Where do I check first? Is this related to the bypass? Code won’t clear with TechStream.

 

[Guido02]

2000 Cruiser with immobilizer bypass mod installed approx 3 months ago. The light came on this morning after my brother pulled the battery to jump another car.

Where do I check first? Is this related to the bypass? Code won’t clear with TechStream.

Anyone have any luck with this? I’m having the same issue.

 

[BullElk]

Same issue with p1600 here. Any ideas as I search?

 

[kevgentile]

Check out DI-279 and DI-280 of the manual. It goes through the necessary voltage checks at the ecm.
You should be getting a constant batt voltage with key out/off. You'll want to back probe the terminal while connected to the ecm.
I believe it's connector/pin E(9)-1.
-Voltage ok (9-14v) = bad ecm
-Voltage ng = efi 20 amp circuit short/fault

A bit of a pain to meter since they didn't leave a lot of wiggle room with the harness while connected to the ecm, and you'll need a small gauge pin to fit in the backside of the connector.