no spark. changed to igniter, relay and distributor as an assembly. It has plenty of fuel at rail and still no spark. Help!
Nov 20, 2019 at 4:52 PM
p1600 error code
1997 GEO PRIZM
CHRISTOPHER SHANE BRIAN
- MEMBER
- 11 POSTS
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JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,193 POSTS
Hi,
The code indicated keep alive battery voltage to the ECM is lost. Battery positive voltage is supplied to the ECM even when the Ignition switch is off. For this code to set, you have an open or short in the back up power source circuit.
I attached a schematic for the system. You will need to check connections at the ECM for damage, pushed in pins, corrosion, and that it is tight. Next, picture 2 and 3 are a flow chart to help locate the problem specific to this code. Interestingly, if this code is set, no other codes will be indicated.
Please keep in mind, the ECM itself may have failed.
_____________________________
Take a look through the flow chart and let me know if it helps or if you have other questions. Keep in mind, the ECM sends out a 2 volt pull up on the brake signal circuit. If there is power lost to that circuit, it can cause the issue.
The code indicated keep alive battery voltage to the ECM is lost. Battery positive voltage is supplied to the ECM even when the Ignition switch is off. For this code to set, you have an open or short in the back up power source circuit.
I attached a schematic for the system. You will need to check connections at the ECM for damage, pushed in pins, corrosion, and that it is tight. Next, picture 2 and 3 are a flow chart to help locate the problem specific to this code. Interestingly, if this code is set, no other codes will be indicated.
Please keep in mind, the ECM itself may have failed.
_____________________________
Take a look through the flow chart and let me know if it helps or if you have other questions. Keep in mind, the ECM sends out a 2 volt pull up on the brake signal circuit. If there is power lost to that circuit, it can cause the issue.
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Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Click here to log in and view diagram.
Nov 20, 2019 at 9:03 PM
Thanks, I will respond ASAP.
Nov 21, 2019 at 8:07 PM
JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,193 POSTS
Happy to help. Let me know what you find.
Take care,
Joe
Take care,
Joe
Nov 21, 2019 at 8:41 PM
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