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Touble codes on my 2010 370z Can anyone help out on this, My Z is in Limp mode. I have changed out computer for the VVEL, still an issue I

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Old 06-21-2021, 01:31 PM   #1 (permalink)
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Default Diagnostic Trouble codes

Touble codes on my 2010 370z

Can anyone help out on this, My Z is in Limp mode. I have changed out computer for the VVEL, still an issue
I see I am having issues with communications
U1000 CAN communications Line Signal Malfunction

M56_AT
U1003 Lost Communications with VVEL control Module
P1606 VVEL Control Module Malfunction
P1421 Cold Start Control

I have taken out and cleaned each fuse and relay under the hood as well with electrical cleaner. Does any one have the 370z grounds diagram?

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Old 06-21-2021, 03:57 PM   #2 (permalink)
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Wiring diagrams, connector pinouts, wire colors, etc are in the FSM. Link in my sig.
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Old 09-21-2021, 08:28 AM   #3 (permalink)
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I have replaced the VVEL module, both relays, cleaned the 2-Cam sensors. Same two codes P1606 and U1003. I am reading about the negative battery post and the screw could be causing the issues. Also consider the ECM was even remapped.
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Old 09-21-2021, 10:55 AM   #4 (permalink)
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Assuming that the replacement VVEL module is good, I would focus on the wiring. Verify the module has 12v on pin 1, 8 and 13 with ignition on, engine off. Make sure to use the ground on pin 14.


Pins 11 and 24 are the dedicated CAN bus that runs from the ECU to the VVEL module.
• With the battery disconnected, the resistance between pins 11 and 24 should be around 60 ohms. This verifies the CAN bus wires and proper bus termination.

• With the battery connected and engine running, check the voltage between pin 11 + 14 (ground) and pin 24 + 14 (ground)

You should see around 2.2V for CAN-Low and 2.7V for CAN-High.
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