2001 Freightliner Truck, Still Runs When Key Shut Off

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bat9905

Copper - Posts: 131

Joined: January 13, 2008

Location: Washington, United States

Posted: January 13, 2022 at 10:09 PM / IP Logged

Hi have an issue and need a little help. I have an 01 freightliner with a simple 4 wire ignition switch. Constant 12 volt, acc, starter (push button) and ign have 12 volt proper key positions but vehicle still runs when key is shut off. Metering ignition while key is on 14 volts is present. Shut key off and it drops to 12. It should drop to 0 of course. I suspect ecm issue or something related because when I pull ecm fuse it shuts off. Any solutions would be greatly appreciated. Could a diode fix this temporarily?

bat9905

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i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: January 14, 2022 at 7:31 AM / IP Logged

Any recently installed aftermarket equipment?

Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

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bat9905

Copper - Posts: 131

Joined: January 13, 2008

Location: Washington, United States

Posted: January 14, 2022 at 6:12 PM / IP Logged

Just a pioneer head unit

bat9905

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i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: January 14, 2022 at 7:50 PM / IP Logged

Does the radio turn off when you turn the key off?

Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

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bat9905

Copper - Posts: 131

Joined: January 13, 2008

Location: Washington, United States

Posted: January 15, 2022 at 11:54 AM / IP Logged

Yes it shuts off acc wire at the switch is off when key is off.

bat9905

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bat9905

Copper - Posts: 131

Joined: January 13, 2008

Location: Washington, United States

Posted: January 19, 2022 at 9:26 PM / IP Logged

Ignition relay ended up being bad and back feeding to switch

bat9905

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i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: January 19, 2022 at 9:45 PM / IP Logged

Thanks for letting us know what it was. It may help somebody else with the same problem down the road.

Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

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