2005 C6 LS2 Engine Light came on Code P1682
01-12-2018, 06:46 PM
#2
Burning Brakes
Member Since: Sep 2004
Location: Cincinnati OH
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https://www.engine-codes.com/p1682_chevrolet.html
Might give you some info. I've never had to chase down that particular code before so I don't have any specifics.
Looks like others have had that DTC here. Search this forum and you'll have plenty to read.
Might give you some info. I've never had to chase down that particular code before so I don't have any specifics.
Looks like others have had that DTC here. Search this forum and you'll have plenty to read.
Last edited by J.Moore; 01-12-2018 at 06:52 PM.
01-15-2018, 08:21 AM
#3
Safety Car
Member Since: Dec 2006
Location: Pearland / Houston Tx
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Make sure your battery is good and fully charged. Couple relays to check.
Circuit/System Description
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1 voltage circuit is supplied by the run crank relay through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682 will set.
Circuit/System Verification
If DTCs P0685, P0689, or P0690 are set, diagnose those DTCs first.
Important: On the scan tool, the powertrain relay is referred to as the ignition relay.
Ignition ON, engine OFF, observe both the Ignition 1 Voltage signal and the EC Ignition Relay Feedback signal parameters on the scan tool. Both parameter values should display no more than 3 volts difference between the 2 parameters.
⇒ If the vehicle passes the Circuit/System Verification test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records data list.
Circuit/System Testing
Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
Ignition ON, observe the Ignition 1 Signal and the EC Ignition Relay Feedback scan tool parameter to determine which is less than B+.
Ignition OFF, remove the relay that corresponds to the scan tool parameter that is less than B+.
Important: A resistance of 5 ohms or greater in the circuit or underhood fuse block will cause the DTC to set.
Ignition ON, connect a 3A fused jumper wire between B+ and the applicable ignition 1 circuit terminal. Verify that the applicable scan tool parameter displays B+.
⇒ If the applicable scan tool parameter is less than the specified value, test the ignition 1 circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, replace the applicable relay.
Circuit/System Description
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1 voltage circuit is supplied by the run crank relay through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682 will set.
Circuit/System Verification
If DTCs P0685, P0689, or P0690 are set, diagnose those DTCs first.
Important: On the scan tool, the powertrain relay is referred to as the ignition relay.
Ignition ON, engine OFF, observe both the Ignition 1 Voltage signal and the EC Ignition Relay Feedback signal parameters on the scan tool. Both parameter values should display no more than 3 volts difference between the 2 parameters.
⇒ If the vehicle passes the Circuit/System Verification test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records data list.
Circuit/System Testing
Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
Ignition ON, observe the Ignition 1 Signal and the EC Ignition Relay Feedback scan tool parameter to determine which is less than B+.
Ignition OFF, remove the relay that corresponds to the scan tool parameter that is less than B+.
Important: A resistance of 5 ohms or greater in the circuit or underhood fuse block will cause the DTC to set.
Ignition ON, connect a 3A fused jumper wire between B+ and the applicable ignition 1 circuit terminal. Verify that the applicable scan tool parameter displays B+.
⇒ If the applicable scan tool parameter is less than the specified value, test the ignition 1 circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, replace the applicable relay.
The following users liked this post:
Landru (01-15-2018)
01-16-2018, 07:12 PM
#4
Racer
If you love the car, then just get it fixed and enjoy. People get so upset over minor issues. Cars will break, we fix maybe even improve and we go back out and enjoy them even more. Hopefully repair will minor so you will have money for future upgrades. Trust me they're coming.
Last edited by c6crazy; 01-16-2018 at 07:12 PM.
