• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Ignition 1 Voltage, Powertrain Relay | P0689 | P0689, P1682 | P0690 | -- |
Ignition 1 Voltage, Run/Crank Relay | -- | P1682 | -- | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON, engine OFF, and run/crank and powertrain relay are commanded ON | |||
Ignition 1 Voltage, Run/Crank | 0 Volts | 0 Volts | B+ |
EC Ignition (Powertrain) Relay Feedback Signal | 0 Volts | 0 Volts | B+ |
There are 2 ignition voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the engine controls ignition relay or main relay, through a fuse. This ignition voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 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 voltage circuits, DTC P1682 will set.
• | The ignition is ON. |
• | System voltage is more than 6 volts. |
• | The powertrain relay is commanded ON. |
• | DTC P1682 runs continuously. |
The ECM detects that the voltage level difference is greater than 3 volts between the 2 ignition voltage circuits for less than 1 second.
DTC P1682 is a Type A DTC.
DTC P1682 is a Type A DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If any of the above DTCs are set, refer to DTC P0685, P0689, or P0690 for further diagnosis. |
⇒ | If less than the specified value, refer to DTC P0685, P0689, or P0690 for further diagnosis. |
• | X1-12 |
• | X1-14 |
⇒ | If less than the specified value, repair the appropriate ignition voltage circuits for a short to ground or an open/high resistance. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming