P0690

DTC P0690

Circuit Description

The ignition 1 relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit, via an internal integrated circuit, called an output driver module. When the ECM commands the relay ON, ignition 1 voltage is supplied to the ECM through the ETC fuse in the underhood fuse block. This ignition 1 voltage input to the ECM provides the ignition power for the electronic throttle control (ETC) circuitry, and is also used to confirm that the ignition 1 relay has closed. A voltage more than 10 volts indicates a short to battery positive voltage in the ignition 1 voltage circuit to the ECM. This DTC will set when the ECM detects more than 10 volts on the ignition 1 voltage circuit to the ECM, after the ignition switch is turned OFF.

Conditions for Running the DTC

The battery voltage is greater than 11 volts for more than 1.5 seconds with the ignition OFF.

Conditions for Setting the DTC

The ECM detects greater than 10 volts on the ignition 1 voltage circuit for more than 125 milliseconds.

Action Taken When the DTC Sets

^ The control module stores the DTC information into memory when the diagnostic runs and fails.
^ The malfunction indicator lamp (MIL) will not illuminate.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
^ The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC

^ A current DTC Last Test Failed clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Clear the DTC with a scan tool.

Diagnostic Aids

^ The ignition 1 relay will remain powered up for 15 seconds after the ignition switch is turned OFF.
^ This diagnostic table assumes that the vehicle battery is fully charged. Refer to Battery Inspection/Test in Engine Electrical.
^ The following underhood fuse block terminal locations correspond to the ignition 1 relay circuits:

- F13--Ignition 1 voltage circuits
- F14--Ignition 1 relay coil control circuit
- H13--Battery positive voltage circuit to the ignition 1 relay coil
- H14--Battery positive voltage circuit to the ignition 1 relay armature