DTC P1682 - LDE or LLU
Diagnostic Instructions
DTC Descriptor
DTC P1682 00: Ignition 1 Switch
Circuit 2
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Ignition 1 Voltage (Powertrain Relay)
|
P0689 00, P1682 00
|
P0689 00, P1516 00, P1682 00, P2101 00
|
P0690 00
|
-
|
Ignition 1 Voltage (Run/Crank Relay)
|
-
|
P1682 00
|
-
|
-
|
Typical Scan Tool Data
Ignition 1 Signal
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: Ignition ON,
engine OFF. Powertrain ignition relay commanded ON.
|
Ignition 1 Signal
|
0 V
|
0 V
|
B+
|
Engine Controls Ignition Relay Feedback
Signal
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: Ignition ON,
engine OFF. Powertrain ignition relay commanded ON.
|
Engine Control Ignition Relay Feedback Signal
|
0 V
|
0 V
|
B+
|
Circuit/System Description
There are 2 ignition voltage circuits supplied to the
engine control module (ECM). The first ignition circuit is provided
by the powertrain relay, through fuse F10UA 15 A. 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 fuse F5UA 15 A, 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 00 will set.
Conditions for Running the DTC
• |
System voltage is more than 6 V. |
• |
Powertrain relay is commanded ON. |
• |
DTC P1682 00 runs continuously when the
above conditions are met. |
Conditions for Setting the DTC
The ECM detects that the voltage level difference is greater
than 3 V between the 2 ignition voltage circuits for less
than 1 s.
Action Taken When the DTC Sets
DTC P1682 00 is a Type A DTC.
Conditions for Clearing the DTC
DTC P1682 00 is a Type A DTC.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Note: On the scan tool, the
powertrain relay is referred to as the Engine Controls Ignition
Relay.
- Ignition ON, observe the DTC information with a scan
tool. Verify DTCs P0685 00, P0689 00, or
P0690 00 are set.
- Ignition ON, observe the scan tool Engine Control
Ignition Relay Feedback signal parameter. The parameter should
display B+.
- Ignition ON, observe the scan tool Ignition 1
Signal and the Engine Control Ignition Relay Feedback signal
parameters. Both parameters should display within 3 V.
- Operate the vehicle within the conditions for running
the DTC. You may also operate the vehicle within the conditions
that you observed from the freeze frame/failure records data.
Circuit/System Testing
- Ignition OFF, disconnect the K20 Engine Control
Module connector X1.
- Ignition ON, test for B+ between the K20 Engine
Control Module harness connector terminals listed below and
ground.
⇒ |
If less than the specified value, repair the
appropriate ignition voltage circuits for a short to ground or an
open/high resistance. |
- If all circuits test normal, replace the
K20 Engine Control Module.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Control Module References
|