DTC P1682 (LUJ)
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 Control 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.
| 1. |
Ignition ON, observe the DTC
information with a scan tool. Verify DTCs P0685 00, P0689 00, or
P0690 00 are set. |
| 2. |
Ignition ON, observe the scan
tool Engine Control Ignition Relay Feedback signal parameter. The
parameter should display B+. |
| 3. |
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. |
| 4. |
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
| 1. |
Ignition OFF, disconnect the
K20 Engine Control Module connector X1 and the K20 Engine Control
Module connector X2. |
| 2. |
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. |
| 3. |
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 for ECM replacement, setup and
programming
|
