DTC P081A or P081B
Diagnostic Instructions
DTC Descriptors
| DTC P081A: Brake Transmission Shift Interlock
Solenoid Actuator - Short to Ground/Open |
| DTC P081B: Brake Transmission Shift Interlock
Solenoid Actuator - Short to Voltage |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Signal
|
P081A
|
P081A
|
P081B
|
-
|
|
| |
Circuit/System Description
The transmission range switch is an integral part of the
transmission control module (TCM). As the gear range selector lever
is moved, the state of the starter inhibit circuit may change,
causing the circuit to open or close. An open circuit indicates a
drive range and a low voltage signal, 0 V, at the body control
module (BCM). A closed circuit indicates PARK or NEUTRAL and a high
voltage, 12 V, signal at the BCM. The BCM uses the starter inhibit
circuit status from the TCM in order to enable starter
operation.
Conditions for Running the DTC
P081A, P081B
| • |
The ignition voltage is
9.0-18.0 V. |
| • |
The transmission is not in
emergency mode. |
Conditions for Setting the DTC
P081A
| • |
Start lock output is "On" and
start lock monitor signal indicates "Off" for more than 10
ms. |
| • |
After consecutive 2 times of
above detection. |
P081B
| • |
Start lock output is "Off" and
start lock monitor signal indicates "On" for more than 100
ms. |
| • |
After consecutive 2 times of
above detection. |
Action Taken When the DTC Sets
P081A
| • |
DTCs P081A and P081B are Type
D DTCs. |
| • |
No engine start
possible. |
Conditions for Clearing the DTC
P081A
| • |
DTCs P081A and P081B are Type
D DTCs. |
| • |
Start lock output is "On" and
start lock monitor signal indicates "On" and/or start lock output
is "Off" and start lock monitor signal indicates "Off" for more
than 1 s. |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Description and Operation
Transmission Component and System Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
The engine has to start in
range position P and N. |
| 2. |
The engine must not start in
all other range positions. |
Circuit/System Testing
Dynamic Test
Ignition ON, observe the scan tool Transmission Range Switch
parameter while selecting each transmission range: P, R, N, D. Each
selected transmission range should correspond to the correct scan
tool parameter displayed.
If not equal to the specified range, test the starter inhibit
circuit for a short to ground, an open/high resistance, or a short
to voltage. If the circuit test normal, replace the TCM.
Component Testing
Static Test
| 1. |
Ignition OFF, remove the
wiring harness connector from K71 Transmission Control
Module. |
| 2. |
Test the starter inhibit
circuit 5 X1 for a short to ground, an open/high resistance, or a
short to voltage. |
| ⇒ |
If the circuit tests normal, replace the K71
Transmission Control Module. |
| 3. |
Verify the DTC does not reset.
If the DTC resets, replace the K9 Body Control Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
