DTC P0973 or P0974
Diagnostic Instructions
DTC Descriptors
| DTC P0973: Shift Solenoid Valve 1 Control
Circuit Low Voltage |
| DTC P0974: Shift Solenoid Valve 1 Control
Circuit High Voltage |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Shift Solenoid Control
|
P0973
|
P0974
|
P0974
|
-
|
|
| |
Typical Scan Tool Data
Shift Solenoid Valve 1
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Operating Conditions: Engine running,
normal operating temperature
Parameter Normal Range: On/Off
|
Shift Solenoid Control
|
Off
|
Off
|
Off
|
|
| |
Circuit/System Description
Shift Solenoid Valve 1 is installed on the middle valve body.
The solenoid turn ON and OFF in response to signals output from the
TCM. According to the ON or OFF status of Shift Solenoid Valve 1 or
Shift Solenoid Valve 2, the 1st gear engine brake operates or the
gear shifts into change. As a fail-safe function, if any shift
solenoid abnormality occurs, the transmission control module (TCM)
will disable the current to the solenoids.
Conditions for Running the DTC
P0973
| • |
The ignition voltage is
10.2-15.5 V. |
| • |
The engine speed is greater
than 400 RPM for 2 s. |
| • |
The transmission is not in
emergency mode. |
| • |
10 ms after solenoid output
changed. |
P0974
| • |
The ignition voltage is
10.2-15.5 V. |
| • |
The engine speed is greater
than 400 RPM for 2 s. |
| • |
The transmission is not in
emergency mode. |
| • |
10 ms after solenoid output
changed. |
Conditions for Setting the DTC
P0973
The TCM detects an ON signal (12 V) of the Shift Solenoid Valve 1
circuit when the Shift Solenoid Valve 1 is commanded OFF (0 V) for
100 ms continuously after 5 times.
P0974
The TCM detects an OFF signal (0 V) of the Shift Solenoid Valve 1
circuit when the Shift Solenoid Valve 1 is commanded ON (12 V) for
100 ms continuously after 5 times.
Action Taken When the DTC Sets
| • |
DTCs P0973 and P0974 are Type
A DTCs. |
| • |
The TCM freezes transmission
adaptive functions. |
| • |
The TCM turns OFF all
solenoids. |
| • |
The TCM allows the vehicle to
operate only in the second gear "R" range after a stop.
|
Conditions for Clearing the DTC
| • |
DTCs P0973 and P0974 are Type
A DTCs. |
| • |
The TCM detects an ON signal
(12 V) of the Shift Solenoid Valve 1 circuit when the Shift
Solenoid Valve 1 is commanded ON (12 V) for 1 s
continuously. |
| • |
The TCM detects an OFF signal
(0 V) of the Shift Solenoid Valve 1 circuit when the Shift Solenoid
Valve 1 is commanded OFF (0 V) for 1 s continuously. |
Diagnostic Aids
When attempting to set solenoid electrical DTCs, ensure the
control solenoid valve assembly is warmed up and the transmission
is operated long enough to ensure a 3°C (5°F) increase in
temperature. This will place the TCM in the optimal conditions to
test solenoid electrical DTCs.
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. |
Ensure the transmission fluid
temperature is between 50-80°C (122-176°F). |
| 2. |
Operate the vehicle in 2nd
gear long enough to ensure at least a 3°C (5°F) rise in oil
temperature. |
| 3. |
Place the gear selector in
Reverse for 5 s and then idle vehicle for 5 s. |
| 4. |
Observe the scan tool data
Shift Solenoid Valve 1 parameter. The parameter should display
ON. |
Circuit/System Testing
Static Test
| 1. |
Ignition OFF, remove the K71
Transmission Control Module. |
| 2. |
Test for 11-15 Ω between
the Shift Solenoid Control circuit terminal 5 X2 and ground.
|
| ⇒ |
If not within the specified range, test the wiring
harness for internal short, or interruption. If the circuit test
normal, replace the Q32A Shift Solenoid Valve 1. |
| 3. |
Test for infinite resistance
between each terminal and the Shift Solenoid Control circuit
terminal 5 X2. |
| ⇒ |
If less than the specified range, replace the
wiring harness. |
| 4. |
If all circuits test normal,
test or replace the Q32A Shift Solenoid Valve 1. Verify the DTC
does not reset. |
| ⇒ |
If the DTC resets, replace the K71 Transmission
Control Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
