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 Valve 1 Control
|
P0973
|
P0974
|
P0974
|
--
|
Typical Scan Tool Data
Shift Solenoid Valve 1 Control
Circuit High Voltage Test Status
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
|
Operating Conditions: Engine running,
normal operating temperature
Parameter Normal Range: OK
|
|
Shift Solenoid Valve 1 Control
|
--
|
--
|
Fault or Malfunction
|
Shift Solenoid Valve 1 Control
Circuit Open Test Status
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
|
Operating Conditions: Engine running,
normal operating temperature
Parameter Normal Range: OK
|
|
Shift Solenoid Valve 1 Control
|
-
|
Fault or Malfunction
|
-
|
Shift Solenoid Valve 1 Control
Circuit Low Voltage Test Status
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
|
Operating Conditions: Engine running,
normal operating temperature
Parameter Normal Range: OK
|
|
Shift Solenoid Valve 1 Control
|
Fault or Malfunction
|
--
|
--
|
Circuit/System Description
The shift solenoid (SS) valve 1 is part of the control
solenoid valve assembly which has no serviceable components.
SS valve 1 is a normally closed (NC) ON/OFF solenoid
and is controlled by the transmission control module (TCM)
through a low side driver. When the SS valve 1 is
energised (ON), SS 1 fluid pressure is directed to the clutch
select valve. Power to the SS 1 is supplied by the TCM through
a high side driver (HSD). The HSD protects the circuit and
components from excessive current flow. If excessive current flow
is detected, the HSD will turn OFF. When the fault is corrected the
HSD will reset.
Conditions for Running the DTC
P0973 or P0974
| • |
The engine speed is 400 RPM or greater for
5 seconds. |
| • |
The ignition voltage is 9.0 volts or
greater. |
Conditions for Setting the DTC
P0973
The control solenoid valve assembly detects an internal low
voltage electrical malfunction of the SS Valve 1 control
circuit for 2 seconds.
P0974
The control solenoid valve assembly detects an internal high
voltage electrical malfunction of the SS Valve 1 control
circuit for 2 seconds.
Action Taken When the DTC Sets
P0973
| • |
DTC P0973 is a Type A DTC. |
| • |
The TCM freezes transmission adaptive
functions. |
| • |
The TCM commands maximum line pressure. |
| • |
The TCM limits the transmission to 2nd gear and
reverse. |
| • |
The TCM inhibits the Tap Up/Tap Down
function. |
| • |
The TCM inhibits manual shifting of forward
gears. |
P0974
| • |
DTC P0974 is a Type B DTC. |
| • |
The TCM inhibits 1st gear. |
Conditions for Clearing the DIC/DTC
| • |
DTC P0973 is a Type A DTC. |
| • |
DTC P0974 is a Type B DTC. |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-48616-10 Adapter Harness
For equivalent regional tools, refer to
Special Tools .
Circuit/System Verification
- Operate the vehicle in 2nd gear long enough to ensure
at least a 3°C (5°F) rise in TCM temperature.
- Place the gear selector in Reverse for 5 seconds
and then idle vehicle for 5 seconds. Verify with a scan tool,
the following test status parameters displays OK.
| • |
Shift Solenoid Valve 1 Control Circuit Open
Test Status |
| • |
Shift Solenoid Valve 1 Control Circuit High
Voltage Test Status |
| • |
Shift Solenoid Valve 1 Control Circuit Low
Voltage Test Status |
- After performing the above steps, verify that the DTC
does not reset by operating the vehicle within the Conditions for
Running the DTC. You may also operate the vehicle within the
conditions you observe from the Freeze Frame/Failure Records data.
If the vehicle passes the Circuit/System Verification procedure,
then STOP. Do not perform the Circuit/System Testing or Component
Testing as this may result in an unnecessary part replacement.
Refer to
Testing for Intermittent Conditions and Poor Connections .
Circuit/System Testing
Note: You must perform the
Circuit/System Verification first.
- Ignition OFF, remove the Q8 control solenoid valve
assembly. Refer to
Control Solenoid Valve and Transmission Control Module Assembly
Replacement .
- Perform the
Control Solenoid Valve and Transmission Control Module Assembly
Inspection .
- Place the Q8 control solenoid valve assembly on a
clean work surface near the transmission assembly.
- Connect DT-48616-10 harness between the
vehicle wire harness X1 14-way transmission electrical
connector, and the Q8 control solenoid valve assembly.
- Ignition ON, verify with a scan tool the following
test status parameters display, OK.
| • |
Shift Solenoid Valve 1 Control Circuit Open
Test Status |
| • |
Shift Solenoid Valve 1 Control Circuit High
Voltage Test Status |
| • |
Shift Solenoid Valve 1 Control Circuit Low
Voltage Test Status |
| ⇒ |
If any test status parameter displays Fault or
Malfunction, replace the Q8 control solenoid valve assembly. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
