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P0976

DTC P0973, P0974, P0976, P0977, P0979, P0980, P0982, P0983, P0985, or P0986

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure.
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

DTC Descriptors
DTC P0973 Shift Solenoid (SS) 1 Control Circuit Low Voltage
DTC P0974 Shift Solenoid (SS) 1 Control Circuit High Voltage
DTC P0976 Shift Solenoid (SS) 2 Control Circuit Low Voltage
DTC P0977 Shift Solenoid (SS) 2 Control Circuit High Voltage
DTC P0979 Shift Solenoid (SS) 3 Control Circuit Low Voltage
DTC P0980 Shift Solenoid (SS) 3 Control Circuit High Voltage
DTC P0982 Shift Solenoid (SS) 4 Control Circuit Low Voltage
DTC P0983 Shift Solenoid (SS) 4 Control Circuit High Voltage
DTC P0985 Shift Solenoid (SS) 5 Control Circuit Low Voltage
DTC P0986 Shift Solenoid (SS) 5 Control Circuit High Voltage

Diagnostic Fault Information





Circuit/System Description
The five shift solenoids (SS) are installed directly in the transmission valve body (V/B). The vehicle gear range is determined by various combinations of the shift solenoid states. Each shift solenoid is controlled (driven) by the TCM.

Conditions for Running the DTC
^ The engine is running.
^ The transmission is not in Emergency Mode.

Conditions for Setting the DTC
The TCM detects that the shift solenoid actual state doesn't match the commanded state for 0.5 second.

Action Taken When the DTC Sets

P0973, P0976, P0977, P0982, and P0983
^ Type A DTC
^ The transmission will operate in 5th gear in D or M range, 2nd gear in L range.

P0974, P0985, and P0986
^ Type A DTC
^ The transmission will operate in 5th gear in D or M range, 2nd gear in L range.
^ The engine torque is limited to 185 Nm

P0979
^ Type A DTC
^ The transmission will operate in 5th gear in D or M range, 4th gear in L range.

P0980
^ Type A DTC
^ The transmission will operate in 3rd gear in D or M range.

Conditions for Clearing the DTC
DTC P0973, P0974, P0976, P0977, P0979, P0980, P0982, P0983, P0985, and P0986 are Type A DTCs.

Reference Information
Schematic Reference
[Automatic Transmission Controls Schematics]
Connector End View Reference
[Component Connector End Views]
Electrical Information Reference
^ [Circuit Testing]
^ [Connector Repairs]
^ [Testing for Intermittent Conditions and Poor Connections]
^ [Wiring Repairs]
DTC Type Reference
^ [Diagnostic Trouble Code (DTC) Type Definitions]
^ [Diagnostic Trouble Code (DTC) List/Type]
Scan Tool Reference
[Control Module References] for scan tool information Programming and Relearning

Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool.
2. Record Freeze Frame and Failure Records.
3. Clear DTCs.
4. Operate the vehicle under the conditions observed in the Failure Records.
5. Observe the DTC information with the scan tool. Verify that the DTC does not set.

Circuit/System Testing
1. Ignition OFF, disconnect the 22-way automatic transmission (AT) wiring harness connector (C2) at the TCM.
2. Test for 11-24 ohms between the shift solenoid control circuit terminal (harness side) and ground.
> If not within the specified range
^ Remove the appropriate solenoid and test for 11-24 ohms.
> If not within the specified range, replace the valve body assembly.
^ Replace the AT wiring harness.
3. At the TCM, connect a test lamp between the shift solenoid high control circuit and the ground.
4. Command the shift solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
> If the test lamp does not follow the commanded states, replace the TCM.

Component Testing
Test the shift solenoid, at 20°. for 11-16 ohms between the control circuit terminal and its case ground.
> If not within the specified range, replace the solenoid.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure.

DTC P1719

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure.
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

DTC Descriptor
DTC P1719 Torque Delivered Signal - Unusual Shifting

Circuit/System Description
The transmission control module (TCM) calculates last shift status based on data from the input and output speed sensors. The TCM measures the amount of time required to complete each shift.

Conditions for Running the DTC
^ No Throttle Position (TP) Sensor DTC P0120
^ No Transmission Range (TR) Switch DTCs P0706, P0707, or P0708
^ No Transmission Fluid Temperature (TFT) Sensor DTCs P0711, P0712, or P0713
^ No Speed Sensor DTCs P0717, P0722, P0727
^ No Pressure Control (PC) Solenoid DTCs P0962, P0963, P0966, P0967, P0970, or P0971
^ No Shift Solenoid (SS) Control Circuit DTCs P0973, P0974, P0976, P0977, P0979, P0980, P0982, P0983, P0985, or P0986
^ No Transmission Torque Delivered Circuit DTC P2637
^ No Communications DTCs U0100 or U2104
^ Transmission fluid temperature (TFT) is greater than 60°.
^ Engine speed is greater than 400 RPM.
^ Shift range equals D, M, or L.
^ Ignition voltage is greater than 10.5 volts.

Conditions for Setting the DTC
The TCM commands a gear shift, and one of the following occurs 5 times:
^ Tie-up
^ Engine flare
^ Long shift time
^ Rapid shifting

Action Taken When the DTC Sets
^ DTC P1719 is a Type A DTC.
^ The transmission will operate in 5th gear in D or M range, 2nd in L range.
^ Limit engine torque to 150 Nm

Conditions for Clearing the DTC
DTC P1719 is a Type A DTC.

Diagnostic Aids
Improper transmission fluid level may cause DTC P0742 to set.
Overloading the vehicle, exceeding the trailer towing limit, or towing in D (drive) may set DTC P1719.

Reference Information
Schematic Reference
[Automatic Transmission Controls Schematics]
Connector End View Reference
[Component Connector End Views]
Electrical Information Reference
^ [Circuit Testing]
^ [Connector Repairs]
^ [Testing for Intermittent Conditions and Poor Connections]
^ [Wiring Repairs]
DTC Type Reference
^ [Diagnostic Trouble Code
(DTC) Type Definitions]
^ [Diagnostic Trouble Code (DTC) List/Type]
Scan Tool Reference
[Control Module References] for scan tool information Programming and Relearning

Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool.
2. Record Freeze Frame and Failure Records.
3. Clear DTCs.
4. Operate the vehicle under the conditions observed in the Failure Records.
5. Observe the DTC information with the scan tool. Verify that the DTC does not set.

Circuit/System Testing
1. Perform a line pressure test.
2. Remove the Control valve body cover.
3. Inspect the inside of the control valve body cover for excessive sediment. There should not be excessive sediment.
> If excessive sediment is found inspect and replace as necessary the:
^ Forward Clutch
^ Direct Clutch
^ 4-5 Clutch
^ Second Coast Clutch
^ 1-2, Reverse Clutch
^ Low and Reverse Clutch
^ 3rd Gear Band
^ Second Clutch
^ Second Clutch Sprag
^ Low Clutch Sprag
> If all conditions test normal, test or replace the transmission.
4. Inspect the control valve body assembly for the following conditions. The conditions should not be found.
^ Stuck 3-4, 4-5 Shift Solenoid Valve Assembly
^ Stuck Reverse Shift Solenoid
^ Stuck Shift PC Solenoid
^ Stuck TCC Lock Up PC Solenoid
^ Stuck Shift Pressure Control Valve
^ Stuck Shift Pressure Relay Valve
^ Stuck Second Clutch Control Valve
^ Stuck 1-2, Reverse Clutch Control Valve
Refer to [Control Valve Body Replacement].
> If all circuits and components test normal, replace the transmission.
5. Verify that the control valve body has been serviced within the past 3 months. If the control valve body has not been serviced, test or replace the control valve body assembly.
6. If all circuits and components test normal, replace the transmission.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure.
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