PRE-RELEASE
DTC P0976 or P0977
| DTC P0976 or P0977 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0976
Shift Solenoid Valve 2 Control Circuit Low Voltage
DTC P0977
Shift Solenoid Valve 2 Control Circuit High Voltage
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Shift Solenoid (SS) 2 Control | P0976 | P0977 | P0977 | - |
| Typical Scan Tool Data |
Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
| Operating conditions: Ignition ON Parameter Normal Range: OK | |||
| Shift Solenoid 2 Control | - | - | Fault or Malfunction |
Shift Solenoid Valve 2 Control Circuit Open Test Status
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
| Operating conditions: Ignition ON Parameter Normal Range: OK | |||
| Shift Solenoid 2 Control | - | Fault or Malfunction | - |
Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
| Operating conditions: Ignition ON Parameter Normal Range: OK | |||
| Shift Solenoid 2 Control | Fault or Malfunction | - | - |
| Circuit/System Description |
The shift solenoid (SS) 2 is part of the control solenoid valve assembly, which has no serviceable components. SS 2 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 2 is energized, ON, SS 2 fluid pressure is directed to the clutch select valve 3, which allows the valve to overcome the spring pressure and move to the applied position. The current to SS 2 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 |
P0976
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The engine speed is 400 RPM or greater for 5 seconds.
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The ignition voltage is 8.6 volts or greater.
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DTC P0976 is not set.
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P0977
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The engine speed is 400 RPM or greater for 5 seconds.
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The ignition voltage is 8.6 volts or greater.
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DTC P0977 is not set.
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| Conditions for Setting the DTC |
P0976
The TCM detects a short to ground on the SS 2 control circuit for 2 seconds.P0977
The TCM detects an open or short to power on the SS 2 control circuit for 2 seconds.| Action Taken When the DTC Sets |
P0976
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DTC P0976 is a Type B DTC.
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The TCM freezes transmission adaptive functions.
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The TCM commands maximum line pressure.
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P0977
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DTC P0977 is a Type A DTC.
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The TCM limits the transmission to Reverse and 5th gear operation.
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The TCM inhibits the torque converter clutch (TCC).
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The TCM commands maximum line pressure.
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The TCM freezes transmission adaptive functions.
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The TCM turns the HSD OFF.
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The TCM inhibits Tap Up/Down function.
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The TCM inhibits manual shifting of forward gears.
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| Conditions for Clearing the DIC/DTC |
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DTC P0976 is a Type B DTC.
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DTC P0977 is a Type A DTC.
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| Reference Information |
Connector End View Reference
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Component Connector End Views
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Inline Harness Connector End Views
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Description and Operation
Transmission General Description
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-47825-20 Adapter Harness
For equivalent regional tools, refer to Special Tools .
| Circuit/System Verification |
| 1. |
Operate the vehicle in 3rd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
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Place the gear selector in Reverse for 5 seconds and then idle the vehicle in Park for 5 seconds. Verify with a scan tool the following test status parameters displays OK:
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Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
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Shift Solenoid Valve 2 Control Circuit Open Test Status
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Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
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After you complete the steps described above, check the diagnostic trouble code is not reset by driving the vehicle according to the conditions for running diagnostic trouble codes (DTC). You can also drive the vehicle according to the conditions you see in Freeze Frame/ Failure records. If the vehicle passes the circuit/system verification procedure, then stop. Do not perform the circuit/system test or component test as this may result in unnecessary part replacement. Refer to
Testing for Intermittent Conditions and Poor Connections
.
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| Circuit/System Testing |
| 1. |
Remove control solenoid valve assembly Q8 with ignition OFF. See Replacing control solenoid valve assembly and transmission control module . |
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| 2. |
Perform the
Control Solenoid Valve and Transmission Control Module Assembly Inspection
.
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Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
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Connect the
DT-47825-20
harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
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Ignition ON, verify with a scan tool the following test status parameters display OK:
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Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
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Shift Solenoid Valve 2 Control Circuit Open Test Status
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Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
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If any test status parameter displays Fault or Malfunction, replace the Q8 control solenoid valve assembly.
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| Repair Instructions |
| Note | ||
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Perform the
Resetting of the transmission's adaption
after all transmission repairs.
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Before replacing the TCM, perform the
Control Solenoid Valve and Transmission Control Module Assembly Inspection
.
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Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid valve assembly replacement, setup, and programming
