Diagnostic Routine C
Diagnostic Routine C
Diagnostic Overview
P0715, P0717, P0718
Refer to Wiring Diagram Set 30 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
The TSS (Turbine Shaft Speed) sensor is a Hall-effect sensor that sends a signal to the TCM (Transmission Control Module) indicating transmission turbine shaft (input) speed. The TSS (Turbine Shaft Speed) sensor provides converter turbine speed information for TCC (Torque Converter Clutch) strategy.
When TSS (Turbine Shaft Speed) or the TSS (Turbine Shaft Speed) circuits are faulted, the following symptoms may be present:
- Harsh engagements (due to maximum line pressure).
- Poor launch performance (due to 5th drive away).
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Inspect for damaged wiring harness(es)
- Inspect for loose or damaged connectors
- Inspect for a damaged TSS (Turbine Shaft Speed) sensor
Pinpoint Test
NOTE: If the scan tool is unable to communicate with the TCM (Transmission Control Module), REFER to Diagnostic Routine AB: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool Diagnostic Routine AB.
1. INSPECT FOR CORROSION OR TERMINAL DAMAGE
1. Disconnect the 6F35 Transmission C1520B.
2. Disconnect the TCM (Transmission Control Module).
3. Use a mirror to inspect both ends of the connectors for damage or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
Are both connectors free of any damage, corrosion, pushed-out terminals, loose wires, or missing or damaged seals?
2. VERIFY THE TSS (Turbine Shaft Speed) SENSOR CONCERN
1. Connect the 6F35 Transmission C1520B.
2. Connect the TCM (Transmission Control Module).
3. Ignition ON.
4. Using a scan tool, view TCM (Transmission Control Module) PIDs (Parameter Identifications).
5. With the aid of an assistant, monitor the TSS_SRC PID (Parameter Identification) while test driving the vehicle.
Is the TSS (Turbine Shaft Speed) sensor signal present and consistent?
3. CHECK THE TSS (Turbine Shaft Speed) SENSOR CIRCUITS FOR AN OPEN
1. Ignition OFF.
2. Disconnect the 6F35 Transmission C1520B.
3. Disconnect the TCM (Transmission Control Module).
4. Measure:
Are the resistances less than 5 ohms?
4. CHECK THE TSS (Turbine Shaft Speed) SENSOR CIRCUITS FOR A SHORT TO GROUND
1. Disconnect the 6F35 Transmission C1520A.
2. Measure:
Are the resistances greater than 10,000 ohms?
5. CHECK THE TSS (Turbine Shaft Speed) SENSOR CIRCUITS FOR A SHORT TO POWER
1. Ignition ON.
2. Measure:
Is any voltage present?
6. CHECK FOR TSS (Turbine Shaft Speed) SENSOR VOLTAGE SUPPLY AND GROUND
1. Ignition OFF.
2. Connect the TCM (Transmission Control Module).
3. Ignition ON.
4. Measure:
Is the voltage greater than 10 volts?
7. CHECK THE TCM (Transmission Control Module) FOR CORRECT OPERATION
1. Ignition OFF.
2. Disconnect the TCM (Transmission Control Module).
3. Prior to reconnecting any previously disconnected connector:
- inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
- inspect wire harness for any damaged, pinched, cut or pierced wires.
4. Connect the 6F35 Transmission C1520A.
5. Connect the 6F35 Transmission C1520B.
6. Connect the TCM (Transmission Control Module).
7. Ignition ON.
8. Using a scan tool, perform TCM (Transmission Control Module) self-test to retrieve DTCs (Diagnostic Trouble Codes).
Is the concern still present?
