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P1713 Technical Manual: Turbine Shaft Speed Sensor Intermittent Error – Complete Diagnostic Guide
Introduction to P1713 Diagnostic Trouble Code
The P1713 diagnostic trouble code (DTC) is a manufacturer-specific OBD-II code that indicates an intermittent electrical fault in the Turbine Shaft Speed (TSS) sensor circuit. This sensor is critical for modern automatic transmission operation, providing real-time data about transmission input shaft rotational speed to the Transmission Control Module (TCM) or Powertrain Control Module (PCM).
Technical Definition
P1713: Turbine Shaft Speed Sensor Circuit Intermittent. This code is set when the TCM/PCM detects erratic, irregular, or intermittent signal patterns from the TSS sensor that deviate from expected parameters over multiple drive cycles, but do not constitute a complete circuit failure.
The TSS sensor operates as a magnetic reluctance sensor, generating an alternating current (AC) voltage signal proportional to the rotational speed of the transmission’s input shaft. This data is used for:
- Shift Timing Calculation: Determining optimal shift points based on torque converter slip
- Torque Converter Clutch (TCC) Control: Regulating lock-up clutch engagement and slippage
- Transmission Adaptive Learning: Adjusting shift pressure and timing based on wear
- Fail-Safe Management: Initiating limp mode when implausible signals are detected
Technical Specifications & Voltage Parameters
Standard TSS Sensor Electrical Specifications
| Parameter | Normal Range | Critical Threshold | Test Conditions |
|---|---|---|---|
| Coil Resistance | 195-245 Ω (typical) | <190 Ω or >250 Ω | Sensor disconnected, 20°C ambient |
| AC Voltage Output | 0.5-3.5 V AC | <0.3 V AC or >4.0 V AC | 1500 RPM, neutral gear |
| Frequency Range | 50-2500 Hz | Outside operational range | Varies with vehicle speed |
| Air Gap Specification | 0.5-1.5 mm | >2.0 mm | Sensor to tone wheel clearance |
| Signal Amplitude | ≥0.5 V peak-to-peak | <0.3 V peak-to-peak | Minimum acceptable signal strength |
⚠️ Critical Warning
Manufacturer specifications vary significantly. Always consult factory service information for your specific vehicle. The above values are industry averages and may not apply to your particular make/model.
Signal Pattern Analysis
A healthy TSS sensor produces a consistent sinusoidal AC waveform. Intermittent P1713 codes typically exhibit one of these abnormal patterns:
- Signal Dropout: Complete loss of signal for 50-200ms intervals
- Amplitude Fluctuation: Variable signal strength without RPM change
- Frequency Jitter: Irregular waveform timing inconsistent with shaft speed
- Noise Injection: Electrical interference superimposed on clean signal
Complete Diagnostic Procedure
Pre-Diagnostic Requirements
- Digital Multimeter (DMM) with Min/Max recording capability
- Oscilloscope (optional but recommended for intermittent faults)
- Factory service manual or equivalent wiring diagrams
- Scan tool with bidirectional controls and live data streaming
- Vehicle on lift or secure jack stands for undercarriage access
Step-by-Step Diagnostic Protocol
-
Initial Code Verification & Data Collection
Using a professional scan tool, verify P1713 is stored as current or pending. Record freeze frame data including engine RPM, vehicle speed, transmission temperature, and TSS PID value at time of fault.
-
Live Data Monitoring
Monitor TSS sensor PID (Parameter ID) while driving under conditions that replicate the fault. Look for:
- TSS reading dropping to 0 RPM while driving
- Erratic TSS values not matching engine RPM
- TSS signal loss during specific maneuvers (turns, bumps, acceleration)
-
Circuit Integrity Testing
Disconnect TSS sensor connector. Measure:
- Resistance between sensor terminals (spec: 195-245Ω)
- Continuity to ground (should be infinite/open circuit)
- Insulation resistance between terminals and sensor body (>1MΩ)
-
Wiring Harness Evaluation
Perform comprehensive wiring inspection focusing on:
- Chafing points near moving components
- Connector integrity (pins, seals, locking mechanisms)
- Wire fatigue at stress relief points
- Corrosion in moisture-prone areas
-
Dynamic Signal Analysis
Using an oscilloscope or AC-coupled DMM, monitor TSS signal while:
- Engine running in park/neutral (watch for consistent waveform)
- Performing wiggle test on wiring harness
- Applying thermal stress (heat gun on sensor/wiring)
- Replicating road vibration (tap test on components)
-
Tone Wheel Inspection
For internal sensors, remove transmission pan/valve body to inspect:
- Tone wheel tooth damage or missing teeth
- Excessive debris accumulation on magnetic sensor tip
- Proper alignment and runout
- Bearing play affecting air gap
Waveform Type: Sinusoidal AC
Frequency: ~75 Hz (varies with gear ratio)
Amplitude: 1.2-2.5 V peak-to-peak
Duty Cycle: 50% symmetrical
Noise: <100mV peak random noise
Related Diagnostic Trouble Codes
P1713 rarely occurs in isolation. Understanding related codes helps identify systemic issues.
Turbine Shaft Speed Sensor “A” Circuit
Complete circuit failure or signal loss
TSS Sensor Circuit Range/Performance
Signal implausible but present
TSS Sensor Circuit No Signal
Complete open circuit or sensor failure
Output Shaft Speed Sensor Circuit
Related sensor providing conflicting data
OSS Circuit Range/Performance
Output speed sensor correlation error
Incorrect Gear Ratio
Result of faulty TSS data causing shift errors
Torque Converter Clutch Circuit
TCC control error due to bad TSS signal
TCC Pressure Control Solenoid
Related circuit often shares wiring harness
Code Combination Analysis
| Code Combination | Likely Root Cause | Diagnostic Priority |
|---|---|---|
| P1713 + P0715 | Complete wiring harness failure or sensor connector issue | High – Check main power/ground circuits |
| P1713 + P0720 | Shared reference voltage or ground circuit problem | High – Check TCM/PCM power supply |
| P1713 + P0730 | Mechanical transmission issue affecting both sensors | Medium – Check tone wheels and shafts |
| P1713 alone | Intermittent sensor fault or minor wiring issue | Low-Medium – Focus on sensor and local wiring |
Component Failure Analysis
TSS Sensor Failure Modes
| Failure Mode | Detection Method | Root Cause | Repair Action |
|---|---|---|---|
| Internal Coil Breakdown | Resistance fluctuates with temperature | Thermal cycling fatigue | Replace sensor |
| Magnet Demagnetization | Reduced signal amplitude | Excessive heat exposure | Replace sensor |
| Connector Corrosion | Intermittent signal dropout | Moisture intrusion | Clean or replace connector |
| Wire Fatigue | Signal loss during vibration | Inadequate strain relief | Repair wiring with solder/shrink |
| Tone Wheel Damage | Erratic frequency pattern | Debris impact or wear | Replace tone wheel |
Environmental Failure Contributors
- Thermal Stress: Sensor exposure to temperatures exceeding 150°C (302°F)
- Fluid Contamination: Transmission fluid with excessive metallic particles
- Vibration: Engine/transmission mounts allowing excessive movement
- Chemical Exposure: Solvents or cleaners degrading wire insulation
- Electromagnetic Interference: Proximity to high-current wiring
