Code
P1362
ACURA
P — Powertrain
TDC1 Sensor No Signal
AI status
Completed
Completed
100%
Causes
- Failed TDC (Top Dead Center) sensor (open, shorted or internally failed)
- Loose, corroded or disconnected sensor connector
- Damaged wiring harness (open/short to power, ground, or signal)
- Missing/damaged reluctor/tone wheel or timing wheel tooth
- Incorrect sensor air gap or misalignment
- Low battery/poor ground or supply voltage to sensor circuit
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Engine may crank but not start or intermittent starting
- Rough idle, misfire or stalling
- Loss of ignition timing control, poor drivability and reduced power
- Multiple related cam/crank position codes may be present
What to check
- Read freeze frame and live data with a scan tool; note RPM and related cam/crank PIDs
- Scan for additional DTCs (cam/crank reference codes) before repairs
- Visually inspect sensor, connector, and wiring for damage, corrosion, or disconnection
- Verify battery voltage and clean/verify engine ground straps
- Backprobe sensor connector to check for reference power (if Hall-type), ground, and signal
- Measure sensor resistance (if specified) and check continuity to PCM
Signal parameters
- Hall-effect (most common): 5V reference supply, signal switches between ~0V and ~5V as teeth pass — square wave pulses timed to TDC events
- VR (variable-reluctance) type: AC sine/alternating voltage whose amplitude and frequency increase with rpm; no DC reference; typically 0.1–8 VRMS depending on rpm
- Signal must be present during cranking and reliably repeat once per engine revolution for TDC1 position
- Typical checks: presence of reference voltage and ground on Hall sensors; measurable AC on VR sensors while cranking
Diagnostic algorithm
- Verify the customer complaint and note when the MIL is set. Retrieve freeze-frame data and related codes.
- Perform a visual inspection of the TDC sensor, connector, and wiring for obvious damage, oil contamination, or corrosion.
- Check battery voltage and clean battery/engine ground connections. Low voltage can cause loss of sensor signal.
- Identify whether the vehicle uses a Hall or VR type TDC sensor. Consult service manual for pinout and expected values.
- With key on engine off, backprobe connector to verify reference voltage (Hall type typically ~5V) and ground presence.
- Crank engine while measuring signal with a multimeter or, preferably, an oscilloscope. Look for a clean switching waveform (Hall) or AC waveform (VR).
- If no signal, measure continuity and resistance of wiring between sensor connector and PCM; check for shorts to power or ground.
- Inspect the reluctor/tone wheel or cam/crank gear for missing/damaged teeth or timing belt/chain jump that would prevent pulses.
- If wiring and reluctor are good but no signal, replace the TDC sensor and retest. Clear codes and road test.
- If new sensor still no signal, consider PCM input fault. Confirm with bench test or dealer-level diagnostics before replacing PCM.
Likely causes
- Connector disengaged or corroded at the TDC sensor
- Broken or worn sensor (Hall or VR type)
- Wiring chafed/shorted between sensor and PCM
- Reluctor/tone wheel damaged or timing belt/chain jumped
- Weak battery or poor ground affecting sensor reference
Fault status
Status
TDC1 Sensor No Signal — PCM reports no input from Top Dead Center sensor for cylinder 1.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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