P1330

Code

DAEWOO P — Powertrain

SPARK TIMING ADJUST SIGNAL

Brand: DAEWOO

Type: P — Powertrain

Views: UK: 2 EN: 0 RU: 4

AI status

Completed

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Page language: EN

Causes

Faulty camshaft or crankshaft position sensor (or related timing reference sensor)
Damaged wiring harness or poor connector connection to sensor or ECM
Intermittent or low battery/charging system voltage affecting sensor/ECM
Failed ignition control module / ECU internal fault
Incorrect engine mechanical timing (timing belt/chain jumped)
Corroded or poor ground at ECM or sensor

Symptoms

Check Engine Light (MIL) on
Hard starting or no-start
Rough idle or intermittent misfires
Reduced engine power or hesitation under load
Poor fuel economy
Intermittent operation that may clear temporarily

What to check

Read and record freeze frame and all stored/related DTCs
Visual inspection of sensor connectors and wiring for damage, corrosion or pin push-out
Verify battery voltage and engine grounds while cranking and running
Backprobe sensor connector and check for reference power, ground and signal with multimeter/oscilloscope
Check waveforms on a scope for expected pulse pattern during cranking and at idle
Inspect mechanical timing (timing belt/chain alignment, cams/crank timing marks)

Signal parameters

Signal type: pulsed/square wave from Hall-effect or variable reluctance sensor (or digital timing output)
Voltage: Hall sensors typically 0–5 V logic; some systems use 0–12 V; variable reluctance sensors output AC voltage proportional to speed
Frequency: signal frequency varies with engine RPM; pulses should be present during cranking and increase with RPM
Expected behavior: consistent, evenly spaced pulses when engine is running; a missing, intermittent or distorted pulse stream triggers the code

Diagnostic algorithm

Retrieve and record all trouble codes and freeze-frame data. Note whether code is historic or current.
Visually inspect relevant sensors, harnesses and connectors for damage, corrosion, or pin issues. Repair any obvious faults.
Check battery and charging system; ensure stable supply voltage and good engine/ECM grounds.
Backprobe the sensor connector: verify sensor reference power (if used), ground, and that a signal is present while cranking and running with a DVM or oscilloscope.
Use an oscilloscope to confirm proper waveform shape, amplitude and timing consistency. Compare to known-good pattern or service manual specs.
If signal missing or abnormal, test or replace the sensor. If sensor good, inspect wiring continuity between sensor and ECM and repair any opens/shorts.
If wiring and sensor are good, check for ECM input faults: inspect ECM connector pins, grounds, and perform wiggle tests for intermittent faults.
Verify mechanical timing (cam/crank alignment). Repair timing belt/chain issues before replacing sensors or ECM.
If diagnosis points to ECM failure, confirm with manufacturer procedures before replacement; perform reprogram/learn procedures if required after part replacement.
Clear codes and perform test drive to confirm repair; monitor live data for stability of the timing adjust signal.

Likely causes

Open/short in sensor signal or power/ground circuit
Cam/crank position sensor failure
ECM input circuit fault or internal timing circuit failure
Connector corrosion or loose pin at sensor/ECM

Fault status

⚠️ Status

Stored when the ECM detects an absent, inconsistent or out-of-spec spark timing adjust signal input used for ignition timing control. May be intermittent or persistent depending on the underlying fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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P1330 — SPARK TIMING ADJUST SIGNAL