P0322 high Severity

P0322: Ignition/Distributor Engine Speed Input Circuit No Signal

May cause engine cranking without start, stalling, misfires, loss of power and potential no‑start situations

Overview

P0322 no RPM signal from crankshaft/camshaft/engine speed input circuit; investigate sensor circuits and wiring

Common Symptoms

  • Check Engine Light illuminated
  • Engine cranks but refuses to start
  • Engine stalls or runs rough
  • Loss of power or acceleration
  • Increased fuel consumption or misfires

Most Common Causes

Faulty crankshaft position sensor high

CKP sensor failure often results in no RPM signal to ECM

Damaged/worn or corroded wiring and connectors in speed sensor circuit high

Open circuit or poor connection can interrupt signal

Faulty camshaft position sensor or distributor pickup (if equipped) medium

CMP or distributor may provide engine speed input on some vehicles

PCM/ECU internal fault or calibration issue low

Rare but possible if sensor and wiring test OK

Diagnostic Steps

  1. Verify P0322 with OBD‑II scanner and view live data for RPM signal during cranking
    Expected: No RPM signal or zero engine speed indication
    Interpretation: Confirms missing engine speed input
  2. Visually inspect crankshaft/camshaft sensor wiring and connectors for damage or corrosion
    Expected: No broken wires, corrosion or loose terminals
    Interpretation: If found, repair harness or connections
  3. Test sensor power, ground and output with multimeter/oscilloscope while cranking
    Expected: Appropriate reference voltage and expected signal waveform
    Interpretation: No signal indicates faulty sensor or circuit issue
  4. If sensor tests fail, replace crankshaft or camshaft position sensor
    Expected: Engine speed signal returns and code clears
    Interpretation: Confirms sensor as cause
  5. If all above pass and no signal, test PCM input pin and consider ECU diagnosis
    Expected: Signal at PCM pin should match sensor output
    Interpretation: Mismatch indicates possible PCM fault

Repair Solutions

Replace crankshaft position sensor medium
Estimated Cost: $150 - $400

Typical repair when sensor output is absent

Repair or replace damaged wiring/connectors in sensor circuit medium
Estimated Cost: $50 - $300

Costs vary with extent of wiring harness repair

Replace camshaft position sensor or distributor pickup medium
Estimated Cost: $100 - $350

If CMP or distributor provides speed input

Test and repair or replace PCM/ECU hard
Estimated Cost: $500 - $1500

Rare; consider only after ruling out sensors and wiring

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Replacing crankshaft position sensor without checking wiring or camshaft position sensor
  • Assuming low battery voltage is cause without verifying sensor circuit integrity

Frequently Asked Questions

What does a P0322 diagnostic trouble code signify?

When your OBD-II scanner reads P0322, it means: Ignition/Distributor Engine Speed Input Circuit No Signal. This code is related to the vehicle's Ignition.

Can P0322 cause engine damage?

This is a high priority issue. May cause engine cranking without start, stalling, misfires, loss of power and potential no‑start situations

Symptoms associated with DTC P0322

Common symptoms include: Check Engine Light illuminated, Engine cranks but refuses to start, Engine stalls or runs rough. You might also notice the Check Engine Light is on.

What causes the P0322 code?

It can be caused by several factors, most notably: Faulty crankshaft position sensor, Damaged/worn or corroded wiring and connectors in speed sensor circuit, Faulty camshaft position sensor or distributor pickup (if equipped).

What is the price difference for fixing P0322?

It depends on what needs to be fixed. Repair or replace damaged wiring/connectors in sensor circuit repairs are cheaper (~$300), while Test and repair or replace PCM/ECU repairs are on the higher end (~$1500).

Is the P0322 code specific to Toyota?

This is a universal code. You might see P0322 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

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