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Home›Repair guides›Generac›Check Flywheel Sensor (MPU1)

Generac G9.0L G26 — Check Flywheel Sensor (MPU1)

Testing & diagnosis

For the Generac G9.0L G26, from the Generac service manual.

Applies to: Generac 130 kW PME, Generac 150 kW PME, Generac 9.0L Gaseous Engine (G26) engine

Procedure

  1. Disconnect flywheel sensor (MPU1) from the engine harness.
  2. Set DMM to measure resistance between Wire 79 Pin 3 and Wire 79A Pin 2.
  3. Set DMM to measure AC voltage.
  4. Connect breakout harness (P/N 0G41800SRV) in-line with engine control harness.
  5. Set AUTO-OFF-MANUAL switch to MANUAL and measure voltage.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Flywheel sensor resistance approximately 700–1000 ohms
  • PZ2-5 to PZ2-10: approximately 12 VDC without engine running, 10 VDC with engine running
  • Alternatively 2.0 VAC and approximately 5 kHz for 9.0L engine

Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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