SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 52 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 4.2L)DIAGNOSTIC TESTSDTC P0326: KNOCK SENSOR MODULE CIRCUITDESCRIPTION
2004 Oldsmobile Bravada RWD

DTC P0326: Knock Sensor Module Circuit: Description

2004 Oldsmobile Bravada RWDSECTION Description
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The knock sensor (KS) produces an AC voltage at all engine speeds and loads. The Powertrain Control Module (PCM) then adjusts the spark timing based on the amplitude and frequency of the KS signal. The PCM uses the KS signal to calculate the average voltage. Then the PCM assigns a voltage value. The PCM checks the knock sensor and related wiring by comparing the actual knock signal to the assigned voltage range. A normal KS signal should stay outside the assigned voltage range. This Diagnostic Trouble Code (DTC) will set if the PCM malfunctions in a manner that will not allow proper diagnosis of the KS system. The KS system uses 2 knock sensors. Both sensors are connected directly to the PCM using the following circuits:

  • The KS 1 signal circuit.
  • The KS 1 low reference circuit.
  • The KS 2 signal circuit.
  • The KS 2 low reference circuit.
KS 1 is at the front of the engine, or nearest the accessory belt. KS 2 is at the rear of the engine, or nearest the driveplate. Both sensors are on the intake side of the block.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.