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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures >> Diagnostic Information And Procedures >> DTC B0560: Engine RPM Input Circuit Signal Invalid >> Circuit/System Testing

Circuit/System Testing

NOTE:

Diagnose any Engine Control Module DTCs before performing this diagnostic.

  1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
  2. Engine running at 600 RPM,
  3. Test for 575-800 Hz AC between the signal circuit terminal 23 and ground.
    • If not between 575-800 Hz AC 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF.
    4. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    5. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • Go to next step: If between 575-800 Hz AC 
  4. Test or replace the A11 Radio.
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