LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2008 >> XL7 Base, AWD >> Repair and Diagnosis >> Electrical >> Horns >> Instrumentation/Driver Info./Horn >> Diagnostic Information and Procedures >> DTC P0520 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

NOTE: Do not turn the key to the crank position or engage the starter at any time during diagnosis.
  1. Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) switch.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify the scan tool Engine Oil Pressure Switch parameter is OK.
    • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.
  4. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
    • If not the specified value, test the signal circuit for an open/high resistance. If circuit test normal, replace the ECM.
  5. If all circuits test normal, test or replace the engine oil pressure switch.
scientia non olet · About LEMON Manuals