2
45
DTC P0520/P0524 ENGINE OIL PRESSURE SWITCH FAULT
Circuit Description
The normally closed contacts of the oil pressure switch
are held open by engine oil pressure when the engine is
running. If oil pressure drops below 7-10 psi, the contacts
close to complete a circuit to ground, and DTC P0524 is
set.
The ECM will also check to verify a closed circuit (switch
contacts closed) when the engine is not running. The
Service Power Supply Harness (Part No. 847252) must
be used to do this check. If an open circuit is detected,
then DTC P0520 is displayed after a delay of 30 seconds
(but the code is not stored).
Diagnostic Aids
Check for the following conditions:
1. Poor ECM connection or oil pressure switch terminal
connection.
2. Inspect wire harness connectors for backed out
terminals, improper mating, broken locks, improperly
formed or damaged terminals, and poor terminal to
wire connection.
3. Damaged wire harness and/or connectors. If harness
appears to be OK, shake or wiggle wire harness
and/or connector with DVOM attached. Radical
voltage changes can indicate the location of the fault
condition.
Always clear DTCs after performing repairs.
Not for
Reproduction
Summary of Contents for Vanguard EFI 380000
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