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DTC 523821 Oil Lamp Circuit Open
Step Action Value(s) Yes No
1
Did you perform the On-Board (OBD) System
Check?
-
Go to Step
(2)
Go to OBD
System.
Check Sec-
tion
2
Verify that the engine has oil and oil pressure
using a mechanical oil pressure gauge before
proceeding with this chart. Oil pressure must
remain above 6 psi.
Does the engine have oil pressure above 6 psi?
Go to Step
(3)
Repair faulty
Oiling System
3
Ignition ON, Engine Running DST connected
in stem Data Mode
Clear DTC 523821
Warm the engine by idling until the ECT
temperature is above 160 degrees F. and
has been running for at least one minute
Increase engine speed above 500 RPM
Does DTC 523821 reset?
Go to Step
(4)
Intermittent
problem. Go
to Intermittent
section
4
Clear DTC 523821
Key OFF
Disconnect oil pressure switch connector
C012 and isolate the connector from engine
ground.
Start and run the engine
Does DTC 523821 reset?
Go to Step
(6)
Go to Step
(5)
5
Replace oil pressure switch
Is the replacement complete?
Go to Step
(9)
-
6
Ignition OFF
Disconnect ECM harness connector ECU-C
Using a DVOM check for continuity between
the oil pressure switch connector pin and en-
gine ground
Does the DVOM show continuity?
Repair the
shorted to
ground oil
pressure cir-
cuit as
necessary.
Refer to Wir-
ing Repairs.
Go to Step
(7)
7
Inspect ECU-B connector pin C1 for damage
corrosion or contamination
Did you find a problem?
Repair the
circuit as ne-
cessary.
Refer to Wir-
ing Repairs in
Engine Elec-
trical.
Go to Step
(8)
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