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TM 9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E . F L A S H C O D E : 36
J1587 CODE:
P100 4 - OIL PRESSURE CIRCUIT FAILED LOW (LOW VOLTAGE)
STEP/SEQUENCE
36-4
Check for +5 Volts
Turn ignition off.
Remove jumper wire.
Turn ignition on.
Read voltage on OPS
connector, socket C (red lead) to
socket A (black lead).
36-5
Check for Signal Open
Turn ignition off.
Disconnect the engine harness
connector at the ECM.
Install a jumper wire between
sockets A and B of the OPS
connector.
Read resistance between sockets
P2 and Y2 on the engine harness
connectors.
36-6
Check for Short
Remove jumper wire.
Disconnect the engine harness
connector at the ECM.
Read resistance between sockets
A and B on the OPS
connector.
Also read resistance between
socket B and a good ground.
36-7
Check ECM Connectors
Check terminals at the engine
harness connector (both the ECM
and harness side) for damage;
bent, corroded and unseated pins
or sockets. Especially W1, P2,
and Y2 terminals and pins at ECM
RESULT
WHAT TO DO NEXT
Between 4 to
6 volts.
Less than
4 volts.
Go to 36-5.
Go to 36-6.
Greater than
6 volts.
Go to 36-10.
Go to 36-11.
Signal line (ckt #530) is open.
Repair open. Then go to 36-30.
Less than or
equal to 10,000 ohms.
Signal line (ckt #530) is shorted
to the return line (ckt #452) or
battery ground. Repair short.
Then go to 36-30.
Greater than
10,000 ohms or open.
on both readings.
Go to 36-12.
Terminals and
Replace ECM (para 7-29.1).
connectors are okay.
Then go to 36-30.
Problem found.
Repair terminals/connectors
(para 7-77). Then go to 36-30.
H-185
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