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TM 9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE:
34
J1587 CODE:
P102 4 - TURBO BOOST PRESSURE CIRCUIT FAILED LOW (LOW VOLTAGE)
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
34-4
Check for +5 Volts
Remove jumper wire.
Turn ignition on.
Read voltage on TBS connector,
pin C (red lead) to pin A (black
lead).
34-5
Check for Signal Open
Turn ignition off.
Disconnect the engine harness
connector at the ECM.
Install a jumper wire between
pins A and B of the TBS
connector.
Read resistance between sockets
P1 and Y2 on the engine
harness connector.
34-6
Check for Short
Remove jumper.
Read resistance between pins A
and B on the TBS connector.
Also read resistance between
socket B and a good ground.
34-7
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.
Go to 34-5.
Go to 34-8.
Go to 34-10
Less than or
equal to 5 ohms.
Go to 34-6.
Greater than
5 ohms or open.
Signal line (ckt #432) or return
line (ckt #452) is open. Repeat
check from pin A to Y2 and pin
B to P1. Repair open. Then go
to 34-30.
Less than or
equal to 10,000 ohms
on either readings.
Greater than
10,000 ohms or open
on both readings.
Signal line (ckt #432) is shorted
to the return line (ckt #452).
Repair short. Then go to 34-30.
Then go to 34-7.
Terminals and
connectors are okay.
Problem found.
Replace ECM (para 7-29.1).
Then go to 34-30.
Repair terminals/connectors
(para 7-77). Then go to 34-30.
H-171
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