Section
4
TROUBLESHOOTING
CHARTS
E. CODE 34-
TURBO
BOOST
SENSOR
(TBS) SIGNAL
VOLTAGE
LOW
N0TE — This chart is only to be used if:
1) Allbasic mechanical checks and physical inspections have been performed with no problem found, and
2) Diagnosis of DDEC-II was startedatstepStart-1(page 3-121) andyou have now been referred here.
TM9-2320-363-20-1
34-1
Multiple Code Check
l Were there any other active codes
besides Code 34?
34-2
Sensor Check
l Turn ignition off.
l Disconnect TBS connector.
l Install a jumper wire between
sockets B and C of the TBS
harness connector.
l Turn ignition on.
l Read active codes.
l if active Code 33 or 34 exists go
to RESULT column.
l If no active Code 33 or 34 exists,
start engine and run until either
the “Check Engine” light comes
on or the engine has been running
warm for at least one minute at
greater than 1000 RPM.
l Read active codes.
34-3
Check TBS
Connectors
l Inspect terminals at the TBS
connectors (sensor side and
harness side) for damage; bent,
corroded, and unseated pins or
sockets.
RESULT
I
WHAT TO DO NEXT
No other codes. Goto34-2.
Yes, any or all Go
to ENG5V-1 (page 3-333).
of the following codes:
14-15,23,33,35-38.
Yes - but none of the
Go to 34-2
above
Code 33 (and
any other codes
except Code 34).
Code 34 (and any
other codes).
Terminals and
connectors are okay.
Problem found
Go
to 34-3.
Go
to 34-4.
Replace
TBS, page 4-328.
Then go to 34-30.
Repair terminals/connectors,
page 3-2. Then go to 34-30.
3-255
