Section 4
TROUBLESHOOTING
CHARTS
E. CODE 33-
TURBO BOOST SENSOR (TBS)SIGNAL
VOLTAGE HIGH
NOTE — This chart is only to be used if:
1) All basic mechanical checks and physical inspections have been performed with no problem found, and
2) Diagnosis of DDEC-II was started at step Start-1 (page 3-121 ) and you have now been referred here.
33-1
Multiple Code Check
l Were there any other active codes
besides code 33?
33-2
Sensor Check
l Turn ignition off.
l Disconnect TBS Connector.
l Start and run engine at idle.
l Read active codes.
33-3
Return Circuit Check
l Turn ignition off.
l Install a jumper wire between pins
A and B of the TBS harness
connector.
l Disconnect the engine harness
connector at the ECM.
l Read resistance between sockets
PI and Y2 on the engine harness
connector.
334
Check TBS
Connectors
l inspect terminals at the TBS
connectors (sensor side and
harness side) for damage; bent,
corroded, and unseated pins or
sockets.
No other codes.
Yes, any or all
of the following codes:
14-15,23,34-38.
Yes - but none of the
above
Code 34 (and
any codes except
Code 33).
Code 33 (and
any other codes).
Less than or
equal to 5 ohms.
Greater than
5 ohms or open.
Terminals and
connectors are okay.
Problem found.
TM9-2320-363-20-1
WHAT TO DO NEXT
Go to 33-2.
Go to ENG5V-1 (page 3-333).
GO
to 33-2.
Go
to 33-3.
GO
to 33-5.
GO
to 33-4.
Return line (ckt #452) is open.
Contact Direct Support.
Replace TBS, page 4-328.
Then go to 33-30.
Repair terminals/connectors,
page 3-2. Then go to 33-30.
3-249
