STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. VEH5V - VEHICLE HARNESS +5 VOLTS SUPPLY
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-III was started at step Start-1, pg 3-345.41 and you have now been referred here.
VEH5V-1
Check for Low
Battery Voltage
Was there also a Code 168/1?
Yes.
Go to 46-1 (page 3-345.339).
No.
B Go to VEH5V-2.
VEHSV-2
Check for + 5 Volts
at TPS
Turn ignition off.
Less than
Go to VEH5V-3.
Disconnect the Throttle Position
4.7 volts.
sensor (TPS).
Turn ignition on.
Greater than
Go to VEH5V-11.
Read voltage on the TPS harness
5.2 volts.
connector, pin C (red lead) to pin
A (black lead).
Between 4.7
Go to VEH5V-8
and 5.2 volts.
VEH5V.3
Check for +5 Volts
or Return Open
Turn ignition off.
Less than
Go to VEH5V-4
Disconnect the vehicle harness
or equal to 5 ohms.
connector at the ECM.
Install a jumper wire between pins
Greater than
Either the engine +5 volt line
A and C of the TPS harness
5 ohms or open.
(ckt #916) or the sensor return
Connector.
line (ckt #952) is open. Repair
Read resistance between sockets
open. Then go to VEH5V-30.
A3 and C3 of the vehicle harness
connector.
Change 3 3-345.419
