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TM 9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. VEH5V - VEHICLE HARNESS +5 VOLTS SUPPLY
STEP/SEQUENCE
VEH5V-1
Check for Low
Battery Voltage
Was there also a Code 168/1 ?
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 H-25 and you have now been referred here.
RESULT
WHAT TO DO NEXT
Yes.
Go to 46-1 (page H-217)
No.
Go to VEH5V-2.
VEH5V-2
Check for +5 Volts
at TPS
Turn ignition off.
Disconnect the Throttle Position
Sensor (TPS) connector.
Turn ignition on.
Read voltage on the TPS
connector, pin C (red lead) to pin
A (black lead).
VEH5V-3
Check for +5 Volts
or Return Open
Turn ignition off.
Disconnect the vehicle harness
connector at the ECM.
Install a jumper wire between pins
A and C of the TPS connector.
Read resistance between sockets
A3 and C3 of the vehicle harness
connector.
Less than
4.7 volts.
Go to VEH5V-3.
Greater than
5.2 volts.
Go to VEH5V-11.
Between 4.7
and 5.2 volts.
Go to VEH5V-8.
Less than
or equal to 5 ohms.
o to VEH5V-4.
Greater than
5 ohms or open.
Either the engine +5 volt line
(ckt #916) or the sensor return
line (ckt #952) is open. Repair
open. Then go to VEH5V-30.
H-247
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