STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
D. CHART - 7 - NO DATA TO DDR (Cont'd)
C 7-4
Check for Open Light
Turn off ignition.
Greater than
One or both data wires (ckt #900
Place a jumper wire across pins
5 ohms.
or #901) is open. Repair open
- A (#900) and B (#901) of DDL
and go to C7-30.
connector.
Unplug vehicle harness connector
Less than
Go to C7-5.
and measure resistance between
5 ohms.
sockets C1 and C2.
C 7-5
Check for Short
Remove jumper wire from DDL
Less than
Two data wires are shorted
connector.
5 ohms.
together (ckt #900 and #901).
Read resistance between sockets
Repair short and go to C7-30.
C1 (#901) and C2 (#900)
of vehicle harness connector.
Greater than
Go to C7-6.
5 ohms.
C 7-6
Check for Short to
Ignition and Ground
Remove all jumpers for the DDL
Less than
A short exists between a data
connector.
5 ohms on any reading.
wires and ignition or ground.
Measure resistance between
Repair short and go to C7-30.
socket A (#900) and E (ground),
A (#900) and C (sw-ign),
B (#901) and E (ground), and B
(#901) and C (sw-ign) of DDL
Greater than
Go to C7-7.
connector.
5 ohms on any reading.
C 7-7
Check DDR on
Another Engine
Connect DDR to another engine
Works okay.
Go to C7-30.
and read any parameter in menu.
Does not work
DDR is probably defective. See
DDR instruction manual for
repair.
Change 3 3-345.101
