TM 9-2320-383-20-1
Section 4
TROUBLESHOOTING CHARTS
E. CODE43- LOW COOLANT
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.
. . .
When Mode 02 (Historical Codes) is displayed on the DDR, additional audit trail information is also shown. For an understanding of this information,
refer to the example given in the Code 85 chart
43.1 Multiple Code Check
l Were there any other active codes
besides Code 43?
43-2 Check Coolant Level
l Check if coolant level is full.
43.3 Clean Coolant Level
Sensor
l Turn ignition off.
l Disconnect wires to CLS probe.
l unscrew CLS probe.
l Wipe probe clean with a clean rag.
l Reinstall probe.
l Connect wires to CLS probe.
l Turn ignition on.
. Clear codes.
l Start and run engine until the “Stop
Engine” light comes on or for 1
minute.
l Stop engine.
l Read historical codes.
43.6 Ground Wire Check
l Turn ignition off.
l Disconnect CLS connector.
l Read resistance between socket
C of the CLS harness connector
and a good battery ground (also
try shaking the wire while reading
resistance).
Code 25 (no codes)
Code 43 (and
any other code).
Any other codes —
except Code 43.
or equal to 5 ohms.
G r e a t e r t h a n —
5 ohms or open.
WHAT TO DO NEXT
coolant, page 4-98, and refill
radiator. Then go to 43-30.
Repairs are complete.
to service other codes
page 4-240, Then go to 43-30.
-The CLS ground has a bad
cmnection or is open. Replace
wire in pin C of the CLS
connector Run it to a good
battery ground. Do not use
chassis ground. Then go to
43-30.
3-293
