STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE: 27
J1587 CODE:
P172 3. AIR TEMPERATURE CIRCUIT FAILED HIGH (HIGH VOLTAGE)
27-5
Check ECM
Connectors
Check terminals at the ECM
Terminals and
Reprogram ECM. Then go to
engine harness connector
connectors are okay.
27-30.
(both the ECM and harness side)
for damage; bent, corroded, and
Problem found.
Repair terminals/connectors.
unseated pins or sockets.
Then go to 27-30.
27.30
Verify Repairs
Turn ignition off.
(No codes).
Repairs are complete.
Reconnect all connectors.
Turn ignition on.
Code 172/3 (and
All system diagnostics are
Clear codes.
any other codes).
complete. Please review this
Note status of "Check Engine"
section from the start to find
light.
the error.
`If "Check Engine" light does not
stay on, start engine and run until
Any other codes
Go to START-1, pg 3-345.41,
"Check Engine" light comes on
except Code 172/3.
to service other codes.
or 8 minute. Stop engine.
Read inactive codes.
Change 3 3-345.261
