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Page Title:
CRANE HIGH IDLE NOT WORKING (CONT). |
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 TM 9-2320-364-20-1
D4 CRANE HIGH IDLE NOT WORKING (CONT).
2.
KNOWN INFO
TEST OPTIONS
Para 2-29, Fault 19
DDR test.
Does PTO RPM change
Troubleshooting completed.
smoothly from idle to
Throttle position sensor OK.
REASON FOR QUESTION
1250 50?
POSSIBLE PROBLEMS
DDEC ECM may be faulty if it
fails to read vernier control.
DDEC ECM faulty.
Damaged DDEC ECM terminals
or connectors.
Open in signal or ground
wire 510/1525 or 952.
Open in +5 volt wire 916.
Short in signal or ground
wire 510/1525 or 952.
Short in +5 volt wire 916.
Go to Step 5 of this
Damaged vernier control
NO
Fault.
terminals or connectors.
Vernier control faulty.
YES
3.
KNOWN INFO
TEST OPTIONS
Para 2-29, Fault 19
DDR test.
Does engine RPM increase
Troubleshooting completed.
when HIGH IDLE switch is set
Throttle position sensor OK.
REASON FOR QUESTION
to LATCH?
DDEC ECM is reading vernier
control.
Isolate Fault.
POSSIBLE PROBLEMS
DDEC ECM faulty.
Damaged DDEC ECM terminals
or connectors.
Open in signal or ground
wire 510/1525 or 952.
Open in +5 volt wire 916.
Problem is
Short in signal or ground
intermittent.
wire 510/1525 or 952.
NO
Go to DDEC
Short in +5 volt wire 916.
Troubleshooting Fault
Damaged vernier control
terminals or connectors.
Vernier control faulty.
YES
2-460
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