Troubleshooting

118 RENR2696-01
Troubleshooting Section
C. Turn the keyswitch to the ON position.
D. Measure the voltage between terminal J40:7 and
terminal J40:6.
E. Turn the keyswitch to the OFF position.
F. Reconnect the
P40 connector.
Expected Result:
The voltage for a 12 V system should be constant.
The voltage should be between 11.0 volts and 13.5
volts.
The voltage for a 24 volt system should be constant.
The voltage sh
ould be between 22.0 volts and 27.0
volts.
Results:
•
OK
Repair: Perform the following repairs:
1. Temporarily
connect a test ECM.
Note: ThetestECMshouldbeprogrammedwiththe
correct soft
ware. All parameters should be set to the
same value as the suspect ECM.
2. If the fault i
seliminatedwiththetestECM,
reconnect the suspect ECM.
3. If the fault r
eturns with the suspect ECM, then
the suspect ECM is faulty. Replace the suspect
ECM.
STOP.
•
Not OK – No vo
ltage or the voltage is less than
the permissible limit.
Repair: Ref
er to Troubleshooting, “Fuel Injection
Pump Circuit - Test”.
Verify that
the repair has eliminated the fault.
STOP.
i01798198
Data Link Circuit - Test
System Ope
ration Description:
Use this procedure under the following
circumsta
nces:
Use this procedure if the electronic service tool will
not communicat
e with the Electronic Control Module
(ECM) through the data link. If the electronic service
tool will not power up, refer to Troubleshooting,
“Electrical P
ower Supply Circuit - Test”.
Use this test if the Engine Monitoring System
(EMS) displa
ys “Error” or incorrect values are being
displayed. An incorrect value may be “0” for engine
speed.
The following background information is related
to this procedure:
The Data Link is the standard Data Link that is
used by the ECM in order to communicate with the
electronic s
ervice tool.
The ECM provides the following two connections for
the Data Lin
k from the ECM connector J1:
•
J1:5 ( Data Link Negative) to J20:5
•
J1:4 ( Data Link Positive) to J20:4
Communicat
ion
The electronic service tool may indicate the following
error messa
ge:
•
The version of the ECM is not recognized and the
integrity o
f the changed parameters and displayed
data is not guaranteed.
This messag
e will indicate that the version of the
software that is in the electronic service tool is not
the same version of the software that is in the ECM.
Contact th
e Perkins Technical Service Centre in
order to confirm the correct version of the software.