Perkins 1104E Series Troubleshooting Manual page 150

150
Troubleshooting Section
Test Step 3. Check the Battery Voltage at
the ECM.
Illustration 66
Test points for the Breakout T.
A. Disconnect engine harness connector P1 from
ECM connector J1 and insert a 70 Pin Breakout T.
B. Reconnect the harness.
C. Turn the keyswitch to the ON position.
D. Measure the voltage between P1:56 (unswitched
positive battery) and P1:68 (negative battery).
E. Measure the voltage between P1:57 (unswitched
positive battery) and P1:69 (negative battery).
Refer to Illustration 66 for the ECM Breakout
T-connector.
Expected Result:
The measured voltage is between 11.0 VDC and 13.5
VDC for a 12 volt system and between 22.0 VDC and
27.0 VDC for a 24 volt system with no suspected
intermittent problems at this time.
If the ECM is receiving the correct voltage, proceed
to Test Step 4.
If the ECM is not receiving the correct voltage
and an intermittent condition is suspected, refer to
Troubleshooting, "Electrical Connectors - Inspect".
Repair any damaged connectors or damaged wiring
and/or replace any damaged connectors or damaged
wiring. Verify that the repairs eliminate the problem
and proceed to Test Step 4.
If the voltage at the keyswitch is out of the nominal
range, trace the wiring for the keyswitch from the
ECM through the keyswitch circuit to the batteries.
Identify the problem and repair the problem. Check
the circuit protection for the circuit and for the wiring.
Verify that the repairs eliminate the problem.
Results:
•
OK – Proceed to Test Step 4.
Test Step 4. Use the Bypass Harness for
the Electronic Service Tool to Bypass the
Machine Wiring.
Batteries give off flammable fumes which can ex-
plode.
To avoid injury or death, do not strike a match,
cause a spark, or smoke in the vicinity of a battery.
NOTICE
Do Not connect the bypass harness to the battery un-
til the 20 Amp in-line fuse has been removed from the
+battery line. If the fuse is not removed before con-
nection to the battery, a spark may result.
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