Troubleshooting

150 RENR2696-01
Troubleshooting Section
Test Step 3. Check the Battery Voltage at
the ECM.
g00955807
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 t
he 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).
RefertoIllustration66fortheECMBreakout
T-connector.
Expected Result:
The measur
ed 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
intermit
tent problems at this time.
If the ECM is receiving the correct voltage, proceed
to Test St
ep 4.
If the ECM is not receiving the correct voltage
andanint
ermittent condition is suspected, refer to
Troubleshooting, “Electrical Connectors - Inspect”.
Repair any damaged connectors or damaged wiring
and/or r
eplace 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 thro
ugh 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 th e
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.