SPN 1675 - FMI 5 (Diagnostic Code: Starter Motor Relay - Current Below Normal)
Fracturing Transmission (TH55-E70)
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| Figure 1.1 - Starter Motor Relay (444-5) |
MID 027 CID 0444 FMI 05
#Condition Which Generate this Code:
This Diagnostic Code is associated with the Starter Relay.
The FMI 05 means that the ECM has determined that an open in the circuit
exists.
The possible causes of this Diagnostic Code are listed
below:
- The
energize circuit of the relay is open.
- The
return circuit of the relay is open.
- The
relay has failed.
- The
ECM has failed. This is unlikely.
Test Step 1. CHECK THE RELAY.
A). Turn
the disconnect switch and the key start switch to the ON position. Do not
start the Engine.
B). Disconnect
the relay with the active Diagnostic Code from the machine harness.
C). At the
machine harness connector for the relay, place a jumper wire from contact
1 to contact 2.
D). Observe
the status of the code.
Expected Result: The Diagnostic Code is active. Then, the Diagnostic Code
changes from FMI 05 to FMI 06 as the jumper wire is installed.
Results:
→YES
- The Diagnostic Code remains active. The jumper wire does not
affect the Diagnostic Code. Proceed to Test Step 2.
→NO
- The Diagnostic is no longer active. The relay has failed.
→Repair: The relay has failed. Replace the relay. Verify that the new relay corrects the problem.
 |
| Figure 1.2 - Starter Relay (Current Below Normal) |
Test Step 2. CHECK THE HARNESS FOR AN OPEN.
A). Turn
the key start switch and the disconnect switch to the OFF position.
B). Disconnect
the machine harness connector(s) from the ECM.
C). The
jumper wire that was installed in the previous Test Step remains in place.
D). At the
machine harness connector, measure the resistance from signal contact J2-7
(wire 306-GN/Green) to contact J2-22 (wire K972-BR/Brown).
Expected Result: The resistance is less than 5.0 ohms.
Results:
→OK
- The resistance is less than 5.0 ohms. The machine harness is
correct. Proceed to Test Step 3.
→NOT
OK - The resistance is greater than 5000 ohms. The resistance
measurement is not correct. There is an open circuit in the machine
harness.
→Repair: Repair the machine harness or replace
the machine harness.
Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
A). Inspect
the harness connectors. Clean the contacts of the harness connectors and
check the wires for damage to the insulation that is caused by excessive
heat, battery acid, or chafing.
B). Perform
a 45 N (10 lb) pull test on each of the wires that are
associated with the circuit.
C). Reconnect
all harness connectors. Make sure that the connectors are fully seated and
that the clips for each connector are completely fastened.
D). Turn
the disconnect switch and the key start switch to the ON position.
E). Operate
the machine.
F). Check
the status of the CID 0444 FMI 05.
Expected Result: The CID 0444 FMI 05 is active.
Results:
→YES
- The CID 0444 FMI 05 is active. The Diagnostic Code has not been
corrected.
→Repair: Check the circuit again. If the
Caterpillar Electronic Technician (Cat ET) is available, use the Cat ET service
tool in order to perform a Wiggle Test on the machine wiring harness. The Wiggle Test can detect shorts and opens in the machine wiring harness that
are momentary or intermittent. Read More: Wiggle Test on Caterpillar ET Software.
→It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the Diagnostic Code is not found, replace the ECM.
→NO
- The CID 0444 FMI 05 is not active. The Diagnostic Code does not
exist at this time.
→Repair: The initial Diagnostic Code was probably
caused by a poor electrical connection at one of the harness connectors that
was disconnected and reconnected. Resume normal machine operation.
 |
| Figure 1.3 - Starter Relay (Off) |
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