TSB1200600108201

CM2250 Engine Control Module (ECM) Malfunctions Due to Incorrect Switch Input Wir... Page 1 of 3
Technical Service Bulletin
Technical Service Bulletin:
Released Date: 08-Jan-2019
TSB120060
CM2250 Engine Control Module (ECM) Malfunctions Due to Incorrect Switch
Input Wiring
CM2250 Engine Control Module (ECM)
Malfunctions Due to Incorrect Switch Input
Wiring
Core Issue
Symptom
• Engine control module (ECM) switch inputs, such as the power take-off
(PTO)/Accelerator Interlock/Oil Pressure switch, are inoperable.
• Fault Codes 175, 176, and 415.
Root Cause
• The ECM switch inputs are wired incorrectly.
Confirmation
Perform the following steps to check and verify that the ECM switch inputs are wired
correctly.
• Remove the original equipment manufacturer (OEM) connector from the ECM.
• Use a multimeter to measure for voltage between pins 24 through 30, 36 through 40,
49, 50, 59, 60, and ECM switch RETURN pin 19 at the OEM harness connector.
Note : The specific pins used in the connector depend on what switches were
installed by the OEM.
• Toggle the switch to ground inputs and check for battery voltage with the keyswitch
in both the ON and OFF positions.
The multimeter must show no voltage. If any voltage is observed, the switch must be
wired correctly before the ECM is installed.
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1/28/2019
CM2250 Engine Control Module (ECM) Malfunctions Due to Incorrect Switch Input Wir... Page 2 of 3
Reference the circuit diagram or wiring diagram for connector pin identification.
Use the following procedure for general multimeter usage techniques. Refer to
Procedure 019-359 in Section 19 (/qs3/pubsys2/xml/en/procedures/99/99-019-359.html)
of the appropriate service manual
Note : The resistance measurement given in this document of 0.020 Ohms is
different than the Service Manual specification.
Perform the following steps to check and verify that the ECM power return (ground) wires
are grounded correctly.
• Disconnect the batteries. See equipment manufacturer service information.
• Use a multimeter to measure the resistance between the OEM connector ECM
ground return pins and Battery (-) cable connection.
• The multimeter ohm reading must be less than 0.020 Ohms. If reading is not less
than 0.020 Ohms, the high resistance ground connection must be corrected.
• Reconnect batteries. See equipment manufacturer service information.
• With all components connected, use a multimeter to measure the voltage between
the engine ECM block ground stud and battery negative connection with the
following conditions met in order:
◦ Key off
◦ Key on; engine not running
◦ Key on; engine running and electrical accessories on
• The multimeter must show less than 0.5VDC. If voltage is not less than 0.5VDC,
the high resistance ground connection must be corrected.
Reference the circuit diagram or wiring diagram for connector pin identification.
Use the following procedure for general multimeter usage techniques. See the
corresponding Service Manual. Reference Procedure 019-359 in Section 19.
Resolution
If any of the pins show a voltage with the multimeter when the switches are toggled, the
switch must be wired correctly, so an open or ground is observed. If the ECM is installed
before the switch is wired correctly, the ECM will be susceptible to repeat malfunctions.
Note : Subsequent damage to the ECM, caused by failure to rewire the
incorrectly wired switches prior to ECM installation, will not be warrantable.
ECM power return (ground) wiring must be connected to the engine block ground stud
and then return from the engine block to the battery by a low resistance circuit of 0.020
Ohms or less between the ECM and battery.
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2012/tsb120060.html
1/28/2019
CM2250 Engine Control Module (ECM) Malfunctions Due to Incorrect Switch Input Wir... Page 3 of 3
Sustained voltage differential or peak-peak voltage differential levels between the engine
ECM block ground stud and battery negative not to exceed 0.5VDC.
Warranty Statement
The information in this document has no effect on present warranty coverage or repair
practices, nor does it authorize TRP or Campaign actions.
Document History
Date
Details
2012-2-29
Module Created
2012-3-27
QSOL Quick Fix|Reason: Spelling Error|Notes: none
2012-10-5
QSOL Quick Fix|Reason: Incorrect Part Number|Notes: none
2013-12-5
Add CM2350 Pins
2014-6-10
none
2016-3-17
Added ground wiring verification for CM2250 and CM2350
Modules.
2019-1-7
Split CM2350 to new TSB, removed references.
Last Modified: 08-Jan-2019
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2012/tsb120060.html
1/28/2019