Mcm 120–Pin Connector - Detroit Diesel Series 60 DDEC VI Troubleshooting Manual

13.1 SPN 174/FMI 3
[a] If the voltage is between 2.75 and 3.25 volts, repair the open circuit between
pin 1 of the SFT Sensor harness connector and pin 55 of the 120–pin MCM
connector.See Figure 13-2. Refer to section 13.1.1.1.
[b] If the voltage is less than 2.75 volts, repair the open circuit between pin 2 of the SFT
Sensor harness connector and pin 77 of the 120–pin MCM connector.See Figure
13-2. Refer to section 13.1.1.1.
Figure 13-2 MCM 120–pin Connector
7. Disconnect the 120–pin MCM connector and measure the resistance between pins 1
and 2 of the SFT Sensor harness connector.
[a] If the resistance is less than 5 Ω, repair the short between pins 55 and 77 of the
120–pin MCM connector. Refer to section 13.1.1.1.
[b] If the resistance is greater than 5 Ω, replace the sensor. Refer to section 13.1.1.1.
13.1.1.1 Verify Repairs
Verify repairs as follows:
1. Turn the ignition OFF and reconnect all connectors.
2. Turn ignition ON. Clear codes.
3. Start and run the engine for eight minutes. Stop engine.
4. Check diagnostic tool for codes.
[a] If no codes are logged, no further troubleshooting is required.
13-4
PRELIMINARY 6SE567 0512 Copyright © 2005 DETROIT DIESEL CORPORATION
All information subject to change without notice.