Section 133.1
SPN 4259/FMI 3
This diagnosis is typically injector unit pump control valve cylinders #4, 5, or 6 circuit is shorted to battery/power.
Section 133.1.1
Short to Battery/Power Check
Check as follows:
- Turn the ignition OFF.
- Disconnect the MCM 120–pin connector.
- Using the J-48475 breakout box and appropriate overlay, connect the MCM side of the harness ONLY.
- Turn the ignition ON (key ON, engine OFF).
- Measure the voltage between pin 5 of the J-48475
breakout box and ground.
- If voltage is greater than 0.5 V, contact the Detroit Diesel Customer Support Center at 313–592–5800 for authorization to replace the MCM..
- If no voltage is present, go to the next step.
- Turn the ignition OFF.
- Connect the Engine Harness side of the J-48475 breakout box.
- Turn the ignition ON (key ON, engine OFF).
- Disconnect the #4 unit pump.
- Measure the voltage between pin 4 of the MCM 120–pin connector and ground.
- If voltage is present, repair the short circuit to power between pin 4 of the MCM 120–pin connector and the #4 unit pump. See Figure "Unit Pumps #4, 5, and 6" . Refer to "133.2.1.1 Verify Repairs" .
- If no voltage is present, go to the next step.
Figure 1. Unit Pumps #4, 5, and 6
- Disconnect the #5 unit pump.
- Measure the voltage between pin 8 of the MCM 120–pin connector and ground.
- If voltage is present, repair the short circuit to power between pin 8 of the MCM 120–pin connector and the #5 unit pump. See Figure "Unit Pumps #4, 5, and 6" . Refer to "133.2.1.1 Verify Repairs" .
- If no voltage is present, go to the next step.
- Disconnect the #6 unit pump.
- Measure the voltage between pin 6 of the MCM 120–pin connector and ground.
- If voltage is present, repair the short circuit to power between pin 6 of the MCM 120–pin connector and the #6 unit pump. See Figure "Unit Pumps #4, 5, and 6" . Refer to "133.2.1.1 Verify Repairs" .
- If no voltage is present, repair the short circuit to power between pins 6, 7 and/or 8 of the MCM 120–pin connector and unit pumps #4, 5, or 6. See Figure "Unit Pumps #4, 5, and 6" . Refer to "133.2.1.1 Verify Repairs" .
EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580 |
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