Description
1. 06 12-16
Additions, Revisions, or Updates
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2. SPN 175/FMI 4 – GHG17
Engine Oil Temperature Circuit Failed Low
Table 1.
Check as follows:
1 . Disconnect and inspect the Engine Oil Temperature sensor electrical connector harness side. Is there corrosion present in the connector?
a. Yes; replace the Engine Oil Temperature sensor and the electrical connector. Refer to section “Removal of the
Engine Oil Temperature Sensor” and Technical Service letter 13 TS-16 (http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/13TS16.pdf) . Verify repair.
b. No; Go to step 2.
2. Inspect the Engine Oil Temperature sensor electrical connector harness side. Are the pins or the connector damaged?
a. Yes; Go to step 3.
b. No; Go to step 4.
3. Inspect the Engine Oil Temperature sensor electrical connector component side. Are the pins or the connector
damaged?
a. Yes; replace the Engine Oil Temperature sensor and the electrical connector. Refer to section “Removal of the
Engine Oil Temperature Sensor” and Technical Service letter 13 TS-16 (http://ddcsn-
ddc .freightliner.com/cps/rde/xbcr/ddcsn/13TS16.pdf) . Verify repair.
b. No; replace the Engine Oil Temperature electrical connector. Refer to Technical Service letter 13 TS-16 (http://
ddcsn-ddc .freightliner.com/cps/rde/xbcr/ddcsn/13TS16.pdf) . Verify repair.
4. With the Engine Oil Temperature sensor disconnected, tum the ignition ON (Key On, engine OFF).
5. Is fault code SPN 175/FMI 4 still active?
a. Yes; Go to step 6.
b. No; replace the Engine Oil Temperature sensor. Refer to section “Removal of the Engine Oil Temperature
Sensor”. Verify repair.
6. Tum the ignition OFF.
7. Disconnect and inspect the MCM 120-pin electrical connector harness side. Are the pins or the connector damaged?
a. Yes; Go to step 8.
b. No; Go to step 9.
8. Inspect the MCM 120-pin electrical connector component side. Are the pins or the connector damaged?
a. Yes; replace the MCM and the engine harness. Refer to section “Removal of the Motor Control Module”.
Verify repair.
b. No; replace the engine harness. Verify repair.
9. Measure the resistance between pin 2 of the engine oil temperature sensor electrical connector harness side and pin 108 of the MCM 120-pin electrical connector harness side. Is the resistance less than 10k ohms?
a. Yes; repair the short to ground between pin 2 of the Engine Oil Temperature sensor electrical connector harness side and pin 108 of the MCM 120-pin electrical connector harness side. Verify repair.
b. No; replace the MCM. Refer to section “Removal of the Motor Control Module”.Verify repair.
3. SPN 175/FMI 4 – EPA07 – EPA10 – GHG14
Engine Oil Temperature Circuit Failed Low
Table 2.
1 . Disconnect and inspect the Engine Oil Temperature sensor electrical connector harness side. Is there corrosion present in the connector?
a. Yes; replace the Engine Oil Temperature sensor and the electrical connector. Refer to section “Removal of the
Engine Oil Temperature Sensor” and Technical Service letter 13 TS-16 (http://ddcsn-ddc .freightliner.com/cps/rde/xbcr/ddcsn/13TS16.pdf) . Verify repair.
b. No; Go to step 2.
2. Inspect the Engine Oil Temperature sensor electrical connector harness side. Are the pins or the connector damaged?
a. Yes; Go to step 3.
b. No; Go to step 4.
3. Inspect the Engine Oil Temperature sensor electrical connector component side. Are the pins or the connector
damaged?
a. Yes; replace the Engine Oil Temperature sensor and the electrical connector. Refer to section “Removal of the
Engine Oil Temperature Sensor” and Technical Service letter 13 TS-16 (http://ddcsn-
ddc .freightliner.com/cps/rde/xbcr/ddcsn/13TS16.pdf) . Verify repair.
b. No; replace the Engine Oil Temperature electrical connector. Refer to Technical Service letter 13 TS-16 (http://
ddcsn-ddc .freightliner.com/cps/rde/xbcr/ddcsn/13TS16.pdf) . Verify repair.
4. With the Engine Oil Temperature sensor disconnected, tum the ignition ON (Key ON, engine OFF).
5. Is fault code SPN 175/FMI 4 still active?
a. Yes; Go to step 6.
b. No; replace the Engine Oil Temperature sensor. Refer to section “Removal of the Engine Oil Temperature
Sensor”. Verify repair.
6. Tum the ignition OFF.
7. Disconnect and inspect the MCM 120-pin electrical connector harness side. Are the pins or the connector damaged?
a. Yes; Go to step 8.
b. No; Go to step 9.
8. Inspect the MCM 120-pin electrical connector component side. Are the pins or the connector damaged?
a. Yes; replace the MCM and the engine harness. Refer to section “Removal of the Motor Control Module”.
Verify repair.
b. No; replace the engine harness. Verify repair.
9. Measure the resistance between pin 2 of the engine oil temperature sensor electrical connector harness side and pin 108 of the MCM 120-pin electrical connector harness side. Is the resistance less than 10k ohms?
a. Yes; repair the short to ground between pin 2 of the Engine Oil Temperature sensor electrical connector harness side and pin 108 of the MCM 120-pin electrical connector harness side. Verify repair.
b. No; replace the MCM. Refer to section “Removal of the Motor Control Module”. Verify repair.
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