12 12-13
1212-13
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12 12-13
SUBJECT
DATE
SPN 3246/FMI 7 (ACM2.1) (GHG14)
December 2013
Additions, Revisions, or Updates
Publication Number / Title
Platform
Section Title
Change
DDC-SVC-MAN-0084
DD Platform
SPN 3246/FMI 7 GHG14
Correction to refer to DPF outlet temperature sensor replacement
procedure. Step 11, added pin inspection for connectors when
disconnected.
All information subject to change without notice.
1212-13 Copyright © 2014 DETROIT DIESEL CORPORATION
3
2 SPN 3246/FMI 7 - GHG14
2
SPN 3246/FMI 7 - GHG14
This diagnostic is typically Diesel Particulate Filter (DPF) Outlet Temperature Sensor Not Responding.
Table 1.
SPN 3246/FMI 7 - GHG14
Description
Diesel Particulate Filter (DPF) Outlet Temperature Sensor Not
Responding
Monitored Parameter
DPF Outlet Temperature Sensor
Typical Enabling Conditions
Always Enabled
Monitor Sequence
None
Execution Frequency
Continuous when enabling conditions are met
Typical Duration
5 seconds
Dash Lamps
MIL/CEL
Engine Reaction
None
Verification
Parked Regen
1. Check for multiple fault codes.
a. If SPN 3246/FMI 3, 4 or 8 is present, repair those faults first. Verify repair.
b. If only the SPN 3246/FMI 7 is present. Go to step 2.
2. Turn the ignition key ON (Key ON, Engine OFF). Go to step 3.
3. Connect DDDL/DDRS version 7.10 or newer. Go to step 4.
4. Compare the Diesel Oxidation Catalyst (DOC) outlet temperature and Diesel Particulate Filter (DPF) outlet
temperature. Go to step 5.
5. Is the DOC outlet temperature within 7°C (45°F) of the DPF outlet temperature sensor?
a. Yes; Go to step 6.
b. No; Go to step 10.
WARNING: ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area.
Engine exhaust is toxic.
WARNING: PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level
surface, parking brake is set, and the wheels are blocked.
6. Start the engine. Go to step 7.
7. Compare the DOC outlet temperature and the DPF outlet temperature while the engine is idling. Go to step 8.
8. Are the DOC outlet temperature and the DPF outlet temperatures within 7°C (45°F) of each other?
a. Yes; Go to step 9.
b. No; Go to step 10.
9. Continue idling the engine for 10 minutes. Are the DOC outlet temperature and the DPF outlet temperature within 7°C
(45°F) of each other?
a. Yes; Clear the faults and release the vehicle.
b. No; Go to step 10.
10. Disconnect the DOC outlet temperature sensor harness connector. Go to step 11.
11. Inspect the harness for bent, spread or corroded pins.
a. If no damage is found, Go to step 12.
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All information subject to change without notice.
Copyright © 2014 DETROIT DIESEL CORPORATION 1212-13
1212-13
b. If there is damage found, repair as necessary. Verify repair.
12. Measure the resistance across the DOC outlet temperature sensor and compare the resistance readings to the chart
below. Go to step 13.
Table 2.
DOC Outlet Temperature Sensor Temperature Ranges
Temp °C (°F)
Min Resistance
Max Resistance
Min Voltage
Max Voltage
0 (32)
197.67
207.62
0.491
0.520
10 (50)
205.33
215.24
0.506
0.536
25 (77)
216.77
226.24
0.530
0.559
50 (122)
235.72
245.52
0.567
0.597
100 (212)
273.19
282.83
0.638
0.667
150 (302)
310.07
319.56
0.704
0.733
200 (392)
346.36
355.70
0.765
0.794
300 (572)
416.47
429.09
0.874
0.909
400 (752)
484.17
498.84
0.970
1.007
13. Is the DOC outlet temperature sensor resistance within range of the temperature?
a. Yes; Go to step 14.
b. No; replace the DOC outlet temperature sensor. Refer to section "Removal of the GHG14 Diesel Oxidation
Catalyst Outlet Temperature Sensor". Verify repair.
14. Disconnect the DPF outlet temperature sensor connector. Go to step 15.
15. Inspect the harness for bent, spread or corroded pins.
a. If no damage is found, Go to step 16.
b. If there is damage found, repair as necessary. Verify repair.
16. Measure the resistance across the DPF outlet temperature sensor and compare the readings to the chart below. Go to
step 17.
Table 3.
DPF Outlet Temperature Sensor Temperature Ranges
Temp °C (°F)
Min Resistance
Max Resistance
Min Voltage
Max Voltage
0 (32)
197.67
207.62
0.491
0.520
10 (50)
205.33
215.24
0.506
0.536
25 (77)
216.77
226.24
0.530
0.559
50 (122)
235.72
245.52
0.567
0.597
100 (212)
273.19
282.83
0.638
0.667
150 (302)
310.07
319.56
0.704
0.733
200 (392)
346.36
355.70
0.765
0.794
300 (572)
416.47
429.09
0.874
0.909
400 (752)
484.17
498.84
0.970
1.007
17. Is the DPF outlet temperature sensor resistance within range of the temperature?
a. Yes; Clear the faults and release the vehicle.
b. No; Replace the DPF outlet temperature sensor. Refer to section "Removal of the GHG14 Diesel Particulate
Filter Outlet Temperature Sensor". Verify repair.
All information subject to change without notice.
1212-13 Copyright © 2014 DETROIT DIESEL CORPORATION
5
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