Detroit 12.7 derating
 

I am having problems with the series 60 in our 98 Peterbilt. I seems like its being derated for some reason but a haven't been able to figure out what and never have the time to get it to the mechanic we use. A month or so ago I was in an ice storm with a heavy load and the grill was getting covered with ice and the motor warmed up just enough to make the engine fan come on. Anyways, while it was running warm, it ran perfect. Had all kinds of power like it should. BTW, it is a fairly strong 12.7, started life as a 470 motor but has put down 478 at the rear wheels. Anyways, my question is what sensors could go bad that could derate the motor. I have already replaced the boost sensor, fuel temp sensor, and the intake air temp sensor. I am sure that the is something dumb, but I just can't seem to figure it out. Thanks for any help.

I would check the air filter for icing and change out both fuel filters. I cut my ff maintenance in half during the winter months.

It is a little more serious than maintenance issues, but thanks anyways. It has been doing this for nearly a year and has steadly gotten worse. Didn't really notice it to someone else drove it that was use to the truck but had not drove it for a while said something.

get hooked up to DDDL to it what codes are logged? or can you cycle the flash codes? I can tell you what the flash codes are. if it is actually derating DDDL will show you the logged derate and why. don't throw parts at it until after you scan it with DDDL.

Have you had your wiring checked for your injectors from the ecm? Bad and long known issue with the 60's. The wiring loom wears holes in the wire's. Causing miss firing as well as codes. Have it checked out.;)

very true, thats why I said gotta pull codes 1st. no question there. in a '98 you have a DDEC IV the 30 pin harness pointing to the front of the truck off the ECM is the sensor harness. the grey and black 5 pin on the front side are the injector/jake harness. the rear of the ECM facing the truck. 30 pin is the vehicle interface harness. the big 5 pin at the top rear is the power harness. the 6 pin in the middle back is the communications harness.

pull back 18" of loom on each harness and inspect for rub throughs. when you pull codes if you have Injector Response Time - Too Long on a cylinder or multiple cylinders. its generally a harness problem, high resistance in the circuit. If you have Injector Response Time - Too Short its generally an injector issue. not harness.


heres the flash code list for the DDEC IV

10 Intermittent Fault
10.1 Intermittent Code or a Symptom and No Codes
10.2 Engine Cranks But Will Not Start
10.3 Erratic Performance and No Codes
10.4 Check Engine Light and Stop Engine Light Fault
10.5 No Data to Diagnostic Data Reader
10.6 Diagnostic Request Switch Inoperative
10.7 Cruise Control Inoperative
10.8 Fan Operational Concern (On/Off Type)
10.9 Fan Operational Concern (Variable Speed Type)
10.10 Engine Brake Inoperative
10.11 Miscellaneous Digital Input Fault
10.12 Miscellaneous Digital Output Fault
10.13 Fire Truck Pressure Governor Fault
10.14 Optimized Idle Feature Does Not Function
10.15 Transmission Interface Fault
10.16 Exhaust Gas Recirculation System (EGR-1) – Fault, Series 50 Engine
10.17 Maintenance Alert System
10.18 Exhaust Gas Recirculation System Basic Checks for Series 60 Engines
11 Flash Code 11 - VSG Low

12 Flash Code 12 - VSG High

13 Flash Code 13 - CLS Voltage Low

14 Flash Code 14 - Temp Sensor High

15 Flash Code 15 - Temp Sensor Low

16 Flash Code 16 - CLS Voltage High

17 Flash Code 17 - Throttle Valve High: Relative Humidity Sensor High

18 Flash Code 18 - Throttle Valve Low; Relative Humidity Sensor Low

21 Flash Code 21 - TPS High

22 Flash Code 22 - TPS Low

23 Flash Code 23 - Fuel Temp Sensor High

24 Flash Code 24 - Fuel Temp Sensor Low

26 Flash Code 26 - Auxiliary Input Active

27 Flash Code 27 - Air Temp Sensor High

28 Flash Code 28 - Air Temp Sensor Low

29 Flash Code 29 – TCI / TCO Temperature Low
29.1 Description of Flash Code 29
29.2 SAE J1587 Equivalent Code for Flash Code 29
29.3 Troubleshooting Flash Code 29
30 Flash Code 30
30.1 Description of Flash Code 30
31 Flash Code 31 - Engine Brake Fault Code or EGR / PWM Fault
31.1 Description of Flash Code 31
31.2 SAE J1587 Equivalent Code for Flash Code
31.3 Troubleshooting Flash Code 31
32 Flash Code 32 - CEL / SEL Fault
32.1 Description of Flash Code 32
32.2 SAE J1587 Equivalent Code for Flash Code 32
32.3 Troubleshooting Flash Code 32
33 Flash Code 33 - TBS High
33.1 Description of Flash Code 33
33.2 SAE J1587 Equivalent Code for Flash Code 33
33.3 Troubleshooting Flash Code 33
34 Flash Code 34 - TBS Low
34.1 Description of Flash Code 34
34.2 SAE J1587 Equivalent Code for Flash Code 34
34.3 Troubleshooting Flash Code 34
35 Flash Code 35 - OPS High
35.1 Description of Flash Code 35
35.2 SAE J1587 Equivalent Code for Flash Code 35
35.3 Troubleshooting Flash Code 35
36 Flash Code 36 - OPS Low
36.1 Description of Flash Code 36
36.2 SAE J1587 Equivalent Code for Flash Code 36
36.3 Troubleshooting Flash Code 36
37 Flash Code 37 - FPS / FRS Voltage High
37.1 Description of Flash Code 37
37.2 SAE J1587 Equivalent Code for Flash Code 37
37.3 Troubleshooting Flash Code 37
38 Flash Code 38 - FPS / FRS Voltage Low
38.1 Description of Flash Code 38
38.2 SAE J1587 Equivalent Code for Flash Code 38
38.3 Troubleshooting Flash Code 38
39 Flash Code 39 – EGR Valve / VNT Vane Fault
39.1 Description of Flash Code 39
39.2 SAE J1587 Equivalent Code for Flash Code 39
39.3 Troubleshooting Flash Code 39
40 Flash Code 40
40.1 Description of Flash Code 40
41 Flash Code 41 - Too Many SRS
41.1 Description of Flash Code 41
41.2 SAE J1587 Equivalent Code for Flash Code 41
41.3 Troubleshooting Flash Code 41
42 Flash Code 42 - Too Few SRS
42.1 Description of Flash Code 42
42.2 SAE J1587 Equivalent Code for Flash Code 42
42.3 Troubleshooting Flash Code 42
43 Flash Code 43 - Coolant Level Low
43.1 Description of Flash Code 43
43.2 SAE J1587 Equivalent Code for Flash Code 43
43.3 Troubleshooting Flash Code 43
44 Flash Code 44 - Temp High
44.1 Description of Flash Code 44
44.2 SAE J1587 Equivalent Code for Flash Code 44
44.3 Troubleshooting Flash Code 44
45 Flash Code 45 - Oil Pressure Low
45.1 Description of Flash Code 45
45.2 SAE J1587 Equivalent Code for Flash Code 45
45.3 Troubleshooting Flash Code 45
46 Flash Code 46 - Battery Voltage Low
46.1 Description of Flash Code 46
46.2 SAE J1587 Equivalent Code for Flash Code 46
46.3 Troubleshooting Flash Code 46
47 Flash Code 47 - Air / Fuel Pressure High
47.1 Description of Flash Code 47
47.2 SAE J1587 Equivalent Code for Flash Code 47
47.3 Troubleshooting Flash Code 47
48 Flash Code 48 - Air / Fuel / EGR Pressure Low or EGR / TCI / TCO Temperature Low
48.1 Description of Flash Code 48
48.2 SAE J1587 Equivalent Code for Flash Code 48
48.3 Troubleshooting Flash Code 48
49 Flash Code 49 – TCO or TCI Temperature High
49.1 Description of Flash Code 49
49.2 SAE J1587 Equivalent Code for Flash Code 49
49.3 Troubleshooting Flash Code 49
50 Flash Code 50
50.1 Description of Flash Code 50
51 Flash Code 51 – TCO or TCI Temperature Circuit Failed High
51.1 Description of Flash Code 51
51.2 SAE J1587 Equivalent Code for Flash Code 51
51.3 Troubleshooting Flash Code 51
52 Flash Code 52 - ECM Fault
52.1 Description of Flash Code 52
52.2 SAE J1587 Equivalent Code for Flash Code 52
52.3 Troubleshooting Flash Code 52
53 Flash Code 53 - ECM Memory Fault
53.1 Description of Flash Code 53
53.2 SAE J1587 Equivalent Code for Flash Code 53
53.3 Troubleshooting Flash Code 53
54 Flash Code 54 - VSS Fault
54.1 Description of Flash Code 54
54.2 SAE J1587 Equivalent Code for Flash Code 54
54.3 Troubleshooting Flash Code 54
55 Flash Code 55 - J1939 Data Link Fault
55.1 Description of Flash Code 55
55.2 SAE J1587 Equivalent Code for Flash Code 55
55.3 Troubleshooting Flash Code 55
56 Flash Code 56 - J1587 Data Link Fault
56.1 Description of Flash Code 56
56.2 SAE J1587 Equivalent Code for Flash Code 56
56.3 Troubleshooting Flash Code 56
57 Flash Code 57 - J1922 Data Link Fault
57.1 Description of Flash Code 57
57.2 SAE J1587 Equivalent Code for Flash Code 57
57.3 Troubleshooting Flash Code 57
58 Flash Code 58
58.1 Description of Flash Code 58
58.2 SAE J1587 Equivalent Code for Flash Code 58
59 Flash Code 59
59.1 Description of Flash Code 59
60 Flash Code 60
60.1 Description of Flash Code 60
61 Flash Code 61 - Injector Response Long
61.1 Description of Flash Code 61
61.2 SAE J1587 Equivalent Code for Flash Code 61
61.3 Troubleshooting Flash Code 61
62 Flash Code 62 - Output Fault
62.1 Description of Flash Code 62
62.2 SAE J1587 Equivalent Code for Flash Code 62
62.3 Troubleshooting Flash Code 62
63 Flash Code 63 - PWM Fault
63.1 Description of Flash Code 63
63.2 SAE J1587 Equivalent Code for Flash Code 63
63.3 Troubleshooting Flash Code 63
64 Flash Code 64 — Turbo Speed Sensor Fault
64.1 Description of Flash Code 64
64.2 SAE J1587 Equivalent Code for Flash Code 64
64.3 Troubleshooting Flash Code 64
65 Flash Code 65 - Throttle Valve Fault, Air Filter Restriction Input Voltage Low
65.1 Description of Flash Code 65
65.2 SAE J1587 Equivalent Code for Flash Code 65
65.3 Troubleshooting Flash Code 65
65.4 Air Filter Restriction Sensor
66 Flash Code 66 - Knock Sensor Fault
66.1 Description of Flash Code 66
66.2 SAE J1587 Equivalent Code for Flash Code 66
66.3 Troubleshooting Flash Code 66
67 Flash Code 67 - Map Sensor Fault
67.1 Description of Flash Code 67
67.2 SAE J1587 Equivalent Code for Flash Code 67
67.3 Troubleshooting Flash Code 67
67.4 Map Input Voltage High
67.5 Map Input Voltage Low
68 Flash Code 68 - Idle Validation Fault
68.1 Description of Flash Code 68
68.2 SAE J1587 Equivalent Code for Flash Code 68
68.3 Troubleshooting Flash Code 68
69 Flash Code 69
69.1 Description of Flash Code 69
70 Flash Code 70
70.1 Description of Flash Code 70
71 Flash Code 71 - Injector Response Short
71.1 Description of Flash Code 71
71.2 SAE J1587 Equivalent Code for Flash Code 71
71.3 Troubleshooting Flash Code 71
72 Flash Code 72 - Vehicle Overspeed
72.1 Description of Flash Code 72
72.2 SAE J1587 Equivalent Code for Flash Code 72
72.3 Troubleshooting Flash Code 72
73 Flash Code 73 — ESS Fault
73.1 Description of Flash Code 73
73.2 SAE J1587 Equivalent Code for Flash Code 73
73.3 Troubleshooting Flash Code 73
74 Flash Code 74 — OI Safety Loop
74.1 Description of Flash Code 74
74.2 SAE J1587 Equivalent Code for Flash Code 74
74.3 Troubleshooting Flash Code 74
75 Flash Code 75 - Battery Volt High
75.1 Description of Flash Code 75
75.2 SAE J1587 Equivalent Code for Flash Code 75
75.3 Troubleshooting Flash Code 75
76 Flash Code 76 - Engine Overspeed / Brake
76.1 Description of Flash Code 76
76.2 SAE J1587 Equivalent Code for Flash Code 76
76.3 Troubleshooting Flash Code 76
77 Flash Code 77 - Exhaust Back Pressure Fault and Several Information Codes
77.1 Description of Flash Code 77
77.2 SAE J1587 Equivalent Code for Flash Code 77
77.3 Troubleshooting Flash Code 77
78 Flash Code 78 — Cruise Control / Adaptive Cruise Control
78.1 Description of Flash Code 78
78.2 SAE J1587 Equivalent Code for Flash Code 78
78.3 Troubleshooting Flash Code 78
79 Flash Code 79
79.1 Description of Flash Code 79
80 Flash Code 80
80.1 Description of Flash Code 80
81 Flash Code 81 – Oil Level, Exhaust Temp, EGR Temp or EGR Delta-Pressure, Circuit Failed High
81.1 Description of Flash Code 81
81.2 SAE J1587 Equivalent Code for Flash Code 81
81.3 Troubleshooting Flash Code 81
81.4 Troubleshoot Maintenance Alert System
81.5 Troubleshoot Exhaust Gas Temperature
82 Flash Code 82 – Oil Level, Exhaust Temp, EGR Temp or EGR Delta-Pressure, Circuit Failed Low
82.1 Description of Flash Code 82
82.2 SAE J1587 Equivalent Code for Flash Code 82
82.3 Troubleshooting Flash Code 82
82.4 Troubleshooting Maintenance Alert System
82.5 Troubleshoot Exhaust Gas Temperature
83 Flash Code 83 – EGR Temp, EGR Delta-Pressure, Exhaust Temp, or External Pump Pressure High

85 Flash Code 85 - Engine Overspeed

86 Flash Code 86 - PGS Sensor High

87 Flash Code 87 - PGS Sensor Low

Hey thanks for the info on the wiring harness. I will look at that when I get a chance. The truck does have a pro driver display in it so it atleast shows some of the problems but I am guessing that it doesn't pick up everything. Is that correct? There isn't any way it will show all the codes is there?

Thank you very much for the help.

No problem..And you are more than welcomed. Thats what we are here for. Skin the harness back and look at your wiring. "CODES" are a general guide line. From DD..We chased our tail on an FL just to find out it was a bad ground on the cab and chassis. It would throw all the "CODES" that were listed above. The factory guide line code's didn't help us at all. After replacing four turbo's(that were out of spec from DD) as well as a complete ECM an engine wiring harness. Series 60's are known for bad injector wiring.

yes you have to know how to interpret codes. thats for sure. series 60 has been my bread and butter for the last 2 years. we don't deal with chassis issues thank god. just engines.

That was the "problem" it would throw code's for a bad turbo and ended up being a bad ground on the chassis wiring..

what other codes did you get along with that? see what I'm saying is a bunch or a few seeming unrelated codes or codes that arise and don't have a problem with the circuit would point me to grounding or harness issues. poor ECM grounding on DDEC will do some goofy things. what code was it anyways? and what DDEC was it? theres harness to the Vpod control then air to the turbo on ddec IV and V and ddec VI has VGT with harness to the actuator on the turbo/

Sorry for getting back to you so late. I've been like a cat in a kids sandbox...Bad chassis ground. It would throw code's for a bad turbo. Now, you are ALLOWED by DD to adjust the rod for the waste gate. Before, if you did it you would void the owners turbo if anything happened down the road. And in our customers case that would be just a matter of a few thousand miles. Per DD you can adjust the waste gate rod if you hook the truck up to DDEC 5. There were NO codes that would that would point a tech to a bad ground on the chassis. DD was stumped and we had to follow warrenty repair because of the year of the truck. It was found just by "LUCK". And DD has changed their trouble shooting of it, only for the law suit that our customer has against FL. And thats all I'm going to say on that subject..

I don't mean to pry by anymeans, I'm just curious about things, that are interesting like that. and i remember how big a deal the actuator replacement/ adjustment feature was when DD introduced it for ddec V. I did an actuator replacement on friday actually.

Your not prying bud. We all learn from each other. Thats what we a SUPPOSE to be here for. I'm a real stickler on the sharing of what one knows. Too many supposed experts out there. Me? I'm as dumb as a fencepost..We went through 12 NEW turbo's in one day. They were all out of DD's feeler gauge specs on the rod stop. AKA over boost. Every one of them were over on the rod travel. LOL, yea. DD will let a tech adjust it now. After our customers law suit is over...The "boys" at the home office are not 100% spot on at all times. And make a bunch more than you and I...

Where is the computer ground at? Does it go through the wiring harness or is it one of the bolts that hold it to the motor?