a. Yes; Go to step 14.
b. No; repair the engine side harness. Verify repairs.
NOTE: The use of extension harness J49120 will ease installation of test MCM.
14. Install a test MCM.
15. Reconnect all connections and start engine. Bring to operating temperature of 71°C (160°F). Road test the vehicle for
30 minutes. Does fault become active?
a. Yes; repeat all steps. If results are the same, retain a log file of active fault and the measured resistance values
recorded in this procedure and contact the Customer Support Center at 800-445-1980 for further instructions.
b. No; Go to step 16.
16. Install original MCM. Bring to operating temperature of 71°C (160°F). Road test the vehicle for 30 minutes. Does fault
become active?
a. Yes; retain log file of active fault. Replace the MCM. Refer to section "Removal of the Motor Control Module".
b. No; release vehicle.

All information subject to change without notice.

12 07-15

Copyright © 2016 DETROIT DIESEL CORPORATION

23

6 SPN 655/FMI 6 - EPA10 - GHG14

6

SPN 655/FMI 6 - EPA10 - GHG14

Injector Cylinder #5 Needle Control Valve Shorted Circuit
Table 21.
SPN 655/FMI 6
Description

Injector Cylinder #5 Needle Control Valve Shorted Circuit

Monitored Parameter

Injector Cylinder #5 Needle Control Valve

Typical Enabling Conditions

Engine rpm = idle or higher

Monitor Sequence

None

Execution Frequency

Continuous when enabling conditions met

Typical Duration

Two Seconds

Dash Lamps

MIL, CEL

Engine Reaction

Derate 25%

Verification

Engine Idle (one minute)

Check as follows:
NOTE: Submit completed diagnostics with warranty claim.
NOTE: Injector chart PDF available on DDCSN/SUPPORT/SPECIALIZED SERVICE.
1. Check for multiple codes. Using DiagnosticLink ®, retain log file of active fault and clear codes (code active for one
key cycle).
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a. If SPN fault code 168 or 723/FMI any is present, service those faults first.
b. If SPN fault code 168 or 723/FMI any is NOT present, Go to step 2.
2. Check the warranty claim history. Check with driver. Is this the first occurrence of this fault within the last 30 days?
a. Yes; Go to step 3.
b. No; complete diagnostics, retain a log file of active fault and the measured resistance values recorded in this
procedure and contact the Customer Support Center at 800-445-1980.
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.
3.
4.
5.
6.

Start and warm the engine until the coolant temperature is above 71°C (160°F).
Turn the engine OFF.
Disconnect the rear rocker cover 14-pin injector harness connector.
Inspect the rear fuel injector harness 14-pin injector connectors for bent or spread pins; inspect the connector seal for
damage (signs of water or oil intrusion).
a. If water or oil intrusion, bent or spread pins are found, repair as necessary.
b. If the connector shows no signs of damage, Go to step 7.

NOTE: DO NOT touch the metal ohmmeter leads with your hands when the measurements are made.
7. Using the appropriate chart below, measure and record the resistance values between the corresponding pins on the
valve cover side of the rear fuel injector harness listed below. Are the resistances within range?

All information subject to change without notice.

12 07-15

Copyright © 2016 DETROIT DIESEL CORPORATION

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6 SPN 655/FMI 6 - EPA10 - GHG14

Table 22.
Rear Fuel Injector Harness 14-Pin Connector Resistance Chart (Valve Cover Side)

Injector #4
Needle

Pins 1 and 2

Pins 1 and 8

Pin 2 and
ground

Pin 8 and
ground

1.3 to 2.5Ω*

Greater than
100kΩ*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Injector #5
Needle

Ω

Pins 1 and 3

Pins 1 and 9

1.3 to 2.5Ω*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Injector #6
Needle

Ω
Pin 3 and
ground

Ω

Ω
Pin 9 and
ground
Greater than
100kΩ*

Ω

Ω

Pins 1 and 4

Pins 1 and 12

Pin 4 and
ground

Pin 12 and
ground

1.3 to 2.5Ω*

Greater than
100kΩ*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Ω

Ω

Ω

* = acceptable resistance

Table 23.
Rear Fuel Injector Harness 14-Pin Connector Resistance Chart (Using J-48671-10 Injector Breakout Box)
Note: Ensure J-48671-10 ground strap is connected to cylinder head.

Injector #4
Needle

Pins 3 and 4

Pins 2 and 3

Pin 2 and ground

Pin 3 and
ground

1.3 to 2.5Ω*

Greater than
100kΩ*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Injector #5
Needle

Ω

Ω

Pins 3 and 4

Pins 2 and 3

Pin 2 and ground

Pin 3 and
ground

1.3 to 2.5Ω*

Greater than
100kΩ*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Injector #6
Needle

Ω

Ω

Ω

Ω

Pins 3 and 4

Pins 2 and 3

Pin 2 and ground

Pin 3 and
ground

1.3 to 2.5Ω*

Greater than
100kΩ*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Ω

Ω

Ω

* = acceptable resistance

a. Yes; Go to step 11.
b. No; Go to step 8.
8. Remove the rocker cover. Refer to section "Removal of the Rocker Cover".
9. Remove the rear fuel injector harness from the engine.
Refer to section "Removal of the Two-Piece Fuel Injector Wiring Harness - Three-Filter System".
Refer to section "Removal of the Two-Piece Fuel Injector Wiring Harness - Two-Filter System".
NOTE: DO NOT touch the metal ohmmeter leads with your hands when the measurements are made.
10. Using the chart below, measure and record the resistance values between the injector pins listed below. Are the
resistances within range?

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All information subject to change without notice.

Copyright © 2016 DETROIT DIESEL CORPORATION 12 07-15

12 07-15

Table 24.
Injector Needle Resistance Chart (Injector Harness must be removed from engine)

Injector #4
Needle

Pins 3 and 4

Pins 2 and 3

Pin 2 and ground

Pin 3 and
ground

2.0Ω or less*

Greater than
100kΩ*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Injector #5
Needle

Ω

Ω

Pins 2 and 3

Pin 2 and ground

Pin 3 and
ground

2.0Ω or less*

Greater than
100kΩ*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Injector #6
Needle

Ω

Pins 3 and 4

Ω

Ω

Ω

Pins 3 and 4

Pins 2 and 3

Pin 2 and ground

Pin 3 and
ground

2.0Ω or less*

Greater than
100kΩ*

Greater than
100kΩ*

Greater than
100kΩ*

Ω

Ω

Ω

Ω

* = acceptable resistance

a. Yes; replace the rear fuel injector harness.
Refer to section "Removal of the Two-Piece Fuel Injector Wiring Harness - Three-Filter System".
Refer to section "Removal of the Two-Piece Fuel Injector Wiring Harness - Two-Filter System".
b. No; replace the injector with the out-of-range resistance.
Refer to section "Removal of the Fuel Injector - Three-Filter System".
Refer to section "Removal of the Fuel Injector - Two-Filter System".
11. Disconnect the Motor Control Module (MCM) 120-pin connector.
12. Inspect the MCM 120-pin connector and 120-pin harness connector for signs of corrosion, spread, unseated (pushed
out) or damaged pins, connector seal for damage (signs of water or oil intrusion) or signs of wire damage.
a. If signs of damage are found, repair as necessary. Verify repairs.
b. If no signs of damage, Go to step 13.

All information subject to change without notice.

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6 SPN 655/FMI 6 - EPA10 - GHG14

NOTE: DO NOT touch the metal ohmmeter leads with your hands when the measurements are made.
13. Using the chart below, measure and record the resistance values between the engine side of the rear valve cover 14-pin
connector and the MCM 120-pin connector. Are the resistances within range?
Table 25.
Engine Harness Injector Circuit Resistance Table
Rear Engine Side Valve
Cover 14-pin connector
#

MCM 120-Pin Harness
Connector

Rear Engine Side Valve
Acceptable Resistance
Acceptable Resistance
Cover 14 pin connector
1Ω or less
1KΩ or greater
#

1

19

Ω

1 and ground

Ω

2

16

Ω

2 and ground

Ω

3

20

Ω

3 and ground

Ω

4

18

Ω

4 and ground

Ω

a. Yes; Go to step 14.
b. No; repair the engine side harness.
NOTE: The use of extension harness J-49120 will ease installation of test MCM.
14. Install a test MCM.
15. Reconnect all connections and start engine. Bring to operating temperature of 71°C (160°F). Road test the vehicle for
30 minutes. Does fault become active?
a. Yes; repeat all steps. If results are the same, retain a log file of active fault and the measured resistance values
recorded in this procedure and contact the Customer Support Center at 800-445-1980 for further instructions.
b. No; Go to step 16.
16. Install original MCM. Bring to operating temperature of 71°C (160°F). Road test the vehicle for 30 minutes. Does fault
become active?
a. Yes; retain log file of active fault. Replace the MCM. Refer to section "Removal of the Motor Control Module".