03 05-19

1

03 05-19

SUBJECT

DATE

SPN 2000 / FMI 9 - GHG17 - Communication Loss with a Common
Powertrain Controller (CPC) Module (CPC Heartbeat Message is no
Longer Arriving)

March 2019

Additions, Revisions, or Updates
Publication Number / Title
DDC-SVC-MAN-0191

Platform

Section Title

Change

GHG17 DD
Platform

SPN 2000/FMI 9 GHG17 -

New procedures.

DiagnosticLink users: Please update the troubleshooting guides in DiagnosticLink with this newest version. To update the
tool troubleshooting guide, open DiagnosticLink and from the Help – Troubleshooting Guides menu, select the appropriate
troubleshooting manual, then click Update.

All information subject to change without notice.

03 05-19

Copyright © 2019 DETROIT DIESEL CORPORATION

3

2 SPN 2000/FMI 9 - GHG17

2

SPN 2000/FMI 9 - GHG17

Communication loss with a Common Powertrain Controller (CPC) module (CPC heartbeat message is no longer arriving)
Table 1.
SPN 2000/FMI 9
Description

CPC Module has Lost Communication

Monitored Parameter

CAN Communication

Typical Enabling Conditions
Monitor Sequence
Execution Frequency
Typical Duration
Dash Lamps
Engine Reaction

MIL, CEL

Verification

Limp mode, Shut-down condition

Check as follows:
1. Are there any battery voltage faults present (SPN 168/FMI any)?
a. Yes; troubleshoot battery voltage faults first.
b. No; Go to step 2.
2. Have the Aftertreatment Control Module (ACM), Motor Control Module (MCM) or Common Powertrain Controller
(CPC) been recently programmed?
a. Yes; clear the fault codes. If faults do not become active, release the vehicle. If faults become active, Go to step
3.
b. No; Go to step 3.
3. Is the vehicle equipped with a CPC4 or CPC3?
If equipped with a CPC4, Go to step 4.
If equipped with a CPC3, Go to step 6.
4. Disconnect the CPC4 connector #3.
WARNING: ELECTRICAL SHOCK
To avoid injury from electrical shock, follow OEM furnished operating instructions prior to usage.

5. Check the CPC4 internal terminating resistor by measuring and recording the resistance across pins 19 and 21 of the
CPC connector cavity #3, component side. Is the resistance 110 to 130 ohms?

4

All information subject to change without notice.

Copyright © 2019 DETROIT DIESEL CORPORATION

03 05-19

03 05-19

a. Yes, Go to step 8.
b. No, replace the CPC4.
6. Disconnect the CPC3 connector #4.
7. Check the CPC3 internal terminating resistor by measuring and recording the resistance across pins 34 and 35 of the
CPC3 connector cavity #4, component side. Is the resistance 110 to 130 ohms?

8.

9.

10.

11.

a. Yes; Go to step 11.
b. No; replace the CPC3 module.
Disconnect the MCM 21 pin connector and inspect connector for corrosion, oil, fuel or water intrusion. Is
contamination found?
a. Yes, repair as necessary.
b. No, Go to step 9.
Measure and record the resistance between CPC4 connector #3, pin 19 and MCM 21-pin connector pin 19. Is the
resistance less than five ohms?
a. Yes, Go to step 10.
b. No; repair the wire between CPC4 connector #3, pin 19 and MCM 21-pin connector pin 19.
Measure and record the resistance between CPC4 connector #3, pin 21 and MCM 21-pin connector pin 13. Is the
resistance less than five ohms?
a. Yes, Go to step 14.
b. No, repair the wire between CPC4 connector #3, pin 21 and MCM 21-pin connector pin 13.
Disconnect the MCM 21-pin connector and inspect connector for corrosion, oil, fuel or water intrusion. Is
contamination found?
a. Yes; repair as necessary.

All information subject to change without notice.

03 05-19

Copyright © 2019 DETROIT DIESEL CORPORATION

5

2 SPN 2000/FMI 9 - GHG17
b. No; Go to step 12.
12. Measure and record the resistance between CPC3 connector #4, pin 34 and MCM 21-pin connector pin 19. Is the
resistance less than five ohms?
a. Yes; Go to step 13.
b. No; repair the wire between CPC3 connector #4, pin 34 and MCM 21-pin connector pin 19.
13. Measure and record the resistance between CPC3 connector #4, pin 35 and MCM 21-pin connector pin 13. Is the
resistance less than five ohms?
a. Yes; Go to step 14.
b. No; repair the wire between CPC3 connector #4, pin 35 and MCM 21-pin connector pin 13.
14. Turn the ignition ON (key ON, engine OFF).

15. Measure the voltage between MCM 21-pin connector pins 7, 11, 12, 14, and 15 (ignition/battery voltage) and ground.
Is voltage within 1.5 volts of the battery voltage?
a. Yes; Go to step 16.
b. No; repair the circuit in question.
16. Turn the ignition OFF.
17. Measure the resistance between MCM 21-pin connector pins, 5, 6, 8 and 9 of the negative battery post. Is resistance
less than five ohms?
a. Yes; Go to step 18.
b. No; repair the circuit in question.
18. Install a test MCM. Is communication restored (fault inactive)?
a. Yes; replace the MCM.
b. No; replace the CPC.

6

All information subject to change without notice.

Copyright © 2019 DETROIT DIESEL CORPORATION

03 05-19