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117.1 SPN 3659/FMI 14
This diagnosis is typically an open circuit, short to ground or short to power.
117.1.1
Open Circuit, Short to Ground or Short to Power Check
Check as follows:
1. Check for multiple codes.
[a] If fault code 168/1 is active , service 168/1 first. Refer to section 32.2.
[b] If fault 3660/14 and 3661/14 are active in addition to 3659/14, go to step 2.
[c] If only fault code 3659/14 is active, go to step 10.
2. Turn the ignition OFF.
3. Disconnect the Front Injector Harness 12–pin connector.
4. Inspect the Front Injector Harness 12–pin connector for bent or spread pins, inspect the
connector seal for damage (signs of water or oil intrusion).
[a] If the water or oil intrusion, bent or spread pins are found, repair as necessary.
Refer to section 117.1.1.1.
[b] If connector shows no signs of damage, go to step 5.
5. Measure the resistance between pins 9 and 2 on the valve cover side of the Front Injector
Harness. If using J-48671–10, measure between injector #1 pins 3 and 4.
[a] If the resistance is greater than 3 Ω, replace the under valve cover injector harness.
Refer to section 117.1.1.1.
[b] If the resistance is less than 3 Ω, 6.
6. Disconnect the MCM 120–pin connector.
7. Measure the resistance between pin 11of the MCM 120–pin connector and pin 9 of the
Front Injector Harness 12–pin connector.
[a] If the resistance is less than 3 Ω, go to step 8.
[b] If the resistance is greater than 3 Ω, repair the open between pin 11 of the MCM
120–pin connector and pin 9 of the Front Injector Harness 12–pin connector.
Refer to section 117.1.1.1.
8. Disconnect the negative battery cable.
9. Measure the resistance between the positive battery post and pin 11of the MCM 120–pin
connector.
[a] If the resistance is greater than 3 Ω, contact the Detroit Diesel Customer Support
Center at 313–592–5800 for MCM replacement authorization.
All information subject to change without notice.
Copyright © 2007 DETROIT DIESEL CORPORATION
SERIES 60 DDEC VI TROUBLESHOOTING GUIDE
117-3
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Troubleshooting
