Series 60 DDEC V Troubleshooting – Section 35.3 Troubleshooting Flash Code 31, Sid260, 261, 262, 263, 264, 265/FMI 3, 4

Section 35.3
Troubleshooting Flash Code 31, Sid260, 261, 262, 263, 264, 265/FMI 3, 4

The SAE J1587 equivalent codes for Flash Code 31 are listed in Table "Auxiliary Output Open or Short to Battery" .‪

SAE J1587 Code ‪	Output Number ‪	Fault ‪
s 260 3‪	Auxiliary output 12‪	Short to battery‪
s 260 4‪	Auxiliary output 12‪	Open circuit‪
s 261 3‪	Auxiliary output 13‪	Short to battery‪
s 261 4‪	Auxiliary output 13‪	Open circuit‪
s 262 3‪	Auxiliary output 14‪	Short to battery‪
s 262 4‪	Auxiliary output 14‪	Open circuit‪
s 263 3‪	Auxiliary output 15‪	Short to battery‪
s 263 4‪	Auxiliary output 15‪	Open circuit‪
s 264 3‪	Auxiliary output 16‪	Short to battery‪
s 264 4‪	Auxiliary output 16‪	Open circuit‪
s 265 3‪	Auxiliary output 17‪	Short to battery‪
s 265 4‪	Auxiliary output 17‪	Open circuit‪

The DDEC ECM/ECU supplies a switched ground to the Auxiliary Output circuit to turn ON the function assigned. Flash Code 31 indicates that the function assigned to the Auxiliary Output #12 through #17 circuit has either an open circuit or a short to battery (+). A short to battery (+) is detected when the DDEC ECM/ECU is unsuccessful in turning ON the configured function.‪

Flash Code 31 may also indicate that the function assigned to the Auxiliary Output #12 through #17 circuit is open, shorted to ground. This diagnostic condition is detected when the Auxiliary Output function is OFF and the DDEC ECM/ECU measures a low voltage on the circuit output.‪

Section 35.3.1
Code Check

Perform the following steps to check for codes.‪

1. Turn vehicle ignition ON.
2. Plug in the diagnostic tool.
3. Record codes logged.
4. Clear codes.
5. Start and run the engine for one minute.
   1. If the code becomes active, refer to "35.3.2 Auxiliary Output Cavity Determination and Electrical Check" .
   2. If the code does not become active, go to step 6 .
6. Perform a road test.
   1. If the code returns, refer to "35.3.2 Auxiliary Output Cavity Determination and Electrical Check" .
   2. If the code does not display again, return the vehicle to service or refer to "20.1.1 Diagnosis by Symptom" .

Section 35.3.2
Auxiliary Output Cavity Determination and Electrical Check

Perform the following steps to determine which auxiliary output cavity is associated with the logged codes.‪

1. Determine which auxiliary output cavity is associated with the code or codes being logged. The SAE code descriptions of the flash codes and the DDC wire numbers are listed in Table "Auxiliary Output Cavities" . Continue troubleshooting. Next check connectors, dash light or vehicle power-down relay, or item being driven.

   SAE Code Description - Flash Code‪	Cavity‪
   Auxiliary Output #12‪ (260 3 or 260 4) 31‪	E-46‪
   Auxiliary Output #13‪ (261 3 or 261 4) 31‪	E-47‪
   Auxiliary Output #14‪ (262 3 or 262 4) 31‪	E-50‪
   Auxiliary Output #15‪ (263 3 or 263 4) 31‪	E-51‪
   Auxiliary Output #16‪ (264 3 or 264 4) 31‪	E-52‪
   Auxiliary Output #17‪ (265 3 or 265 4) 31‪	E-53‪

   Table 2. Auxiliary Output Cavities
2. Check the connectors of the output wire associated with the code logged at the Vehicle Interface Harness connector or Engine Harness connector.
3. Check the connectors of the output wire associated with the code logged at the item being driven.
   1. If the connectors are not good, repair or replace the terminals. Refer to "35.3.3.1 Verify Repairs" .
   2. If the connectors are good and the items being driven (e.g. relay, light) are not in good condition, repair or replace the device. (Contact OEM for test procedure.) Refer to "35.3.3.1 Verify Repairs"
   3. If the connectors are good and the items being driven (e.g. relay, light, are in good condition, refer to "35.3.3 Measure Resistance" .

Section 35.3.3
Measure Resistance

Perform the following steps to measure the resistance.‪

1. Turn ignition OFF.
2. Connect the Engine Sensor Harness or Vehicle Interface Harness (connector with output fault).
3. Disconnect the output wire associated with the code logged at the component.
4. Measure the resistance between the removed connector and the ECM/ECU case.
   1. If the reading is less than 100K Ω, contact Detroit Diesel Customer Support Center (313–592–5800).
   2. If the reading is greater than 100K Ω, this wire is shorted to the battery or open. Repair or replace this wire. Refer to "35.3.3.1 Verify Repairs" .

Section 35.3.3.1
Verify Repairs

Perform the following steps to verify repairs.‪

1. Reconnect all connectors.
2. Plug in the diagnostic tool.
3. Clear all codes.
4. Start and run the engine.
   1. If the output code returns, refer to "35.3.1 Code Check" .
   2. If the output code does not return, troubleshooting is complete.