41 FLASH CODE 41 - TOO MANY SRS

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1 41 FLASH CODE 41 - TOO MANY SRS Section Page 41.1 DESCRIPTION OF FLASH CODE SAE J1587 EQUIVALENT CODE FOR FLASH CODE TROUBLESHOOTING FLASH CODE

3 SINGLE DDEC TROUBLESHOOTING MANUAL 41.1 DESCRIPTION OF FLASH CODE 41 Flash Code 41 indicates that the ECM has detected extra Synchronous Reference Sensor pulses, or the ECM has detected missing Timing Reference Sensor pulses, see Figure Figure 41-1 Synchronous Reference Sensor and Timing Reference Sensor 41.2 SAE J1587 EQUIVALENT CODE FOR FLASH CODE 41 The SAE J1587 equivalent code for Flash Code 41 is 021/0. 6SE Copyright 2004 DETROIT DIESEL CORPORATION From Bulletin 2-SECM

4 41.3 TROUBLESHOOTING FLASH CODE TROUBLESHOOTING FLASH CODE 41 The following procedure will troubleshoot Flash Code Check for Signal Open Perform the following steps to check for signal open. 1. Turn ignition OFF. 2. Disconnect engine harness connector at the ECM. See Figure Figure 41-2 Engine Harness Connector 3. Read resistance between sockets T1 and T2 on the engine harness connector. [a] If the resistance reading is less than or equal to 135, refer to section [b] If the resistance reading is greater than 136 or open, refer to section From Bulletin 2-SECM-04 6SE Copyright 2004 DETROIT DIESEL CORPORATION

5 SINGLE DDEC TROUBLESHOOTING MANUAL Check for Short Perform the following steps to check for a short. 1. Disconnect the TRS connector. 2. Measure resistance between sockets T1 and T2 on the engine harness connector. See Figure Figure 41-3 Engine Harness Connector to Timing Reference Sensor 3. Measure resistance between socket T1 and ground and between socket T2 and ground. [a] If the resistance measurement is greater than 10,000 or open, refer to section [b] If the resistance measurement is less than or equal to 10,000, a short exists between #110 and #109 or where resistance reads less than 10,000.Repairthe short. Refer to section SE Copyright 2004 DETROIT DIESEL CORPORATION From Bulletin 2-SECM

6 41.3 TROUBLESHOOTING FLASH CODE Open Timing Reference Sensor Line Check Perform the following steps to check the open TRS line. 1. Disconnect the TRS connector. 2. Install a jumper wire between sockets A and B of the TRS harness connector. 3. Measure resistance between sockets T1 and T2 on the engine harness connector. [a] If the resistance measurement is less than or equal to 5, refer to section [b] If the resistance measurement is greater than 5 or open, the signal line #110 or return line #109 is open. Repair the break. Refer to section Check Timing Reference Sensor Resistance Perform the following steps to check TRS resistance. 1. Measure resistance of TRS across sensor connector pins A and B. See Figure Figure 41-4 Engine Harness Connector to Timing Reference Sensor [a] If the resistance measurement is greater than 136, refer to section [b] If the resistance measurement is less than 100, refer to section [c] If the resistance measurement is between 100 and 135, refer to section From Bulletin 2-SECM-04 6SE Copyright 2004 DETROIT DIESEL CORPORATION

7 SINGLE DDEC TROUBLESHOOTING MANUAL Check Timing Reference Sensor Gap Perform the following steps to check the TRS gap. 1. Bar the engine until the TRS is over a TRS tooth of the pulse wheel. 2. Check the gap between TRS and the tooth of the pulse wheel (0.020 to in.). A depth micrometer can be used. [a] If the gap setting is correct, refer to section [b] If the gap setting is not correct, adjust the TRS until the gap setting is correct. If the problem returns, the pulse wheel may be loose, bad, or damaged. Refer to section Synchronous Reference Sensor Code Check Perform the following steps to check for SRS code. 1. Check for SRS code. [a] If code 21/1 is not logged, refer to section [b] If code 21/1 is logged, refer to section Check ECM Connectors Perform the following steps to check the ECM connectors. 1. Check terminals at the ECM engine harness connectors (both the ECM and harness side) for damage: bent, corroded, and unseated pins or sockets. [a] If terminals and connectors are damaged, repair them. Refer to section [b] If terminals and connectors are not damaged, install a test ECM. Refer to section SE Copyright 2004 DETROIT DIESEL CORPORATION From Bulletin 2-SECM

8 41.3 TROUBLESHOOTING FLASH CODE Synchronous Reference Sensor Resistance Check Perform the following steps to check SRS resistance. 1. Measure resistance between sockets S1 and S2 on the engine harness connector. See Figure Figure 41-5 Engine Harness Connector to Synchronous Reference Sensor [a] If measured resistance is greater than 136 or open, refer to section [b] If measured resistance is less than 135, refer to section From Bulletin 2-SECM-04 6SE Copyright 2004 DETROIT DIESEL CORPORATION

9 SINGLE DDEC TROUBLESHOOTING MANUAL Check for Short Perform the following steps to check for a short. 1. Disconnect the SRS connector. 2. Measure resistance between sockets S1 and S2 on the engine harness connector. [a] If measured resistance is greater than 10,000 or open, refer to section [b] If measured resistance is less than or equal to 10,000, the signal line #111 is shorted to the return line #112. Repair the short. Refer to section Open Synchronous Reference Sensor Line Check Perform the following steps to check for an open SRS line. 1. Disconnect the SRS connector. 2. Install a jumper wire between sockets A and B of the SRS harness connectors. 3. Measure resistance between sockets S1 and S2 on the engine harness connector. [a] If measured resistance is less than or equal to 5, refer to section [b] If measured resistance is greater than 5 or open, the signal line #111 or return line #112 is open. Repair the break and refer to section Synchronous Reference Sensor Test Perform the following steps to test the SRS. 1. Measure resistance of SRS across the sensor connector pins A and B. [a] If measured resistance is less than or equal to 100, refer to section [b] If measured resistance is greater than 136, refer to section [c] If measured resistance is between 100 and 135, refer to section SE Copyright 2004 DETROIT DIESEL CORPORATION From Bulletin 2-SECM

10 41.3 TROUBLESHOOTING FLASH CODE Check Timing Reference Sensor Connectors Perform the following steps to check TRS connectors. 1. Check terminals at the TRS (both the TRS and harness side) for damage: bent, corroded, and unseated pins or sockets. See Figure Figure 41-6 Engine Harness Connector to Timing Reference Sensor [a] If terminals and connectors are damaged, repair them. Refer to section [b] If terminals and connectors are not damaged, replace the TRS. Refer to section Check Synchronous Reference Sensor Connectors Perform the following steps to check the SRS connectors. 1. Check terminals at the SRS (both the SRS and harness side) for damage: bent, corroded, and unseated pins or sockets, or bad contacts. [a] If terminals and connectors are damaged, repair them. Refer to section [b] If terminals and connectors are not damaged, replace the SRS. Refer to section From Bulletin 2-SECM-04 6SE Copyright 2004 DETROIT DIESEL CORPORATION

11 SINGLE DDEC TROUBLESHOOTING MANUAL Verify Synchronous Reference Sensor / Timing Reference Sensor Perform the following steps to verify operation of the SRS/TRS. 1. Reconnect all connectors. 2. Turn vehicle ignition ON. 3. Clear codes. 4. Start and run the engine for one minute. 5. Stop engine. 6. Check DDR for codes. [a] If no codes are logged, troubleshooting is complete. [b] If code 21/0 and any other codes are logged and the SRS was not replaced, refer to section [c] If any codes except code 21/0 are logged, refer to section Verify Repairs Perform the following steps to verify repairs. 1. Turn vehicle ignition OFF. 2. Reconnect all connectors. 3. Turn vehicle ignition ON. 4. Clear codes. 5. Start and run the engine for one minute. 6. Stop engine. 7. Check DDR for codes. [a] If no codes are logged, troubleshooting is complete. [b] If code 21/0 and any other codes are logged, all system diagnostics are complete. Review this section to find the error. Refer to section or contact Detroit Diesel Technical Service. [c] If any codes except code 21/0 are logged, refer to section SE Copyright 2004 DETROIT DIESEL CORPORATION From Bulletin 2-SECM

34 FLASH CODE 34 - TBS LOW

34 FLASH CODE 34 - TBS LOW Section Page 34.1 DESCRIPTION OF FLASH CODE 34... 34-3 34.2 SAE J1587 EQUIVALENT CODE FOR FLASH CODE 34... 34-3 34.3 TROUBLESHOOTING FLASH CODE 34... 34-4 Figure 34-1 Turbo Boost