Series 50G/60G Troubleshooting – Section 4.3 Knock Intensity

Section 4.3
Knock Intensity

Determine the intensity and frequency of the knock condition as follows:‪

1. Turn on the ignition. Plug the Diagnostic Data Reader (DDR) or theDetroit Diesel Diagnostic Link (DDDL) into the Diagnostic Connector.

   Note: Use the Pro-Link kit to connect the DDR. Use PC card installed in the computer to connect the DDDL.

2. Read active and inactive codes by selecting the DIAGNOSTIC CODE MENU (ACTIVE CODES) on the DDR or DDDL.
3. Determine if the vehicle has Engine Knock Level Above Normal Range (SID 76, FMI 0) or Engine Knock Level Torque Reduction (SID 76, FMI 7).
   1. If the number of "Engine Knock Level Above Normal Range" (SID 76, FMI 0) and "Engine Knock Level Torque Reduction" (SID 76, FMI 7) codes is greater than or equal to four codes per engine operating hour from the first knock code occurrence to the last knock code occurrence, verify the knock condition is real. Refer to "4.4 Verification of Engine Knock" .
   2. If the number of "Engine Knock Level Above Normal Range" (SID 76, FMI 0) and "Engine Knock Level Torque Reduction" (SID 76, FMI 7) codes is less than four codes per engine operating hour from the first knock code occurrence to the last knock code occurrence, then clear the codes, put the vehicle back in service, check vehicle again in 24 hours, refer to step and step .
4. If the engine no longer knocks, troubleshooting is done.