Series 50G/60G Troubleshooting – Section 4.14 Fake Knock Codes

Section 4.14
Fake Knock Codes

Check for poor grounds causing Fake Knock Codes as follows: ‪

1. Confirm the Starter to Block ground is a No. 00 cable.
   1. If cable wire gage is too small, replace with a larger gage cable.
   2. If cable wire gage is suitable, go to step 2 .
2. Confirm the Starter to Frame ground is a No. 00 cable.
   1. If cable wire gage is too small, replace with a larger gage cable.
   2. If cable wire gage is suitable, go to step 3 .
3. Check the Starter to Block, Starter to Frame, and SNEF module ground (wire No. 954, black) to block ground wires as follows:
   1. Using a digital volt-ohmmeter, measure resistance in each cable. If the resistance is greater than 50 mΩ, replace the ground wire.
   2. Examine the points for each cable. If the points have rust, paint and corrosion, clean the points and reconnect.
   3. If all the resistances are less than 50 mΩ and the connections are clean, go to step 4 .
4. Confirm the ground surfaces are properly connected to the vehicle ground. Repair any bad ground connection and continue.
5. If the Fake Knock Code problem continues, contact DDC technical service.
6. If there are no longer Knock Codes, troubleshooting is done.