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28. Check for Temporary DTCs or DTCs with the HDS.
Is DT C P07 20 indicated?
YES
−
Check for poor connections or loose
terminals at the output shaft (countershaft) speed
sensor and the ECM. If the ECM was updated,
substitute a known-good ECM (see page 11-7), then
go to step 27. If the ECM was substituted, go to step
1.
NO
−
Go to step 29.
29. Monitor the OBD STATUS for DTC P0720 in the
DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES
−
If the ECM was updated, troubleshooting is
complete. If the ECM was substituted, replace the
original ECM (see page 11-232). If any other
Temporary DTCs or DTCs were indicated in step 28,
go to the indicated DTC's troubleshooting.
NO
−
If the screen indicates FAILED, check for poor
connections or loose terminals at the output shaft
(countershaft) speed sensor and the ECM. If the
ECM was updated, substitute a known-good ECM
(see page 11-7), then go to step 27. If the ECM was
substituted, go to step 1. If the screen indicates
NOT COMPLETED, go to step 27.
11-153