TM 5-2410-241-23-1
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Table 1. Powertrain Troubleshooting Procedures - Continued.
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MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
621-2 Downshift Switch Data
1. Connect MSD (WP 0016), select
1. If active 621-2 code is present,
Erratic, Intermittent, or
Powertrain D7 ECM, and check for
proceed to step 4.
Incorrect
Diagnostic Codes or Event Codes
2. If active 621-2 code is NOT pres-
ent, proceed to step 2.
2. Push downshift button (Figure 29,
Item 1) for 15 seconds.
3. Check for Diagnostic Codes or
1. If active 621-2 code is present,
Event Codes (WP 0013).
proceed to step 4.
2. If no active codes are present, the
problem does NOT exist at this
time. Resume normal operation.
Figure 29. Downshift Button.
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