TM 10-3930-675-20-1 0029 00-3 MISCELLANEOUS TRANSMISSION FAILURE TROUBLESHOOTING - CONTINUED 0029 00 Table 2. Error Code 622 - Feedback Signal From 2WD/4WD Switch Not Correct Troubleshooting Procedures - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 622 - Feedback Signal From 2WD/ 4WD Switch Not Correct - Continued 4.  Disconnect ECU (793) connector and connector 7207   located   at   sensor   on bottom of transmission. 5.  Check  voltage  at  connector 7207 pin 1. Voltage should be 22-26V. a.  If voltage is not as specified, repair  or  replace  connectors (WP 0111 00). b. If    wiring    harness    requires replacement, notify SRA. 6.  Check    continuity    between connector   7207   pin   2   and ECU connector pin 29. Check continuity to chassis. a.  If   continuity   between   pins, repair  or  replace  connectors (WP 0111 00). b. If continuity (short) to chassis,    repair    or    replace connectors (WP 0111 00). c.  Replace   sensor   7207   (WP 0095 00). Table 3. Error Code 746 - Backup Alarm Control Circuit, Short Circuit Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 746 - Backup Alarm Control Circuit, Short Circuit Failure 1.  Place    gear    selector    in    N (Neutral)   position   (TM   10- 3930-675-10). 2.  Ensure    that    backup    alarm circuit breaker number 10 is not tripped. Reset circuit breaker as required (WP 0073 00). 3.  Remove cab transmission and steering ECU panel cover and disconnect transmission ECU (793)   connector   (WP   0079 00). 4.  Check voltage at transmission ECU (793) connector pin 7. a.  If 22-26V are present, replace reversing   light   relay   (305) (WP 0073 00). b. If    0V    is    present,    replace transmission ECU (793) (WP 0079 00).