TM 10-3930-675-20-1 0016 00-9 INPUT AND OUTPUT SIGNALS FOR STEERING ECU (792) TROUBLESHOOTING - CONTINUED 0016 00 Table 13. Error Code 420 - Crab Steering Selection Switch, Circuit Failure Troubleshooting Procedures - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 420 - Crab Steering Selection Switch, Circuit Failure - Continued 5. Check     continuity     between connector  X160  pin  15  and connector X177 pin 15. 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.  If continuity is present, notify SRA. 6. Check     continuity     between connector  X177  pin  15  and steering ECU (792) connector pin 45. 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.  If continuity is present, notify SRA. Table 14. Error Code 422 - Cab in Transport Position Proximity Switch, Circuit Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error  Code  422  -  Cab  in  Transport  Position Proximity Switch, Circuit Failure 1. Check   voltage   at   connector X175 pin 1. Voltage should be 22-26V. If   voltage   is   not   as   specified, check wires at connectors X174, X175,    X195,    and    X197    for damage. Repair or replace connectors (WP 0111 00). 2. Check continuity to chassis at connector X175 pin 3. If continuity is not present, repair or  replace  connectors  (WP  0111 00). 3. Place a piece of metal close to proximity switch 7210. Check voltage at connector X175 pin 2. a.  If    voltage    is    not    present, replace proximity switch (WP 0075 00). b. If  voltage  is  present,  remove metal  piece.  Voltage  should not  be  present.  If  voltage  is present,     replace     proximity switch (WP 0075 00). 4. Check     continuity     between connector   X175   pin   2   and steering ECU (792) connector pin 43. 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.  If continuity is present, notify SRA.