TM 10-3930-675-20-1 0031 00-3 BRAKE SYSTEM TROUBLESHOOTING - CONTINUED 0031 00 Table 2. Error Code 119 - Brake System Pressure, Circuit 1 Failure Troubleshooting Procedures - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 119 - Brake System Pressure, Circuit 1 Failure - Continued 9.  Perform voltage checks at the following pins: a. X26 pin 6 b. X18 pin 1 c. brake pressure switch 204- 1 pin 1 d. brake pressure switch 204- 1 pin 4 e. X18 pin 2 f.  X29 pin 5 g. X150 pin 9 h. servo ECU (790) connector 1 pin 40 a.   When voltage is no longer present, inspect wire between pin where voltage stops and previous  pin  and  replace or repair connectors (WP 0111 00). b.   Replace ECU (790) (WP 0079 00). c.   If wiring harness must be replaced, notify SRA. Table 3. Error Code 120 - Brake System Pressure, Circuit 2 Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 120 - Brake System Pressure, Circuit 2 Failure 1.  Check  if  accumulator  evac- uation  valves  are  open  (WP 0164 00). Close   accumulator   evacuation valves. 2.  Check hydraulic accumulator pressure  at  test  point  2  (WP 0186 00). If    pressure    is    not    present, perform troubleshooting procedures “Braking is Poor or Nonexistent” (WP 0006 00). 3.  Remove  cab  circuit  breaker panel  cover  and  ensure  that circuit    breaker    F3    is    not tripped. Reset circuit breaker as required (WP 0073 00). 4.  Remove   panel   in   front   of brake pedals and check brake pressure   switch   204-2   for damage and loose connections. a.  Connect any loose or disconnected connections. b. Replace brake pressure switch if damaged (WP 0097 00). 5.  Check    continuity    between brake  pressure  switch  204-1 pin 1 and pin 4. If continuity is not present when brake pressure is present, replace brake pressure switch (WP 0097 00). EXTRA FUNCT. 7(13) BRAKE CIRCUIT 1 0 BRAKE CIRCUIT 2 0