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 |  |  | and pin 4 is between 200 to 400 ohms.  |
 |  |  | NOTE: A transient suppression diode may cause low |____
 |  |  | resistance if the measurement polarity is  |
 |  |  | reversed.  |
 |  |  |  |
 |  |  | 4. Inspect electrical connectors for bent or broken  |
 |  |  | pins, contamination, or damage.  |
 |  |  | 5. If the problem is not corrected, replace the P5-3  |
 |  |  | Flight Control Module.  |
 |  |  | 6. Supply hydraulic power (AMM 29-15-00/201).  |
 |  |  | 7. Do the Yaw Damper Coupler - Adjustment/Test  |
 |  |  | (AMM 22-12-32/501).  |
 |  |  | 8. If the problem is not corrected, replace the Yaw  |
 |  |  | Damper Coupler (AMM 22-12-31/401).  |

 ................................................................................. | YDC YD | msg. no. | Possible Causes: | | fault | 22-21001 | 1. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Supply hydraulic power (AMM 29-15-00/201). | | | | 2. Do the Yaw Damper Coupler - Adjustment/Test | | | | (AMM 22-12-32/501). | | | | 3. If the problem is not corrected, replace the | | | | Yaw Damper Coupler (AMM 22-12-31/401). | ................................................................................. | YDC PR | msg. no. | Possible Causes: | | fault | 22-21002 | 1. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Do the Yaw Damper Coupler - Adjustment/Test | | | | (AMM 22-12-32/501). | | | | 2. If the problem is not corrected, replace the | | | | Yaw Damper Coupler (AMM 22-12-31/401). |
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú

 22-12-01
 YAW DAMPER COUPLER  ú ú 02 Page 107 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~............................................................................... | FAULT MESSAGE/CORRECTIVE ACTION (TABLE 101) | ................................................................................. | YDC Fault | YDC Fault | Corrective Action | | Message | Detail 1 | | .................................................................................
 | YD sol  | msg. no.  | Possible Causes:  |
 | fault  | 22-21003  | 1. Yaw Damper Engage Solenoid  |
 |  |  | 2. Yaw Damper Coupler  |
 |  |  |  |
 |  |  | Corrective Action:  |
 |  |  | 1. Make sure that the resistance from D295 pin 20 to  |
 |  |  |  ground is between 50 to 80 ohms.  |
 |  |  | 2. Do a wiring check between D295 pin 20 and D291  |
 |  |  |  pin 1 at the Yaw Damper Engage Solenoid.  |
 |  |  | 3. Do a wiring check to ground from D291 pin 2 at the |
 |  |  |  Yaw Damper Engage Solenoid.  |
 |  |  | 4. Inspect electrical connectors for bent or broken  |
 |  |  |  pins, contamination, or damage.  |
 |  |  | 5. If the problem is not corrected, replace the Yaw  |
 |  |  |  Damper Engage Solenoid (AMM 22-12-21/401).  |
 |  |  | 6. If the problem is not corrected, replace the Yaw  |
 |  |  |  Damper Coupler (AMM 22-12-31/401).  |

 ................................................................................. | PR sol | msg. no. | Possible Causes: | | fault | 22-21004 | 1. Pressure Reducer Bypass Valve | | | | 2. Yaw Damper Coupler | | | | | | | | Corrective Action: | | | | 1. Make sure that the resistance from D295 pin 31 | | | | to ground is between 50 to 80 ohms. | | | | 2. Do a wiring check between D295 pin 31 and D7377 | | | | pin 1 at the Pressure Reducer Bypass Valve | | | | solenoid. | | | | 3. Do a wiring check to ground from D7377 pin 2 at | | | | the Pressure Reducer Bypass Valve solenoid. | | | | 4. Inspect electrical connectors for bent or broken | | | | pins, contamination, or damage. | | | | 5. If the problem is not corrected, replace the | | | | Pressure Reducer Bypass Valve (AMM 27-21-96/401). | | | | 6. If the problem is not corrected, replace the Yaw | | | | Damper Coupler (AMM 22-12-31/401). |
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH 10-62253 ú
　
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