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Anti-Squat Control Stops Operating

  1. Check service data on Throttle Position Sensor (TPS). See SERVICE DATA INSPECTION  under TESTING & DIAGNOSIS. If TPS service data tests satisfactorily, go to next step. If TPS service data does not test satisfactorily, go to step 7).
  2. Select TOUR mode using ECS switch. Using Multi-Use Tester (MUT), enter a simulated vehicle speed of 19 MPH. Refer to MUT instructions for specific procedure. Using MUT, ensure service data indication for items No. 61, 62, 63 and 64 is SOFT.
  3. While monitoring service data indication for item No. 61, quickly depress accelerator pedal. Service data indication should change to HARD for a second and then change to MEDIUM. Release accelerator pedal. Service data indication should change to SOFT.
  4. Increase simulated speed from MUT to 37 MPH. Quickly depress accelerator pedal again. Service data indication should change to MEDIUM. Release accelerator pedal. Service data indication should change to SOFT.
  5. Increase simulated speed from MUT to 56 MPH. Quickly depress accelerator pedal again. Service data indication should remain at SOFT for a second and then change to MEDIUM. Release accelerator pedal. Service data indication should change to SOFT.
  6. Repeat steps 3)-5) for MUT items No. 62, 63 and 64. If any service data items do not test as specified, replace ECS control unit. If all service data items test as specified, anti-squat control is functioning properly.
  7. Start engine. If CHECK ENGINE light comes on and stays on, go to step 9). If CHECK ENGINE LIGHT does not stay on, check continuity between TPS harness connector terminal No. 2 (Brown/Red wire) and ECS control unit harness connector terminal No. 59 (Brown/Red wire). See Figure.
  8. If continuity is not present, repair harness. If continuity is present, test TPS. See THROTTLE POSITION SENSOR  under COMPONENT TESTING. If TPS is okay, replace ECS control unit. If TPS is faulty, replace TPS.
  9. Disconnect TPS harness connector. Turn ignition on. Measure voltage between ground and TPS harness connector terminal No. 1 (Green/Yellow wire). If 5 volts are present, go to next step. If 5 volts are not present, check Green/Yellow wire between TPS connector terminal No. 1 and engine control unit connector terminal No. 61. Repair as necessary. If wire is okay, replace engine control unit.
  10. Using an ohmmeter, check continuity between TPS harness connector terminal No. 4 (Black wire) and ground. If continuity is present, replace TPS. If continuity is not present, check Black wire between TPS connector terminal No. 4 and engine control unit connector terminal No. 72. Repair as necessary. If wire is okay, replace engine control unit.
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