Selecting Test Mode
Five test modes are available for diagnosing anti-lock brake system. Test modes are:
- Mode F0 (Data List) Mode displays actual reading which each wheel speed sensor is sending to EBCM. In this mode, vehicle can be driven and wheel speed information can be observed to determine if readings are comparable to actual vehicle speed. By pressing brake pedal, status of brakelight switch can be observed.
- Mode F1 (Code History) ABS/TCS system has no code history capabilities. If ANTI-LOCK and/or TRACTION OFF indicators are on before entering diagnostics, at least one DTC is current. If ANTI-LOCK and/or TRACTION OFF indicators are not on before entering diagnostics, no DTCs are current. When more than one DTC is stored and ANTI-LOCK and/or TRACTION OFF indicators are on before entering diagnostics, it is impossible to determine between current and history DTCs.
- Mode F2 (Diagnostic Trouble Codes) Mode displays ABS trouble codes. Tech 1 will display any DTCs and brief description of DTC displayed. If no DTC is stored, Tech 1 will display NO ABS CODES. Go to SYMPTOM DIAGNOSIS. Tech 1 will respond to a clear DTCs command by indicating ABS CODES CLEARED or CODE CLEAR FAIL.
- Mode F3 (ABS Snapshot) Mode helps isolate intermittent problems by capturing data before and after fault condition. If MANUAL TRIGGER mode is selected, Tech 1 will wait for ENTER to be pressed before storing speed sensor information. All stored information can be displayed and examined for conditions which might indicate a problem. If AUTOMATIC TRIGGER mode is selected, Tech 1 will capture data which deviates from normal conditions but may not set a DTC, such as driving over bumpy roads or railroad tracks. Condition may be caused by loose connections or intermittent wiring problems. While Tech 1 is waiting for a trigger, ENTER or F9 key may also be used to force a trigger.
- Mode F4 (Misc Test) This mode is used to perform hydraulic modulator functional tests to assist in problem isolation. Tests cannot be performed until all stored DTCs are cleared.
DIAGNOSTIC TROUBLE CODE (DTC)
| DTC | (1) Definition | ||||
|---|---|---|---|---|---|
| 21 | Right Front Wheel Speed Sensor Circuit Open Or Shorted | ||||
| 22 | Right Front Wheel Speed Sensor Signal Erratic | ||||
| 23 | Right Front Wheel Speed Sensor Signal Missing | ||||
| 25 | Left Front Wheel Speed Sensor Circuit Open Or Shorted | ||||
| 26 | Left Front Wheel Speed Sensor Signal Erratic | ||||
| 27 | Left Front Wheel Speed Sensor Signal Missing | ||||
| 31 | Right Rear Wheel Speed Sensor Circuit Open Or Shorted | ||||
| 32 | Right Rear Wheel Speed Sensor Signal Erratic | ||||
| 33 | Right Rear Wheel Speed Sensor Signal Missing | ||||
| 35 | Left Rear Wheel Speed Sensor Circuit Open Or Shorted | ||||
| 36 | Left Rear Wheel Speed Sensor Signal Erratic | ||||
| 37 | Left Rear Wheel Speed Sensor Signal Missing | ||||
| 41 | Right Front Inlet Valve Fault | ||||
| 42 | Right Front Outlet Valve Fault | ||||
| 44 | Left Front Isolation Valve Fault | ||||
| 45 | (2) Left Front Inlet Valve Fault | ||||
| 46 | Left Front Outlet Valve Fault | ||||
| 48 | Right Front Isolation Valve Fault | ||||
| 51 | Right Rear Inlet Valve Fault | ||||
| 52 | Right Rear Outlet Valve Fault | ||||
| 55 | Left Rear Inlet Valve Fault | ||||
| 56 | Left Rear Outlet Valve Fault | ||||
| 61 | Pump Motor Circuit Fault | ||||
| 62 | Low Brake Pedal During An ABS Stop | ||||
| 71 | EBCM/EBTCM Fault | ||||
| 72 | Brake Switch Open Or Shorted | ||||
| 73 | Fluid Level Switch Circuit Open Or Shorted | ||||
| 74 | Pressure Switch Circuit Open Or Shorted | ||||
| 75 | PCM Requested TCS To Be Disabled | ||||
| 76 | UART SDL Circuit Or Signal Fault | ||||
| 77 | Delivered Torque Circuit Open Or Shorted | ||||
|
|||||