EPS CONTROL UNIT'S SELF-DIAGNOSTIC FUNCTION The EPS control unit is equipped with a self-diagnostic function. If this function detects a malfunc- tion in the EPS system, it lights the EPS warning display to alert the rider that a malfunction has ‘occurred in the system. Once a malfunction has been detected, it becomes stored in the EPS con- trol unit memory in the form of a fault code. «The EPS warning display comes on when the main switch is turned to “ON’, and then goes off once the engine is started. If the warning light remains on or comes on after the engine is started, the EPS system may be defective. +The electrical circuit of the warning display can be checked by turning the main switch to “ON’. If the warning display does not come on, the electrical circuit may be defective, (DEPS warning display TIP + If the engine is stopped using the engine stop switch and the main switch is in the “ON” position, the EPS warning display comes on to indicate that the power assistance for the steering is not functioning, «If the steering usage is too heavy (i.e, excessive steering use when the snowmobile is traveling at a slow speed), the power assist is reduced to protect the EPS motor from overheating, 2.282011 Apex and New Model Technical Orientation Guide EPS WARNING DISPLAY DURING NORMAL OPERATION The EPS warning display comes on initially for 2 seconds after the main switch is turned to “ON”. However, the warning display remains on until the engine is started. In addition, if a malfunction is detected while the warning light comes on initially, the warning light remains on. Furthermore, the warning display comes on whenever a malfunction has occurred. TIP. ‘The EPS system does not operate while the EPS warning display is on. Main switch EPS warning display (no malfunction detected) EPS warning display (malfunction detected) OFF ON 2-29 ‘Comes on, - Initial lighting: 2 seconds Goes off (however, the warning display remains (on until the engine is started).DIAGNOSTIC MODE Setting the diagnostic mode (present and past malfunctions) 1, Turn the main switch to “ON”. 2. Disconnect the EPS self-diagnosis signal connector (7). Te Do not disconnect the EPS self-diagnosis sig nal connector before turning the main switch to “ON 3. Select the signaling mode by grounding the EPS self-diagnosis signal connector (male side) to the EPS control unit @) or discon- necting it from the unit as follows. a) Present malfunction signaling mode Ground the EPS self-diagnosis signal connector within 5 seconds after turning the main switch to “ON’, and leave it grounded. The signaling mode is acti- vated after 5 seconds. b) Past malfunction signaling mode While the present malfunction mode is activated, briefly disconnect the EPS self-diagnosis signal connector, ground it again, and leave it grounded. The sig- naling mode is activated after 5 sec- onds. 4. Turn the main switch to “OFF” to cancel the diagnostic mode. Tip +The diagnostic mode can also be canceled by riding the snowmobile at speeds above 2 km/h, *When the diagnostic mode is selected and during the initial lighting of the EPS warning display, the EPS control unit does not receive input from the EPS self-diagnosis signal con- nector. 2-302011 Apex and New Model Technical Orientation Guide Identifying fault codes ‘When the diagnostic mode is activated, the fault codes determined by the fail-safe specifications are signaled by the EPS warning display as follows. + Present malfunction signaling mode: Currently detected fault codes are signaled. * Past malfunction signaling mode: Both previously detected fault codes and currently detected fault codes are signaled jgnaling method Example 1: Fault code No. 23 2 4 FULIUL_SUL_IU. - oF HPA TPYELL Ro 4284 05x38 05x5 a. EPS sell-diagnosis signal connector 9. Grounded b. Diagnostic mode h. Normal mode (diagnostic mode not activated) c. EPS warning display i. Mode selection judgment d, Disconnected |. Present malfunction signaling mode e. On k. Past malfunction signaling mode 1. Off "1 The EPS warning display comes on for 5 seconds during the diagnostic mode selection judgment. *2 Display of the present malfunctions stops when the past malfunction display mode is selected. ‘After the mode selection judgment is completed (present or past malfunction mode), the current fauit code signaling stops immediately, and then the first code of the mode is signaled 2 seconds later. ‘When a fault code is signaled, the EPS warning display goes off for 1 second between the units of 10 and the units of 1 for the code, After a fault code is signaled, the warning light goes off for 3 sec onds, and then the next code is signaled. Example 2: No malfunctions are detected ale be 5 |15)1.511.511.5)1.511.511.511.5) 9 a EPS self-diagnosis signal connector ©. Goes off. b. EPS warning display f. Grounded c. Disconnected 4g. Mode selection judgment 4. Comes on “1 The EPS warning display comes on for 5 seconds during the diagnostic mode selection judgment. Aiter the mode selection judgment is completed (present display or past malfunction mode), the current fault code signaling stops immediately, and then the EPS warning display starts flashing at 1.5-second intervals. 231Deleting fault codes To delete fault codes, ground the EPS self-diagnosis signal connector 3 or more times within 5 sec- onds while the present or past malfunction mode is activated. The currently selected mode remains active after the fault codes of that mode are deleted. TTT 2 a. EPS selt-diagnosis signal connector ©. Grounded b. Disconnected T1: Connector grounded - -- - 0.1 Replace, TP. ‘The pocket tester and the analog pocket tester readings are shown in the following table. Continuity - Positive tester probe — red (7) Negative tester probe > black @ No continuity Positive tester probe -» red (?) Negative tester probe -> EPS motor body 3) No continuity Positive tester probe > black (2) Negative tester probe > EPS motor body 3) a. Connect the pocket tester (9 x 1) to the EPS motor coupler terminal and EPS motor body. Analog pocket tester: YU-03112-C Pocket tester: 90890-03112 b. Check the EPS motor for continuity. &. Check the EPS motor for no continuity. IVOUUUUUNUVUUUUUOVUUVUUTOVUUCS EPS TORQUE SENSOR INSPECTION 1. Remove: + EPS unit 2. Check: + EPS torque sensor resistance Out of specification +> Replace. EPS torque sensor resistance 1.00 ~ 1.50 k. 2:382011 Apex and New Model Technical Orientation Gi a. Connect the pocket tester (© x 1k) to the EPS torque sensor coupler terminal as shown, Analog pocket tester: Yu-03112-C Pocket tester: 90890-03112 2.39 Positive tester probe —> red Negative tester probe -» black 2 b. Measure the EPS torque sensor resistance. AAAAAAAAAAAAAA AAA A AAA AAA AAA