Power Steering System - Except Electric Vehicle: Overview — Power Steering System - Except Electric Vehicle — Electronic Steering

Overview

The EPAS system provides steering assist to the driver by replacing the conventional, hydraulic valve system with a steering gear equipped with an integrated electrical motor and PSCM. The motor operation and level of steering assist provided is controlled by the PSCM.

Scheme 1

Scheme 1: System Diagram

Description

For Electronic Power Assisted Steering System and Battery Voltage - Circuit Voltage Below Threshold, Circuit Voltage Above Threshold and Event Information, refer to Pinpoint Test A .

For Steering Column Mounted EPAS - Steering Tracking, refer to Pinpoint Test O

During normal operation the PSCM continually monitors and adjusts the steering efforts based on torque sensor inputs to enhance the steering feel. Adjustments are made based on the torque sensor inputs to reduce the effect of pull or drift that may be experienced when driving on roads with a high degree of camber or induced by outside influences. If the level of compensation required to keep the vehicle driving straight ahead exceeds a predetermined level a DTC will be set.

DTC C1023:00 (Pull Drift Compensation Limit Exceeded: No Sub Type Information) - This DTC sets if the level of pull/drift experienced by the vehicle exceeds the limit of compensation available. Do not install a new EPAS assembly if this DTC is set.

The PSCM continuously monitors different vehicle parameters in order to detect high friction. If the calculated friction value exceeds a predetermined threshold a message will be displayed in the message center.

DTC C102D:00 (High Friction Inside Power Steering: No Sub Type Information) - Sets if high friction is detected inside the steering gear.

For Steering Angle Sensor - Signal Erratic, refer to Pinpoint Test E .

For Steering Angle Sensor, Steering Shaft Torque Sensor 1, Steering Shaft Torque Sensor 2, Motor and Control Module - Failure or Erratic, refer to Pinpoint Test B .

For Steering Column Mounted EPAS - Steering Angle Sensor, Steering Shaft Torque Sensor 1, Steering Shaft Torque Sensor 2, Motor and Control Module - Failure or Erratic, refer to Pinpoint Test M .

For Transmission Friction Element G Performance/Stuck Off - Component Failure, refer to Pinpoint Test F .

DTC U0001:08 (High Speed Can Communication Bus: Bus Signal/Message Failures) - This DTC sets if the CAN messages received by the PSCM do not match the message list stored in the PSCM.
DTC U0001:88 (High Speed Can Communication Bus: Bus Off) - This DTC sets if the PSCM is unable to communicate with any other modules on the HS-CAN network for greater than 320 milliseconds.

DTC U0100:00 (Lost Communication with ECM/PCM A: No Sub Type Information) - This DTC sets if communications between the PSCM and the PCM fail. If the engine speed signal is missing for greater than 1 second(s) this DTC sets.

DTC U0121:00 (Lost Communication with the Anti-lock Brake System (ABS) Control Module: No Sub Type Information) - This DTC sets when communication between the PSCM and the ABS module fails. If the vehicle speed message is missing for 1 second(s) this DTC sets.

DTC U0126:00 (Lost Communication With the Steering Angle Sensor Module: No Sub Type Information) - This DTC sets if the communication between the PSCM and the SASM fails. If the steering angle message is missing for 1 second(s) or the sensor is not initialized this DTC sets.

DTC U0140:00 (Lost Communication with the Body Control Module: No Sub Type Information) - This DTC sets when communication between the PSCM and the BCM module fails. If the power mode message is missing for 1 second (s) or if the vehicle configuration and information data is not transmitted to the PSCM from the BCM.

U0151:00 will set in a module that is reporting a communication fault from another module on the data bus. The module that reports the fault is not the problem module. Do not install a new OCSM as part of the repair for DTC U0151:00.

REFER to MODULE COMMUNICATIONS NETWORK to diagnose lost communication with the Restraints Control Module (RCM).

For DTC U0155, Go to QA10, refer to PINPOINT TESTS QA .

Note. The parking assist control module is integral to the parking aid module.

DTC U0159:00 (Lost Communication With Parking Assist Control Module A: No Sub Type Information) - This DTC sets if communication between the PSCM and the Parking Aid Module (PAM) module fails. if the steering angle request message from the PAM is missing for 250 ms this DTC sets.

The PSCM is self monitoring and will carry out self-tests at specific intervals (initial power up, power down, during normal operation, etc.). Each self-test requires the voltage supply to the PSCM to be at or above a specific level (above 6 volts, above 9 volts, between 11 and 16 volts, etc.) for the test to take place. If one or more of the self-tests fail, the module sets one or more DTCs.

DTC U0300:00 (Internal Control Module Software Incompatibility: No Sub Type Information) - This DTC is set if the PSCM detects a configuration data failure or a mismatch between the stored and retrieved data during self-test.

DTC U0415:00 (Invalid Data Received From Anti-Lock Brake System [ABS] Control Module: No Sub Type Information) This DTC sets if the PSCM detects invalid signals for more than 1 second(s).

DTC U0422 (Invalid Data Received from Body Control Module: No Sub Type Information) - This DTC sets if the PSCM receives invalid or unknown data from the BCM. This DTC indicates a missing or invalid power mode message from the BCM.

For DTC U0423, go to QA, refer to PINPOINT TESTS QA .

The PSCM monitors the HS-CAN bus when the ignition has been on for more than 5 seconds, when the voltage to the PSCM is greater than 9 volts and when there are no DTCs present that are inhibiting PSCM operation. The SASM broadcasts steering angle data including the absolute steering angle in a message over the HS-CAN.

DTC U0428:00 (Invalid Data Received from Steering Angle Sensor Module: No Sub Type information) - This DTC sets if the PSCM detects an invalid signal from the SASM.
DTC U0428:62 (Invalid Data Received from Steering Angle Sensor Module: Signal Compare Failure) - This DTC sets if the absolute steering angle broadcast from the SASM does not match the internal comparison value.

Note. The parking assist control module is integral to the parking aid module.

DTC U045A:00 (Invalid Data Received from Parking Assist Control Module A: No Sub Type Information) - This DTC sets if the PSCM detects an invalid steering angle request signal transmitted by the PAM.

For Steering Angle Sensor, Steering Shaft Torque Sensor 1, Steering Shaft Torque Sensor 2, Motor and Control Module - Failure or Erratic, refer to Pinpoint Test B .

When the EPAS gear is installed, the PSCM must be configured with the vehicle information. Configuration is checked during initial PSCM power up (ignition ON) with the voltage supply to the PSCM greater than 6 volts.

DTC U2100:00 (Initial Configuration Not Complete: No Sub Type Information). This DTC sets if a valid VIN has never been received by the PSCM or valid configuration data has never been received by the PSCM. This DTC sets if PSCM detects the vehicle data configuration or the component base data configuration is missing or incomplete.

At each power up the PSCM reads the vehicle configuration data broadcast by the BCM and cross checks it with the PSCM internally stored data.

DTC U2101:00 (Control Module Configuration Incompatible: No Sub Type Information) - This DTC sets if the PSCM receives invalid vehicle configuration data.
DTC U2101:56 (Control Module Configuration Incompatible: No Sub Type Information) - This DTC sets if the central car configuration data does not match the equipment installed to the vehicle. This DTC can set if the vehicle is not configured for active park assist but the PSCM is receiving messages from the PAM.

The PSCM is self monitoring and will carry out self-tests at specific intervals (initial power up, power down, during normal operation, etc.). If one or more of the self-tests fail, the module sets one or more DTCs.

DTC U3000:42 (Control Module: General Memory Failure) - This DTC sets if the PSCM detects an internal memory data error during the data plausibility check.
DTC U3000:46 (Control Module: Calibration/Parameter Memory Failure) - This DTC sets if the PSCM detects an internal calibration data error during the data plausibility check.
DTC U3000:49 (Control Module: Internal Electronic Failure) - If at any time during normal operation the PSCM detects an internal hardware error, DTC U3000:49 is set.
DTC U3000:53 (Control Module: Deactivated) - This DTC sets if the PSCM detects an internal error which causes a permanent de-activation which is not recoverable with an ignition cycle.
DTC U3000:56 (Control Module: Invalid/Incomplete Configuration) - This DTC sets if the PSCM detects a mismatch of data structure in the non-volatile memory.
DTC U3000:96 (Control Module: Component Internal Failure) - This DTC sets if a fault causes the EPAS to enter a failure mode.

DTC U3003:13 (Battery Voltage: Circuit Open) - If the PSCM detects a loss of battery voltage or ground with the engine running, this DTC sets.
DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - If the voltage supply to the PSCM falls below 9 volts with the ignition ON and the engine speed above 500 rpm, DTC U3003:16 sets.
DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - If the voltage supply to the PSCM exceeds 16 volts for 1 second with the ignition ON, DTC U3003:17 sets.
DTC U3003:1C (Battery Voltage: Circuit Voltage Out of Range) - If the voltage supply to the PSCM exceeds 22 volts for greater than 400 ms this DTC sets.

For Steering Column Mounted EPAS - Steering Angle Sensor, Steering Shaft Torque Sensor 1, Steering Shaft Torque Sensor 2, Motor and Control Module - Failure or Erratic, refer to Pinpoint Test M .

Normal Operation

The power steering control module (PSCM) is supplied voltage through one high current and one low current circuit. The low current circuit is dedicated for PSCM module power. This allows the PSCM to monitor and detect system power concerns on the high current circuit. The entire electric power assist steering (EPAS) system uses one ground. Although the ground circuit is not directly monitored, ground circuit concerns may be interpreted by the PSCM as voltage supply concerns. Specific circuit schematics are provided in POWER STEERING CONTROLS .

Concerns with the vehicle electrical system or with the circuits described above may result in reduced steering assist. If voltage levels reach specific fault trigger conditions a message will be displayed in the message center and the PSCM will store a U3003 DTC. The specific fault trigger conditions associated with the U3003 DTCs are listed in the DTC Index - Power Steering Control Module (PSCM) .

Note. Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

Scheme 2

Scheme 2: Normal Operation

Circuit	Pin
GND (Ground) - GD120	2(BLACK)
B+ (Battery Positive Voltage) - SBB03	1(BLUE)

Harness Side

A1 : CHECK PSCM DTCS Review the returned PSCM DTCs. NOTE: The PSCM reporting only EPAS Event Information DTCs (xxxxx:68) does not indicate a concern with the EPAS system. Are EPAS Event Information DTCs (xxxxx:68) the only DTCs present? Yes No Go to A2. Go to A3 .
A2 : FAULT CONDITION CONFIRMATION Is the vehicle experiencing heavy steering or a lack of steering assist? Yes No REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(ref-515975) to diagnose the battery and charging system. CLEAR the DTCs. REPEAT the self-test. This fault may have been caused by the battery voltage dropping below the required parameters during engine cranking.
A3 : RETRIEVE ALL CMDTCS FROM ALL MODULES Start the vehicle. Make sure the engine ready indicator is illuminated for battery electric vehicles. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Is the PCM AND at least one other module in addition to the PSCM reporting charging system and/or battery voltage DTCs? Yes No REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(ref-515975) to diagnose the battery and charging system. Go to A4.
A4 : CHECK THE CONDITION OF THE BATTERY Ignition OFF. REFER to «PINPOINT TEST A: BATTERY CONDITION TEST»(ref-515950-S04058387882012120400000) . Does the battery pass the condition test? Yes No Go to A5. INSTALL a new 12-volt battery. Refer to «BATTERY»(ref-515950-S24138183982012120400000) . Clear the PSCM DTCs. REPEAT the self-test.
A5 : CHECK THE BATTERY STATE OF CHARGE Review the results from the battery condition test. Did the battery require a recharge? Yes No REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(ref-515975) to diagnose the battery and charging system. Go to A6.
A6 : CHECK CHARGING SYSTEM VOLTAGE Start the vehicle. Make sure the engine ready indicator is illuminated for battery electric vehicles. Turn off all accessories. Measure the voltage between: (+) 12 Volt Vehicle Battery (-) 12 Volt Vehicle Battery Positive terminal Negative terminal Turn the headlamps on and set the HVAC fan to high. Measure the voltage between: (+) 12 Volt Vehicle Battery (-) 12 Volt Vehicle Battery Positive terminal Negative terminal Are the voltages between 13 and 15.2 volts? Yes No Go to A7. REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(ref-515975) to diagnose the battery and charging system.
A7 : CHECK THE BATTERY VOLTAGE STATUS PID Turn the steering wheel from lock to lock with the vehicle running and note the PID reading while holding the wheel in a lock position. Access the PSCM and monitor the MOD_SUP_V (VOLT) PID. Does the PID match the loaded battery voltage +/- 1.5 volts? Yes No An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): PSCM_A Connector PSCM_B Connector Clear the PSCM DTCs. REPEAT the self-test. Go to A11 .
A8 : CHECK THE BATTERY VOLTAGE STATUS PID Turn the steering wheel from lock to lock with the vehicle running and note the PID reading while holding the wheel in a lock position. Access the PSCM and monitor the MOD_SUP_V (VOLT) PID. Does the PID match the loaded battery voltage +/- 1.5 volts? Yes No An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): PSCM_A Connector PSCM_B Connector CLEAR the DTCs. REPEAT the self-test. Go to A10 .
A9 : CHECK THE PSCM BATTERY VOLTAGE INPUT CIRCUIT FOR AN OPEN Ignition OFF. Battery Junction Box_F1 connector disconnected. Battery Junction Box_F2 connector disconnected. PSCM_A connector disconnected. (C1463A) Measure the resistance between: (+) Battery Junction Box_F1, Harness Side (-) PSCM_A (C1463A) Connector, Harness Side PSCM B+ B+ - SBB03 - Pin 1 Measure the resistance between: (+) Battery Junction Box_F2, Harness Side (-) PSCM_A (C1463A) Connector, Harness Side PSCM B+ B+ - SBB03 - Pin 1 Is the resistance less than 0.5 Ohm? Yes No Go to A12 . REPAIR the open circuit. INSPECT the PSCM connectors for corrosion, spread terminals and pushed-out terminals. REPAIR as necessary. If the connectors are okay, REPAIR the PSCM battery voltage input circuit. Clear the PSCM DTCs. REPEAT the self-test.
A10 : CHECK THE PSCM BATTERY VOLTAGE INPUT CIRCUIT FOR AN OPEN Ignition OFF. Disconnect the positive battery cable, refer to the «BATTERY DISCONNECT AND CONNECT»(ref-515950-S24980559872012120400000) . PSCM_A connector disconnected. (C1463A) Measure the resistance between: (+) Vehicle Battery (-) PSCM_A (C1463A) Connector, Harness Side Positive terminal B+ - SBB03 - Pin 1 Is the resistance less than 0.5 Ohm? Yes No Go to A12 . REPAIR the open circuit. INSPECT the PSCM connectors for corrosion, spread terminals and pushed-out terminals. REPAIR as necessary. If the connectors are okay, REPAIR the PSCM battery voltage input circuit. Clear the PSCM DTCs. REPEAT the self-test.
A11 : CHECK THE PSCM BATTERY VOLTAGE INPUT CIRCUIT FOR AN OPEN Ignition OFF. High-current Battery Junction Box connector disconnected. (C1317B) PSCM_A connector disconnected. (C1463A) Measure the resistance between: (+) High-current Battery Junction Box (C1317B) Connector, Harness Side (-) PSCM_A (C1463A) Connector, Harness Side B+ - SBB03 (BLUE) - Pin 1 B+ - SBB03 - Pin 1 Is the resistance less than 0.5 Ohm? Yes No Go to A12. REPAIR the open circuit. Clear the PSCM DTCs. REPEAT the self-test.
A12 : CHECK THE PSCM GROUND Inspect ground G108 for looseness and corrosion. Are the ground bolt and eyelet tight and free from any corrosion? Yes No INSPECT the PSCM wiring harness and connectors for damage, corrosion, spread terminals or pushed out pins. If the connectors are okay, REPAIR the PSCM ground circuit. CLEAN and TIGHTEN ground connection. CLEAR the DTCs. REPEAT the self-test.

The power steering control module (PSCM) monitors various inputs and outputs of the electronic power assist steering (EPAS) system in order to keep the system operating at peak capacity. Information provided by sensors (steering torque, vehicle speed, vehicle travel distance, etc.) are all compared to programmed and learned information. Likewise, outputs like the motor and steering rack (travel) are tested against programmed and learned information.

Note. If a damaged bellows boot(s) was discovered during Inspection and Verification and this pinpoint test DOES NOT lead to the installation of a new EPAS gear or bellows boot(s), then go to PINPOINT TEST K to address the damaged boot(s) before returning the vehicle to the customer.

B1 : CHECK FOR PREVIOUSLY SET DTCS Go to «KNOWN CONCERNS»(ref-515947-S27100989082013022100000) . Check for DTCs listed in the information: System Related CMDTCs cleared since initial read. Yes No Go to B2. Go to B2.
B2 : INSPECT EPAS GEAR WIRING HARNESS With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-515942) . Ignition OFF. Thoroughly inspect the wire harness along the top of the EPAS gear for cuts, breaks and pinched wires. Disconnect all 3 EPAS gear electrical connectors and inspect them for corrosion, pushed-out pins, bent pins and spread terminals. Is the wire harness undamaged and are all 3 connectors in good condition? Yes No CONNECT all 3 EPAS gear electrical connectors. Go to B3. If the connector(s) are not okay, then REPAIR them. Otherwise, REPAIR the wire harness and whatever caused the damage to the wire harness. Go to B3.
B3 : TEST DRIVE TO CHECK FOR RETURNING DTCS NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws. Clear the PSCM DTCs. Cycle the ignition to OFF and then back to RUN. Test drive the vehicle in the following manner: With the engine running/ready, stop the vehicle on an unsealed concrete or asphalt surface (in order to provide adequate friction for a thorough test). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. The test drive is complete. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Does DTC C1B00:62, C200B:2F, C200B:61, C200C:2F, U2011:49, &2011:61, U3000:41, U3000:46 and/or U3000:49 return? Yes No INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . The condition set the DTC is not present at this time. RETURN the vehicle to the customer. For all other PSCM DTCs, REFER to the «DTC Index - Power Steering Control Module (PSCM)»(ref-515947-S09015220052013022100000) .

C1 : CHECK PSCM DTCS Review the returned PSCM DTCs. Is DTC U3000:96 present? Yes No INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . Go to C3 .
C2 : VERIFY PRESENCE OF EPAS GEAR HEAT SHIELD Make sure the EPAS gear heat shield is present and installed correctly. Refer to «Steering Gear»(ref-515947-S17880110562012120400000) . Is the heat shield present and is it installed correctly? Yes No Go to C3. REINSTALL the heat shield or INSTALL a new heat shield as necessary. Go to C3.
C3 : TEST DRIVE TO CHECK FOR RETURNING DTCS Clear the PSCM DTCs. Cycle the ignition to OFF and then back to RUN. NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws. Test drive the vehicle in the following manner: With the engine running/ready, stop the vehicle on an unsealed concrete or asphalt surface (in order to provide adequate friction for a thorough test). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. NOTE: The next portion of the test drive will require the vehicle to be driven at highway speeds. NOTE: The test period is a cumulative time of 10 minutes. Stopping, going slower than 72 km/h (45 mph) or faster that 96 km/h (60 mph) will not affect the test as long as a total time of 10 minutes is spent between 72-96 km/h (45-60 mph) with at least 4 lane changes during that time/speed window. Continue test driving the vehicle in the following manner: Bring the vehicle to a minimum speed of 72 km/h (45 mph), maximum of 96 km/h (60 mph). Maintain that speed for at least 10 minutes. During this 10-minute time period, make a minimum of 4 lane changes or turns that achieve a steering wheel angle of at least 20 degrees. The test drive is complete. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Is DTC U3000:61 and/or U3000:96 present? Yes No INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . The condition set the DTC is not present at this time. RETURN the vehicle to the customer. For all other PSCM DTCs, REFER to the «DTC Index - Power Steering Control Module (PSCM)»(ref-515947-S09015220052013022100000) .

When the ignition is turned ON a relay inside the power steering control module (PSCM) is energized, which sends power to other portions of the module. The PSCM monitors this relay output and will set a DTC if output is not detected.

D1 : CHECK FOR RETURNING DTCS Clear the PSCM DTCs. Cycle the ignition to OFF and then back to RUN. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Is DTC U3000:72 present? Yes No INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . The condition to set the DTC is not present at this time. In cold climates or climates where frost is possible, the relay contacts could develop a layer of frost which may prevent a clean connection between the relay contacts. It may be necessary to allow the vehicle to remain outside overnight in a cold climate to duplicate the DTC trigger conditions. If the DTC was set during cold or frosty conditions, attempt to recreate the fault by allowing the vehicle to remain overnight in a cold or frosty environment. Go to D2. If the DTC was not set during cold or frosty conditions, RETURN the vehicle to the customer. No fault found. The condition which caused the concern is not present at this time.
D2 : ATTEMPT TO RECREATE THE FAULT CONDITIONS Park the vehicle in a cold or frosty environment and allow it to remain there overnight. NOTE: Do not allow the vehicle to warm up before carrying out the PSCM self-test. Ignition ON, engine OFF. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Is DTC U3000:72 present? Yes No INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . The condition to set the STC is not present at this time. RETURN the vehicle to the customer.

The power steering control module (PSCM) will use the motor inside the electronic power assist steering (EPAS) gear to calculate the relative and actual steering wheel angle, and then transmit this information to other modules over the high-speed controller area network (HS-CAN) bus.

E1 : TEST DRIVE TO CHECK FOR RETURNING DTCS NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws. Clear the PSCM DTCs. Cycle the ignition to OFF and then back to RUN. Test drive the vehicle in the following manner: With the engine running/ready, stop the vehicle on an unsealed concrete or asphalt surface (in order to provide adequate friction for a thorough test). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. The test drive is complete. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Is DTC C1B00:2F present? Yes No Go to E2. The condition to set the DTC is not present at this time. DISCONNECT and INSPECT all 3 PSCM connectors for corrosion, bent terminals and/or pushed-out pins. REPAIR as necessary. If the connectors are okay, INSPECT the wire harness along the top of the EPAS gear for cuts, breaks and/or pinches. REPAIR as necessary. For all other PSCM DTCs, REFER to the «DTC Index - Power Steering Control Module (PSCM)»(ref-515947-S09015220052013022100000) .
E2 : INSPECT THE INNER TIE RODS With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-515942) . NOTE: When installing new bellows boots and clamps apply new lubricant as instructed to prevent water contamination or damage may result to the electronic power assist steering (EPAS) gear. For complete information refer to the «Tie Rod»(ref-515947-S32818924612012120400000) . Inspect the inner tie rods for correct installation. Refer to «Tie Rod»(ref-515947-S32818924612012120400000) . Are the inner tie rods correctly installed? Yes No INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . INSTALL new inner tie rod(s), bellows boot(s) and clamps as necessary. REFER to «Tie Rod»(ref-515947-S32818924612012120400000) .

F1 : CHECK AND RECORD THE LEFT FRONT AND RIGHT FRONT TIRE PRESSURES Check and record the left front and right front tire pressures. Compare the recorded tire pressure readings with the information on the vehicle certification (VC) label. Is the air pressure in the tires correct as indicated on the VC label? Yes No Go to F2. ADJUST the air pressure in the tires. Go to F2.
F2 : CHECK FOR UNLOADED STEERING RACK TRAVEL FEEL With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-515942) . Ignition OFF. Raise the vehicle until the front wheels no longer touch the ground. Rotate the steering wheel from lock-to-lock and inspect the steering rack travel for the following: Abnormal noises Rough spots Sticky spots Tight spots Is steering rack travel smooth and free of any abnormal noises, rough, sticky and tight spots? Yes No Go to F4 . Go to F3.
F3 : INSPECT THE INNER TIE RODS AND STEERING RACK FOR CORROSION NOTE: When installing new bellows boots and clamps apply new lubricant as instructed to prevent water contamination or damage may result to the electronic power assist steering (EPAS) gear. For complete information refer to the «Tie Rod»(ref-515947-S32818924612012120400000) . Remove the outer tie rod and bellows boot. Refer to «Tie Rod»(ref-515947-S32818924612012120400000) . The following inspection must be carried out on BOTH sides of the steering rack: Turn the steering wheel in one direction all the way until it stops to expose the steering rack. Inspect the rack, inner tie rod and gear housing for rust, moisture, corrosion and other signs of harmful contamination. Is the rack, inner tie rod and gear housing free of moisture, rust, corrosion and other harmful contamination? Yes No No fault found. The condition which caused the concern is not present at this time. The condition may have been caused by under inflated tires. INSTALL new bellows boots with new clamps and install the removed outer tie rods. REFER to «Tie Rod»(ref-515947-S32818924612012120400000) . ADJUST the front toe setting. REFER to «FRONT TOE ADJUSTMENT»(ref-515945-S37548427432012120400000) . INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) .
F4 : TEST DRIVE TO CHECK FOR RETURNING DTCS Clear the PSCM DTCs. Cycle the ignition to OFF and then back to RUN. NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws. Test drive the vehicle in the following manner: With the engine running/ready, stop the vehicle on an unsealed concrete or asphalt surface (in order to provide adequate friction for a thorough test). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. NOTE: The next portion of the test drive will require the vehicle to be driven at highway speeds. NOTE: The test period is a cumulative time of 10 minutes. Stopping, going slower than 72 km/h (45 mph) or faster that 96 km/h (60 mph) will not affect the test as long as a total time of 10 minutes is spent between 72-96 km/h (45-60 mph) with at least 4 lane changes during that time/speed window. Continue test driving the vehicle in the following manner: Bring the vehicle to a minimum speed of 72 km/h (45 mph), maximum of 96 km/h (60 mph). Maintain that speed for at least 10 minutes. During this 10-minute time period, make a minimum of 4 lane changes or turns that achieve a steering wheel angle of at least 20 degrees. The test drive is complete. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Is DTC C102D present? Yes No INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . The condition set the DTC is not present at this time. RETURN the vehicle to the customer. For all other PSCM DTCs, REFER to the «DTC Index - Power Steering Control Module (PSCM)»(ref-515947-S09015220052013022100000) .

With a fully charged battery and the ignition ON, the electronic power assist steering (EPAS) system should provide adequate assist to maneuver the vehicle and should be able to return to the straight-ahead position with little difficulty. The assist provided by the EPAS system should be smooth and consistent at all times. The steering and suspension components should be free of any binding conditions and should not interfere with the steering assist provided by the EPAS system.

If the steering wheel is held at lock end for more than 2 seconds the EPAS system will reduce assist noticeably. This is a normal condition programmed into the power steering control module (PSCM) to protect the system from permanent damage.

I1 : CHECK CHARGING SYSTEM VOLTAGE Start the vehicle. Make sure the engine ready indicator is illuminated for battery electric vehicles. With the vehicle running, turn the steering wheel from lock to lock and take the voltage measurement while holding the wheel in a lock position. Measure the voltage between: (+) 12 Volt Vehicle Battery (-) 12 Volt Vehicle Battery Positive terminal Negative terminal Turn the steering wheel from lock to lock with the vehicle running and note the PID reading while holding the wheel in a lock position. Access the PSCM and monitor the MOD_SUP_V (VOLT) PID. Is the battery voltage greater than 13 volts and does the PID match battery voltage +/- 1.5 volts? Yes No Go to I2. Go to A4 .
I2 : CHECK THE EPAS GEAR With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-515942) . Isolate the steering gear from the steering knuckles. NOTE: Do not disconnect the steering gear from the steering column. Turn the steering wheel through the full range of motion (lock-to-lock) Is the binding condition still present? Yes No Go to I3. The condition may be caused by tires, wheel knuckles and/or ball joints. ISOLATE the component(s) causing the binding. INSTALL new component(s) as necessary. DRIVE the vehicle to VERIFY the repair.
I3 : CHECK THE STEERING COLUMN SHAFT AND DASH SEAL While turning the steering wheel, check for binding conditions between the moving components of the steering column and the vehicle body and steering column shroud(s). Steering wheel rubbing against steering column shrouds. Binding steering column shaft dash panel seal Has a binding condition been identified? Yes No ISOLATE the component(s) causing the binding. INSTALL new component(s) as necessary. REFER to «STEERING COLUMN»(ref-515978) . DRIVE the vehicle to VERIFY the repair. Go to I4.
I4 : CHECK THE STEERING GEAR Using a suitable steering wheel holding device, hold the steering wheel in the straight ahead position. Disconnect the steering gear from the steering column. Check the steering gear for correct installation, tight spots and uneven operation. Is the binding condition still present? Yes No INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . DRIVE the vehicle to VERIFY the repair. ISOLATE the component(s) that is causing the binding. INSTALL a new component(s) as necessary. REFER to «STEERING COLUMN»(ref-515978) . DRIVE the vehicle to VERIFY the repair.
I5 : CHECK THE STEERING GEAR With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-515942) . Isolate the steering gear from the steering knuckles. NOTE: Do not disconnect the steering gear from the steering column. Turn the steering wheel through the full range of motion (lock-to-lock) Is the binding condition still present? Yes No Go to I6. ISOLATE the component(s) causing the binding. INSTALL new component(s) as necessary.
I6 : CHECK THE STEERING COLUMN FOR BINDING CONDITIONS While turning the steering wheel, check for binding conditions between the moving components of the steering column and the vehicle body and steering column shroud(s). Steering wheel rubbing against steering column shrouds. Binding steering column shaft dash panel seal Has a binding condition been identified? Yes No ISOLATE the component(s) causing the binding. INSTALL new component(s) as necessary. Go to I7.
I7 : CHECK THE STEERING GEAR NOTE: The steering column must be locked in the straight ahead position using the service bolt (HB1), before the column is disconnected from the steering gear to prevent damage to the EPAS sensor internal clock-spring. Make sure that the steering wheel is set to the straight ahead position. Lock the steering column using the service bolt. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . Disconnect the steering gear from the steering column. Check the steering gear for correct installation, tight spots and uneven operation. Check the steering column U-joints for binding and uneven movement. Has a binding condition been identified? Yes No For Steering column shaft U-joints: INSTALL a new steering column shaft. REFER to «STEERING COLUMN»(ref-515978) . For Steering gear: INSTALL a new steering gear as necessary. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . INSTALL a new EPAS assembly. REFER to «STEERING COLUMN»(ref-515978) .

The tie rods connect the electronic power assist steering (EPAS) gear to the wheel knuckles. There should be very little to no vertical or lateral movement in the inner and outer tie rod studs/sockets. Some rotational movement is acceptable.

J1 : CHECK THE INNER AND OUTER TIE RODS FOR MOVEMENT With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-515942) . NOTE: When installing new bellows boots and clamps, apply new lubricant as instructed to prevent water contamination or damage may result to the EPAS gear. For complete information refer to the «Tie Rod»(ref-515947-S32818924612012120400000) . Using hand force only, check the inner and outer tie rods for vertical and lateral movement in the tie-rod ball studs/sockets. Are the inner and outer tie rods free from any vertical and/or lateral movement? Yes No The condition may be caused by wheel/tire runout. REFER to «WHEELS & TIRES»(ref-515954) . INSTALL a new inner or outer tie rod as necessary. REFER to «Tie Rod»(ref-515947-S32818924612012120400000) .

The electric power assist steering (EPAS) gear is very susceptible to water, moisture, dust, rust and other contaminates. If a damaged boot is suspected the inner tie rods and steering rack should be inspected for contamination. If contamination is found a new EPAS gear should be installed.

New bellows boots and clamps must be installed whenever they are removed. To avoid unnecessary repairs address all other known concerns, DTCs and customer concerns before removing the bellows boots and inspecting the steering gear.

Note. When installing new bellows boots and clamps, apply new lubricant as instructed to prevent water contamination or damage may result to the EPAS gear. For complete information refer to the Tie Rod .

K1 : INSPECT THE INNER TIE RODS AND STEERING RACK FOR CORROSION Remove the outer tie rod and bellows boot. Refer to «Tie Rod»(ref-515947-S32818924612012120400000) . The following inspection must be carried out on BOTH sides of the steering rack: Turn the steering wheel in one direction all the way until it stops to expose the steering rack. Inspect the rack, inner tie rod and gear housing for rust, moisture, corrosion and other signs of harmful contamination. Is the rack, inner tie rod and gear housing free of moisture, rust, corrosion and other harmful contamination? Yes No INSTALL a new steering gear boot bellows. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) . ADJUST the front toe setting. REFER to «FRONT TOE ADJUSTMENT»(ref-515945-S37548427432012120400000) . INSTALL a new EPAS gear. REFER to «Steering Gear»(ref-515947-S17880110562012120400000) .

The power steering control module (PSCM) monitors various inputs and outputs of the electronic power assist steering (EPAS) system in order to keep the system operating at peak capacity. Information provided by sensors (steering torque, vehicle speed, vehicle travel distance, etc.) are all compared to programmed and learned information. Likewise, outputs like the motor and steering wheel position are tested against programmed and learned information.

M1 : CHECK FOR PREVIOUSLY SET DTCS Go to «KNOWN CONCERNS»(ref-515947-S27100989082013022100000) . Check for DTCs listed in the information: System Related CMDTCs cleared since initial read. Are any of the following DTCs present? PSCM DTCs, U0300:00, U2011:49, U2011:61, U3000:05, U3000:41, U3000:43, U3000:44, U3000:46, U3000:49, U3000:61, U3000:96, U3004:49, C1B00:2F, C1B00:61, C1B00:62, C200B:2F, C200B:61, C200B:62, C200C:2F, C200D:49. Yes No INSTALL a new EPAS column assembly. REFER to «STEERING COLUMN»(ref-515978) . Go to M2.
M2 : FAULT CONFIRMATION Ignition OFF. Wait 90 seconds for the module to exit the active state. Ignition ON, engine OFF. Clear the PSCM DTCs. Ignition OFF. Wait 90 seconds for the module to exit the active state. Ignition ON, engine running. Test drive the vehicle in the following manner: With the engine running/ready, stop the vehicle on an unsealed concrete or asphalt surface (in order to provide adequate friction for a thorough test). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. Return the steering wheel to the center position and move the vehicle forward approximately 32 cm (1 ft). With the vehicle in gear and the brakes applied, turn the steering wheel lock-to-lock. The test drive is complete. Ignition ON, engine OFF. Carry out the PSCM self-test. Are DTCs C1B00-2f, C1B00-61, C1B00-62, C200B-61, C200B-62, C200B-2f, C200C-2f, C200D-49, U0300, U2011-49, U2011-61, U3000-5, U3000-41, U3000-43, U3000-44, U3000-46, U3000-49 or U3000-96 present? Yes No INSTALL a new EPAS column assembly. REFER to «STEERING COLUMN»(ref-515978) . The condition to set the DTC is not present at this time. RETURN the vehicle to the customer.

Note. Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

Scheme 3

Scheme 3: Normal Operation

Circuit	Pin
B+ (Battery Positive Voltage) - SBB03	1(BLUE)

Harness Side

Scheme 4

Circuit

Harness Side

Scheme 5

Circuit	Pin
B+ (Battery Positive Voltage) - SBB03	1(BLUE)

Harness Side

N1 : RETRIEVE ALL CMDTCS FROM ALL MODULES Ignition ON, engine running. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Yes No REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(ref-515975) to diagnose the battery and charging system. Go to N2.
N2 : CHECK THE CONDITION OF THE BATTERY Ignition OFF. REFER to «PINPOINT TEST A: BATTERY CONDITION TEST»(ref-515950-S04058387882012120400000) . Does the battery pass the condition test? Yes No Go to N3. INSTALL a new 12-volt battery. CLEAR the DTCs. REPEAT the self-test.
N3 : CHECK THE BATTERY STATE OF CHARGE Review the results from the battery condition test. Did the battery require a recharge? Yes No REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(ref-515975) to diagnose the battery and charging system. Go to N4.
N4 : CHECK CHARGING SYSTEM VOLTAGE Ignition ON, engine running. Turn off all accessories. Measure the voltage between: (+) 12 Volt Vehicle Battery (-) 12 Volt Vehicle Battery Positive terminal Negative terminal Turn the headlamps on and set the HVAC fan to high. Measure the voltage between: (+) 12 Volt Vehicle Battery (-) 12 Volt Vehicle Battery Positive terminal Negative terminal Are the voltages between 13 and 15.2 volts? Yes No Go to N5. REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(ref-515975) to diagnose the battery and charging system.
N5 : CHECK THE PSCM MODULE VOLTAGE SUPPLY (MOD_SUP_V) PID Turn the steering wheel slowly from lock to lock and monitor the PID value displayed on the screen. Note the lowest PID reading value displayed while cycling the steering lock to lock. Access the PSCM and monitor the MOD_SUP_V (VOLT) PID. Does the lowest PID value displayed match the loaded battery voltage +/- 1.5 volts? Yes No An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other physical damage to the harness. If no fault is found in the circuit, suspect the following component(s): PSCM_A Connector PSCM_B Connector PSCM_C Connector To gain access to the EPAS electrical connectors, the knee air bag module will need to be removed. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-515937) for additional information. CLEAR the DTCs. REPEAT the self-test. Go to N6.
N6 : CHECK HIGH-CURRENT BJB FUSE 2 (60A) Ignition OFF. Check the condition of high-current BJB fuse 2 (60A), attached to the battery positive terminal. Check the fuse connection for security, damage and corrosion. Is the fuse in good condition and the fuse connection secure and free from damage or contamination? Yes No Go to N7. Loose electrical connection. CLEAN and TIGHTEN the electrical connection. To gain access to the EPAS electrical connectors, the knee air bag module will need to be removed. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-515937) for additional information. CLEAR the DTCs. REPEAT the self-test. Blown fuse. Install a new fuse. CLEAR the DTCs. REPEAT the self-test.
N7 : CHECK THE PSCM BATTERY VOLTAGE INPUT CIRCUIT FOR AN OPEN NOTE: To gain access to the EPAS electrical connectors, the knee air bag module will need to be removed. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-515937) for additional information. PSCM_A connector disconnected. (C1463A) High-current Battery Junction Box connector disconnected. (C1317B) Measure the resistance between: (+) High-current Battery Junction Box (C1317B) Connector, Harness Side (-) PSCM_A (C1463A) Connector, Harness Side B+ - SBB03 (BLUE) - Pin 1 B+ - SBB03 - Pin 1 Is the resistance less than 5 Ohm? Yes No Go to N8. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
N8 : CHECK THE PSCM GROUND Inspect ground G200 for looseness and corrosion. Are the ground bolt and eyelet tight and free from any corrosion? Yes No REPAIR the open circuit. INSPECT the PSCM connectors for corrosion, spread terminals and pushed-out terminals. REPAIR as necessary. To gain access to the EPAS electrical connectors, the knee air bag module will need to be removed. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-515937) for additional information. If the connectors are okay, REPAIR the PSCM ground circuit. CLEAR the DTCs. REPEAT the self-test. CLEAN and TIGHTEN ground connection. CLEAR the DTCs. REPEAT the self-test.

The PSCM continually monitors and adjusts steering efforts based on the torque sensor inputs to enhance feel of the steering system. Compensation is made to reduce the effect of pull or drift that may be experienced when driving on roads with a high degree of camber. If the level of compensation required to keep the vehicle driving straight ahead exceeds a pre set level a DTC will be set.

O1 : VISUAL INSPECTION Carry out a visual inspection. Check for even tire sizes and pressures as per the manufacturer's specification. Check for uneven tire wear. Check the outer tie rod ends and suspension ball joints for impeded movement. Verify that the steering column shaft rotates freely and is not grounded against other vehicle components. Check the steering gear for correct installation, tight spots and uneven operation. Check the steering and suspension for bent or damaged components. Check the steering and suspension geometry. Has a concern been identified? Yes No REPAIR the concern identified during the visual inspection. CLEAR the DTCs. CARRY OUT the steering angle sensor calibration procedure. REFER to PROGRAMMABLE PARAMETERS/STEERING WHEEL POSITION SENSOR CALIBRATION on the IDS and follow the calibration procedure. CLEAR the DTCs. CARRY OUT the steering angle sensor calibration procedure. REFER to PROGRAMMABLE PARAMETERS/STEERING WHEEL POSITION SENSOR CALIBRATION on the IDS and follow the calibration procedure.

The steering wheel position must be calibrated to the straight ahead position after installation of a new steering column, a new steering column intermediate shaft, repairs to the vehicle suspension or adjustment of the vehicle steering and suspension geometry.

P1 : STEERING ANGLE SENSOR CALIBRATION Ignition ON, engine running. Turn the steering wheel approximately thirty degrees in each direction, then return to the central position. Make sure that the steering wheel is set to the straight ahead position. Ignition ON, engine OFF. With the vehicle stationary run the steering angle sensor calibration procedure. REFER to PROGRAMMABLE PARAMETERS/STEERING WHEEL POSITION SENSOR CALIBRATION on the IDS and follow the calibration procedure. Clear the PSCM DTCs. Ignition OFF. Wait 90 seconds for the module to exit the active state. Ignition ON, engine OFF. Carry out the PSCM self-test. Are DTCs C1B00-95 or C1B00-54 present? Yes No INSTALL a new EPAS assembly. The customers concern has been corrected.

The tie rods connect the steering gear to the wheel knuckles. There should be very little to no vertical or lateral movement in the inner and outer tie rod studs/sockets. Some rotational movement is acceptable.

Q1 : CHECK THE INNER AND OUTER TIE RODS FOR MOVEMENT With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-515942) . Using hand force only, check the inner and outer tie rods for vertical and lateral movement in the tie-rod ball studs/sockets. Are the inner and outer tie rods free from any vertical and/or lateral movement? Yes No Go to Q2. INSTALL a new inner or outer tie rod as necessary. REFER to «Tie Rod»(ref-515947-S32818924612012120400000) .
Q2 : CHECK THE SUSPENSION BALL JOINTS AND BUSHINGS FOR DAMAGE, SECURITY, EXCESSIVE FREE PLAY AND IMPEDED MOVEMENT Check the suspension ball joints and bushings for damage, security, excessive free play and impeded movement. Has a concern been identified? Yes No REPAIR as necessary. The condition may be caused by wheel/tire runout. REFER to «WHEELS & TIRES»(ref-515954) .

T1 : VISUAL INSPECTION Carry out a visual inspection. Check for even tire sizes and pressures as per the manufacturer's specification. Check for uneven tire wear. Check the outer tie rod ends and suspension ball joints for impeded movement. Verify that the steering column shaft rotates freely and is not grounded against other vehicle components. Check the steering gear for correct installation, tight spots and uneven operation. Check the steering and suspension for bent or damaged components. Check the steering and suspension geometry. Has a concern been identified? Yes No REPAIR the concern identified during the visual inspection. CLEAR the DTCs. Using the scan tool, RESET the compensation value for the pull/drift compensation function and the compensation value for the steering straight ahead position. TEST the system for normal operation. CLEAR the DTCs. Using the scan tool, RESET the compensation value for the pull/drift compensation function and the compensation value for the steering straight ahead position. TEST the system for normal operation.

The SASM broadcasts the absolute steering angle value to the PSCM over the HS-CAN at predefined intervals during every drive cycle from the first ignition ON status. During normal operation the absolute steering angle from the SASM is compared against a steering angle derived from the rear wheel speed values broadcast by the ABS module over the HS-CAN and an angle derived from the EPAS motor position. If the absolute steering angle values and the derived steering angles do not match, the EPAS system will set to a default level of assistance.

U1 : CHECK FOR SASM DTCS Ignition ON, engine OFF. Press Read Vehicle Information button to retrieve DTC s from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions. Are any SASM DTCs present? Yes No REFER to «DIAGNOSIS AND TESTING»(ref-515969-S16150934602012120400000) to diagnose the SASM concern. Go to U2.
U2 : CHECK THE SASM FOR CORRECT INSTALLATION Check the SASM for correct installation. Refer to «DIAGNOSIS AND TESTING»(ref-515969-S16150934602012120400000) . Make sure that the steering wheel is set to the straight ahead position. Access the PSCM and monitor the SW_ANGLE (ANGL) PID. Is the angle between -4 deg - 4 deg? Yes No The condition to set the DTC is not present at this time. CLEAR the DTCs. TEST the system for normal operation. CHECK the SASM for correct installation. REFER to «DIAGNOSIS AND TESTING»(ref-515969-S16150934602012120400000) .

Power Steering System - Except Electric Vehicle: Overview Ford Focus III

Overview

Scheme 1

Description

Normal Operation

Scheme 2

Scheme 3

Scheme 4

Scheme 5

More articles — Power Steering System - Except Electric Vehicle

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