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Steering System (Inspection & Testing): Overview Ford Mustang V рестайлинг 2

Manual & Power Steering 3 illustrations ~10087 words

Description

The PSCM will monitor the voltage supplied by the 12-volt battery and charging system and set the appropriate DTC when necessary.

DTC B1304:68 (Electronic Power Assisted Steering System: Event Information) - This DTC sets if the battery voltage falls below 11.7 volts for more than 1 second with the ignition ON and the engine speed above 500 rpm.

The PSCM uses a thermistor to monitor the internal temperature of the EPAS gear. This DTC appearing by itself does not indicate a fault condition in the steering system. Diagnose all other EPAS DTCs before diagnosing B1D23:68.

  1. DTC B1D23:68 (Overheat Sensor: Event Information) - This DTC sets if the internal temperature of the EPAS gear exceeds a predetermined threshold. When this DTC is set steering assist will be reduced, but not removed.

While the ignition is ON and the voltage supply to the PSCM is above 6.5 volts, the module monitors the motor inside the EPAS gear to calculate the relative and actual steering wheel angle. This value is transmitted to other modules over the HS-CAN bus.

  1. DTC C1B00:2F (Steering Angle Sensor: Signal Erratic) - This DTC sets if the steering angle sensor signal is calculated to be outside the expected range. This DTC will be set if an over travel concern is detected within the steering gear.
  2. DTC C1B00:62 (Steering Angle Sensor: Signal Compare Failure) - This DTC sets if the calculated signal does not match other sensor inputs.

The PSCM continually monitors the steering shaft torque sensor when the ignition is ON and the voltage supply to the PSCM is above 6.5 volts.

  1. DTC C200B:2F (Steering Shaft Torque Sensor 1: Signal Erratic) - If the steering shaft torque sensor signal is outside the expected range, then DTC C200B:2F will be set.
  2. DTC C200B:61 (Steering Shaft Torque Sensor 1: Signal Calculation Failure) - If the steering shaft torque sensor signal is not within a certain threshold, then DTC C200B:61 will be set.
  3. DTC C200B:62 (Steering Shaft Torque Sensor 1: Signal Compare Failure) - If the steering shaft torque sensor signal does not match other sensor input, then DTC C200B:62 will be set.

The PSCM monitors the amount of force needed to assist with vehicle steering when the ignition is ON and the voltage supply to the PSCM is above 9 volts, all other EPAS sensors are working correctly and the EPAS gear is providing assist.

  1. DTC P07AE:09 (Transmission Friction Element G Performance/Stuck Off: Component Failure) - If the amount of friction in the steering system exceeds the allowable threshold, DTC P07AE:09 sets. Low air pressure in the tires, seized or restricted movement in the outer tie rod ends or suspension ball joints could cause DTC P07AE:09 to set.

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 6.5 volts and when there are no DTCs present that are inhibiting PSCM operation.

DTC U0001:88 (High Speed CAN Communication Bus: Bus Off) - This DTC will set if the PSCM detects that transmission of HS-CAN bus messages is not acknowledged by other modules for 400 milliseconds or if the HS-CAN bus is deemed to have a communication error for greater than 5 seconds.

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 6.5 volts and when there are no DTCs present that are inhibiting PSCM operation.

  1. 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. The PCM sends 2 message bundles to the PSCM. If these messages are missing for more than 5 seconds and the PSCM has not set DTC U0001:88, the PSCM sets DTC U0100:00.

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 6.5 volts and when there are no DTCs present that are inhibiting PSCM operation.

  1. 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. The ABS module sends the following messages to the PSCM: Wheel speed, tire size, lateral acceleration, steering angle offset, traction control. If one or more of these messages is missing for more than 5 seconds (30 seconds for tire size) and the PSCM has not set DTC U0001:88, then the PSCM sets U0121:00.

The SJB is also identified as the GEM.

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 6.5 volts and when there are no DTCs present that are inhibiting PSCM operation.

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. When this DTC is set steering assist may be reduced.

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 6.5 volts and when there are no DTCs present that are inhibiting PSCM operation.

  1. DTC U0151:00 (Lost Communication with Restraints Control Module: No Sub Type Information) - This DTC sets when communication between the PSCM and the RCM fails.

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 6.5 volts and when there are no DTCs present that are inhibiting PSCM operation.

  1. DTC U0155:00 (Lost Communication with Instrument Panel Cluster (IPC) Control Module: No Sub Type Information) - This DTC will set when communication between the PSCM and the IPC module fails.

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 6.5 volts and when there are no DTCs present that are inhibiting PSCM operation.

  1. DTC U0401:68 (Invalid Data Received from ECM/PCM A: Event Information) - This DTC sets if the PSCM receives invalid or unknown messages from the PCM. Missing or invalid vehicle speed, engine speed messages or a missing tire size message sets PSCM DTC U0401:68.

The PSCM carries out a self-test of the motor inside the EPAS gear during vehicle start up and monitors the motor during normal driving conditions with voltage at the PSCM between 6.5 and 18 volts.

  1. DTC U2011:49 (Motor: Internal Electronic Failure) - This DTC sets if the EPAS motor power driver fails.
  2. DTC U2011:61 (Motor: Signal Calculation Failure) - This DTC sets if the integrity of the motor position signal exceeds or does not meet a calculated value.

When a new EPAS gear is installed, the PSCM must be configured with the vehicle information. If the configuration is not carried out, the PSCM will default to tuning table 1 on the first power up (ignition ON) and set the DTC U2100:00. Configuration is checked during initial PSCM power up (ignition ON) with the voltage supply to the PSCM greater than 6.5 volts.

  1. DTC U2100:00 (Initial Configuration Not Complete: No Sub Type Information) - This DTC will set if the initial PSCM configuration was not carried out or if the configuration fails. The PSCM sends a message to the IPC to display POWER STEERING ASSIST FAULT in the message center.

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 6.5 volts, above 9 volts, between 10 and 17 volts, etc.) for the test to take place.

  1. DTC U3000:46 (Control Module: Calibration/Parameter Memory Failure) - If at any time during normal operation with more than 6.5 volts supplied to the PSCM the module determines that one or more calibration files are missing/corrupt or that the incorrect EPAS gear is installed to the vehicle, DTC U3000:46 sets.
  2. DTC U3000:41 (Control Module: General Checksum Failure) - If at any time during normal operation the module detects an internal software error with more than 6.5 volts supplied to the PSCM, DTC U3000:41 sets.
  3. DTC U3000:49 (Control Module: Internal Electronic Failure) - If at any time during normal operation with more than 6.5 volts supplied to the PSCM the module detects a software or internal hardware error, DTC U3000:49 is set.
  4. DTC U3000:96 (Control Module: Component Internal Failure) - This DTC sets if there is an internal failure of the PSCM or if multiple failures have occurred over a short period of time. If one or more of the self-tests fail, the module sets one or more DTCs.

The PSCM will monitor the voltage supplied by the 12-volt battery and charging system and set the appropriate DTC when necessary.

  1. 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.
  2. DTC U3003:17 (Battery Voltage: Circuit Voltage Above Threshold) - If the voltage supply to the PSCM exceeds 18 volts for 1 second with the ignition ON, DTC U3003:17 sets.
  3. DTC U3003:68 (Battery Voltage: Event Information) - If the voltage supply to the PSCM is between 9 and 10.8 volts for 1 second with the ignition ON, DTC U3003:68 sets.

Normal Operation

The 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 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 SYSTEM WIRING DIAGRAMS .

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 or DTC B1304:68. The specific fault trigger conditions associated with the U3003 DTCs and DTC B1304:68 are listed in the DTC Index.

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

Scheme 1

Scheme 1: Normal Operation
Scheme 1: Normal Operation
CircuitPin
GND (Ground) - GD1251(BLACK)
B+ (Battery Positive Voltage) - SBF012(RED)

HARNESS SIDE

  1. A1: CHECK PSCM DTCS Review the returned PSCM DTCs. NOTE: The PSCM reporting only DTC B1304:68 or U3003:68 does not indicate a concern with the EPAS system. Is DTC B1304:68 or U3003:68 the only DTC present? Yes No Go to A2. Go to A4 .
  2. A2: FAULT CONDITION CONFIRMATION If DTC B1304:68 or U3003:68 is present and the steering assist is unaffected, the DTC may have been set due to the battery voltage dropping below the required parameters during engine cranking. Is the vehicle experiencing heavy steering or a lack of steering assist?
  3. A3: CHECK THE PSCM ELECTRICAL CONNECTOR Ignition OFF. PSCM_A connector disconnected. (C1463A) Inspect the connector for signs of water ingress, corrosion, pushed-out terminals or broken terminals. Is the PSCM electrical connector OK? Yes No Go to A4 REPAIR the connector or INSTALL a new connector as necessary.
  4. A4: 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.
  5. A5: CHECK THE CONDITION OF THE BATTERY Ignition OFF. REFER to «BATTERY, MOUNTING AND CABLES»(ref-574143) , Diagnosis and Testing, and implement Pinpoint Test A: Battery - Condition Test. Does the battery pass the condition test? Yes No Go to A6. INSTALL a new 12-volt battery. Refer to «BATTERY, MOUNTING AND CABLES»(ref-574143) . Clear the PSCM DTCs. REPEAT the self-test.
  6. A6: CHECK THE BATTERY STATE OF CHARGE Review the results from the battery condition test. Did the battery require a recharge?
  7. A7: 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?
  8. 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 PSCM DTCs. REPEAT the self-test. Go to A11 .
  9. A9: 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 A11 .
  10. A10: CHECK THE PSCM BATTERY VOLTAGE INPUT CIRCUIT FOR AN OPEN Ignition OFF. High-current Battery Junction Box connector disconnected. (C1617B) PSCM_A connector disconnected. (C1463A) Measure the resistance between: (+) High-current Battery Junction Box (C1617B) Connector, Harness Side (-) PSCM_A (C1463A) Connector, Harness Side B+ - SBF01 (RED) - Pin 1 B+ - SBF01 - Pin 2 Is the resistance less than 0.5 Ohm? Yes No Go to A13 . 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.
  11. A11: CHECK THE PSCM BATTERY VOLTAGE INPUT CIRCUIT FOR AN OPEN Ignition OFF. Disconnect the positive battery cable, refer to the «BATTERY, MOUNTING AND CABLES»(ref-574143) , Battery Disconnect. PSCM_A connector disconnected. (C1463A) Measure the resistance between: (+) Vehicle Battery (-) PSCM_A (C1463A) Connector, Harness Side Positive terminal B+ - SBF01 - Pin 2 Is the resistance less than 0.5 Ohm? Yes No Go to A13 . 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.
  12. A12: CHECK THE PSCM BATTERY VOLTAGE INPUT CIRCUIT FOR AN OPEN Ignition OFF. High-current Battery Junction Box connector disconnected. (C1617B) PSCM_A connector disconnected. (C1463A) Measure the resistance between: (+) High-current Battery Junction Box (C1617B) Connector, Harness Side (-) PSCM_A (C1463A) Connector, Harness Side B+ - SBF01 (RED) - Pin 1 B+ - SBF01 - Pin 2 Is the resistance less than 0.5 Ohm? Yes No Go to A13. REPAIR the open circuit. Clear the PSCM DTCs. REPEAT the self-test.
  13. A13: CHECK THE PSCM GROUND Inspect ground G105 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 PSCM monitors various inputs and outputs of the 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.

  1. B1: CHECK FOR PREVIOUSLY SET DTCS Go to «KNOWN CONCERNS»(ref-574128-S26368651652013082300000) . Check for DTCs listed in the section: System Related CMDTCs cleared since initial read. Are any of the following PSCM DTCs present? C1B00:2F, C1B00:62, C200B:29, C200B:2F, C200B:61, C200B:62, U2011:49, U2011:61, U2200:54, U3000:41, U3000:46, U3000:49 . Are any of the following PSCM DTCs present? C1B00:2F, C1B00:62, C200B:29, C200B:2F, C200B:61, C200B:62, U2011:61, U2200:54, U3000:49 . Yes No INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) . Go to B3 .
  2. B2: INSPECT EPAS GEAR WIRING HARNESS With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-574118) . 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.
  3. 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.

The PSCM monitors various inputs and outputs of the 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.

  1. C1: CHECK PSCM DTCS Review the returned PSCM DTCs. Is DTC U3000:96 present? Yes No INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) . Go to C3 .
  2. C2: VERIFY PRESENCE OF EPAS GEAR HEAT SHIELD Make sure the EPAS gear heat shield is present and installed correctly. Refer to «POWER STEERING»(ref-574132) . 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.
  3. 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.
  4. C4: CHECK FOR IPM-A DTCS Carry out the IPMA self-test. Are any DTCs present in the IPM-A? Yes No DIAGNOSE the IPM-A DTCs. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-574135) . Go to C5.
  5. C5: INSPECT THE PSCM CONNECTOR Ignition OFF. PSCM_B connector disconnected. (C1463B) Inspect the PSCM electrical connector for: corrosion damaged or bent pins pushed-out pins Is the connector undamaged and free from any corrosion? Yes No Go to C6. CLEAN, REPAIR or INSTALL a new connector or terminals as needed. Go to C6.
  6. C6: CHECK FOR RETURNING DTCS PSCM_B connector connected. (C1463B) Ignition ON, engine OFF. Clear the PSCM DTCs. Ignition OFF. Ignition ON, engine OFF. Test drive the vehicle for a minimum of 10 minutes. Carry out the PSCM self-test. Is DTC U3000:61 present? Yes No INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) . The condition to set the DTC is not present at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. RETURN the vehicle to the customer. For all other PSCM DTCs, REFER to the PSCM «DTC Index»(ref-574128-S09777978662013082300000) .

When the ignition is turned ON a relay inside the 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.

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.

  1. 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.
  2. 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.

The PSCM will use the motor inside the EPAS gear to calculate the relative and actual steering wheel angle, and then transmit this information to other modules over the HS-CAN.

  1. 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.
  2. E2: INSPECT THE INNER TIE RODS With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-574118) . 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 -- INNER»(ref-574132-S36318433422013082300000) Removal and Installation procedure. Inspect the inner tie rods for correct installation. Refer to «POWER STEERING»(ref-574132) . Are the inner tie rods correctly installed? Yes No INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) . INSTALL new inner tie rod(s), bellows boot(s) and clamps as necessary. REFER to «POWER STEERING»(ref-574132) .

The PSCM monitors various inputs and outputs of the 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.

  1. 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 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.
  2. F2: CHECK FOR UNLOADED STEERING RACK TRAVEL FEEL With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-574118) . 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.
  3. 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 EPAS gear. For complete information refer to the «TIE ROD -- INNER»(ref-574132-S36318433422013082300000) Removal and Installation procedure. Remove the outer tie rod and bellows boot. Refer to «POWER STEERING»(ref-574132) . 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 «POWER STEERING»(ref-574132) . ADJUST the front toe setting. REFER to «SUSPENSION SYSTEM - GENERAL INFORMATION»(ref-574122) . INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) .
  4. 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.

With a fully charged battery and the ignition ON, the 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 PSCM to protect the system from permanent damage.

  1. I1: CHECK CHARGING SYSTEM VOLTAGE Ignition ON, engine running. With the engine 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 A5 .
  2. I2: CHECK THE EPAS GEAR With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-574118) . 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.
  3. 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-574158-S28375504792013082300000) . DRIVE the vehicle to VERIFY the repair. Go to I4.
  4. 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 «POWER STEERING»(ref-574132) . 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-574158) Shaft. DRIVE the vehicle to VERIFY the repair.
  5. I5: CHECK THE STEERING GEAR With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-574118) . 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.
  6. 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. Binding steering column U-joints. Has a binding condition been identified? Yes No ISOLATE the component(s) causing the binding. INSTALL new component(s) as necessary. Go to I7.
  7. 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 «POWER STEERING»(ref-574132) . Disconnect the steering gear from the steering column. Check the steering gear for correct installation, tight spots and uneven operation. Has a binding condition been identified? Yes No INSTALL a new steering gear. REFER to «POWER STEERING»(ref-574132) . INSTALL a new EPAS assembly. REFER to «STEERING COLUMN»(ref-574158) removal and installation.

The tie rods connect the 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.

  1. 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-574118) . 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 -- INNER»(ref-574132-S36318433422013082300000) , Removal and Installation procedure. 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 «DIAGNOSIS AND TESTING»(ref-574121-S21438182762013082300000) - Wheels and Tires. INSTALL a new inner or outer tie rod as necessary. REFER to «TIE ROD -- INNER»(ref-574132-S36318433422013082300000) .

The 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.

  1. K1: 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 EPAS gear. For complete information refer to the «TIE ROD -- INNER»(ref-574132-S36318433422013082300000) Removal and Installation procedure. Remove the outer tie rod and bellows boot. Refer to «POWER STEERING»(ref-574132) . 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 «POWER STEERING»(ref-574132) . ADJUST the front toe setting. REFER to «SUSPENSION SYSTEM - GENERAL INFORMATION»(ref-574122) . INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) .

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.

  1. M1: CHECK FOR PREVIOUSLY SET DTCS Go to «KNOWN CONCERNS»(ref-574128-S26368651652013082300000) . Check for DTCs listed in the section: 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-574158) . Go to M2.
  2. 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-574158) . The condition to set the DTC is not present at this time. RETURN the vehicle to the customer.

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 SYSTEM WIRING DIAGRAMS .

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.

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

CircuitPin
B+ (Battery Positive Voltage) - SBF012(RED)

HARNESS SIDE

Scheme 2

Scheme 2
Scheme 2
CircuitPin

HARNESS SIDE

Scheme 3

Scheme 3
Scheme 3
CircuitPin
B+ (Battery Positive Voltage) - SBF011(RED)

HARNESS SIDE

  1. 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.
  2. N2: CHECK THE CONDITION OF THE BATTERY Ignition OFF. REFER to «BATTERY, MOUNTING AND CABLES»(ref-574143) , Diagnosis and Testing, and implement Pinpoint Test A: Battery - Condition Test. 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.
  3. 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»(ref-574126) to diagnose the battery and charging system. Go to N4.
  4. 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 N6 . REFER to «CHARGING SYSTEM»(ref-574126) to diagnose the battery and charging system.
  5. N5: CHECK THE MODULE SUPPLY VOLTAGE (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-574155) for additional information. CLEAR the DTCs. REPEAT the self-test. Go to N7 .
  6. N6: CHECK THE MODULE SUPPLY VOLTAGE (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 CLEAR the DTCs. REPEAT the self-test. Go to N8 .
  7. N7: 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 N9 . 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-574155) for additional information. CLEAR the DTCs. REPEAT the self-test. Blown fuse. INSTALL a new fuse. CLEAR the DTCs. REPEAT the self-test.
  8. N8: 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 N10 . Loose electrical connection. CLEAN and TIGHTEN the electrical connection. CLEAR the DTCs. REPEAT the self-test. Blown fuse. INSTALL a new fuse. CLEAR the DTCs. REPEAT the self-test.
  9. N9: 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-574155) for additional information. PSCM_A connector disconnected. (C1463A) High-current Battery Junction Box connector disconnected. (C1617B) Measure the resistance between: (+) High-current Battery Junction Box (C1617B) Connector, Harness Side (-) PSCM_A (C1463A) Connector, Harness Side B+ - SBF01 (RED) - Pin 1 B+ - SBF01 - Pin 2 Is the resistance less than 5 Ohm? Yes No Go to N11 . REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  10. N10: CHECK THE PSCM BATTERY VOLTAGE INPUT CIRCUIT FOR AN OPEN PSCM_A connector disconnected. (C1463A) High-current Battery Junction Box connector disconnected. (C1617B) Measure the resistance between: (+) High-current Battery Junction Box (C1617B) Connector, Harness Side (-) PSCM_A (C1463A) Connector, Harness Side B+ - SBF01 (RED) - Pin 1 B+ - SBF01 - Pin 2 Is the resistance less than 5 Ohm? Yes No Go to N12 . REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  11. N11: 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-574155) 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.
  12. N12: 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. 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.

  1. 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 scan tool 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 scan tool 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.

  1. 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 scan tool 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.

  1. 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-574118) . 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 -- INNER»(ref-574132-S36318433422013082300000) .
  2. 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 «DIAGNOSIS AND TESTING»(ref-574121-S21438182762013082300000) - Wheels and Tires.

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.

  1. 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 IDS 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 IDS 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.

  1. 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.
  2. U2: CHECK THE SASM FOR CORRECT INSTALLATION Check the SASM for correct installation. 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. VERIFY the SASM is installed correctly. REFER to «ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL»(ref-574142) .

The PSCM monitors various inputs and outputs of the 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.

  1. V1: 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 VC label. Is the air pressure in the tires correct as indicated on the VC label? Yes No Go to V2. ADJUST the air pressure in the tires. Go to V2.
  2. V2: CHECK FOR UNLOADED STEERING RACK TRAVEL FEEL With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-574118) . 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 V4 . Go to V3.
  3. V3: INSPECT THE INNER TIE RODS AND STEERING RACK FOR CORROSION Remove the outer tie rod and bellows boot. Refer to «POWER STEERING»(ref-574132) . 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 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 «POWER STEERING»(ref-574132) . ADJUST the front toe setting. REFER to «SUSPENSION SYSTEM - GENERAL INFORMATION»(ref-574122) . INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) .
  4. V4: 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.
  5. V5: CHECK FOR UNLOADED STEERING RACK TRAVEL FEEL With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-574118) . Ignition OFF. Disconnect the outer tie rods from the wheel knuckles. Refer to «POWER STEERING SYSTEM»(ref-574132) Tie Rod Removal and Installation. 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 The condition may be caused by tires, wheel knuckles, ball joints, struts or damaged sub-frame. ISOLATE the component(s) causing the binding. INSTALL new component(s) as necessary. DRIVE the vehicle to VERIFY the repair. Go to V6.
  6. V6: CHECK FOR UNLOADED STEERING COLUMN FEEL NOTE: Do not allow the steering column to rotate more than 1 complete revolution in each direction. If the steering column shaft is allowed to rotate more than 1 complete revolution in each direction damage to the clockspring may occur. Disconnect the steering column intermediate shaft from the EPAS gear. Discard the bolt. Rotate the steering wheel 1 complete revolution in each direction and inspect the steering column travel for the following: Abnormal noises Rough spots Sticky spots Tight spots Using a suitable steering wheel holding device, hold the steering wheel in the straight ahead position. Is steering column travel smooth and free of any abnormal noises, rough, sticky and tight spots? Yes No INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) . Go to V7.
  7. V7: INSPECT THE STEERING COLUMN SHAFT U-JOINTS NOTE: Do not allow the steering column to rotate while the steering column shaft is disconnected or damage to the clockspring may result. If there is evidence that the steering column shaft has rotated, the clockspring must be removed and re centered. For additional information, refer to «CLOCKSPRING»(ref-574155-S16002722772013082300000) , removal and installation. Inspect the steering column shaft U-joints for looseness or wear. Are the steering column shaft U-joints okay? Yes No CONNECT the steering column shaft to the EPAS gear. INSTALL a new bolt and tighten to 25 Nm (18 lb-ft). REFER to «SUSPENSION SYSTEM - GENERAL INFORMATION»(ref-574122) to diagnose further possible causes. INSTALL a new steering column shaft assembly. REFER to «STEERING COLUMN»(ref-574158) .

The PSCM monitors various inputs and outputs of the 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.

  1. W1: INSPECT EPAS GEAR WIRING HARNESS With the vehicle in NEUTRAL, position it on a hoist. Refer to «JACKING & LIFTING»(ref-574118) . Ignition OFF. Thoroughly inspect the steering torque sensor wire harness along the top of the EPAS gear for cuts, breaks and pinched wires. Disconnect the EPAS gear steering torque sensor electrical connector and inspect for corrosion, pushed-out pins, bent pins and spread terminals. Is the wire harness undamaged and is the steering torque sensor electrical connector in good condition? Yes No CONNECT the steering torque sensor electrical connector. Make sure it is fully seated and the CPA tab is fully engaged and locked. Go to W2. INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) .
  2. W2: TEST DRIVE TO CHECK FOR RETURNING DTCS Test drive the vehicle for 10 minutes. Carry out the PSCM self-test. Are any of the following DTCs present in the PSCM? C1B00:2F, C1B00:62, C200B:29 or U3000:49 . Yes No INSTALL a new EPAS gear. REFER to «POWER STEERING»(ref-574132) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. For all other PSCM DTCs, REFER to the PSCM «DTC Index»(ref-574128-S09777978662013082300000) .

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