Diagnostic Routine AD
Diagnostic Routine AD
Diagnostic Overview
U3003:62 - SASM
Refer to Wiring Diagram Set 31 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
The SASM (Steering Angle Sensor Module) receives battery voltage from the BCM (Body Control Module) and has a single ground circuit located in the instrument panel wiring harness. Excessive resistance or an open in one or both of these circuits, a discharged battery, an inoperative charging system or an overcharging condition in the charging system results in the SASM (Steering Angle Sensor Module) setting a DTC (Diagnostic Trouble Code).
This DTC (Diagnostic Trouble Code) may also set in the SASM (Steering Angle Sensor Module) module due to battery charging or vehicle jump starting events.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminates.
- Make sure the vehicle battery terminals are tightened to their correct torque specifications.
- Make sure BCM (Body Control Module) fuse 72 (7.5A) is OK.
Pinpoint Test
1. CHECK FOR CHARGING SYSTEM DTCs (Diagnostic Trouble Codes) IN THE PCM
1. Ignition ON.
2. Using a scan tool, retrieveALL CMDTCs (Continuous Memory Diagnostic Trouble Codes).
Is DTC (Diagnostic Trouble Code) B1317, B1318, B1676, U3003:16 or U3003:17 present in one or more modulesAND are any charging system DTCs (Diagnostic Trouble Codes) present in the PCM (Powertrain Control Module)?
2. CHECK THE BATTERY CONDITION AND STATE OF CHARGE
1. Ignition OFF.
2. Carry out the Battery Condition Test. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.
Did the battery pass the condition test?
3. CHECK THE CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine speed to increase above 2,000 RPM (Revolutions Per Minute) while performing this step or the generator may self-excite and result in default charging system output voltage. If engine speed goes above 2,000 RPM (Revolutions Per Minute), turn the vehicle off and restart the engine before performing this step.
1. Start the engine.
2. Measure the voltage of the battery with and without a load on the charging system as follows:
3. Turn off all accessories and run the engine at 1,500 RPM (Revolutions Per Minute) for a minimum of 2 minutes while measuring the battery voltage.
4. Turn on headlights and HVAC (Heating, Ventilation, and Air Conditioning) fan on high and run the engine at 1,500 RPM (Revolutions Per Minute) for a minimum of 2 minutes while measuring the battery voltage.
Is the voltage between 13 and 15.2 volts?
4. CHECK THE SASM (Steering Angle Sensor Module) BATTERY VOLTAGE STATUS (VBATT_Status) PID (Parameter Identification)
1. Ignition OFF.
2. Ignition ON.
3. Measure and record the voltage at the battery.
4. Using a scan tool, monitor the VBATT_Status PID (Parameter Identification).
Is the PID (Parameter Identification) display within 0.2 volt of the recorded battery voltage?
5. CHECK THE VOLTAGE SUPPLY TO THE SASM (Steering Angle Sensor Module)
1. Ignition OFF.
2. Disconnect SASM (Steering Angle Sensor Module) C226A.
3. Measure:
Is the voltage within 0.2 volt of the recorded battery voltage?
6. CHECK THE SASM (Steering Angle Sensor Module) GROUND CIRCUIT FOR AN OPEN
1. Measure:
Is the resistance less than 3 ohms?
7. CHECK FOR CORRECT SASM (Steering Angle Sensor Module) OPERATION
1. Ignition OFF.
2. Disconnect and inspect all SASM (Steering Angle Sensor Module) electrical connectors.
3. Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
4. Connect the SASM (Steering Angle Sensor Module) electrical connectors. Make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
