2004 Lexus LS 430
Mileage
253,146
Service Date
12/30/2021
Services Performed
- -TEST DROVE THE VEHICLE. IT FEELS EXTREMELY UNDERPOWERED AND THE TRANSMISSION IS SLAMMING INTO FIRST GEAR UPON DECELERATION. -ALMOST EVERY LIGHT IS ILLUMINATED ON THE DASH -CHECK ENGINE LIGHT ON, ABS LIGHT ON, CHECK VSC MESSAGE, TRAC OFF LIGHT ON, BRAKE WEAR MESSAGE, MAINTENANCE REQUIRED LIGHT ON, CHECK PMS SYSTEM MESSAGE AFS OFF LIGHT FLASHING. -SCANNED FOR CODES PCM: P0328 KNOCK SENSOR 1 CIRCUIT HIGH INPUT (BANK 1) ABS/VSC/TRC: C0200 RIGHT FRONT SPEED SENSOR CIRCUIT C1201 ENGINE CONTROL SYSTEM C1223 ABS CONTROL SYSTEM FAULT -CLEARED ALL CODES AND THEY RETURNED IMMEDIATELY. -INSPECTED ALL VISUAL WIRING FOR THE KNOCK SENSORS AND NO DAMAGE IS SEEN. -THE MAJORITY OF THE KNOCK SENSOR WIRING AND THE KNOCK SENSORS THEMSELVES ARE IN THE VALLEY OF THE MOTOR UNDER THE INTAKE MANIFOLD (CAN NOT BE SEEN OR TESTED WITH THE INTAKE MANIFOLD INSTALLED) *HAVE TO START WITH REMOVAL OF THE INTAKE MANIFOLD TO CONTINUE TESTING FOR THE KNOCK SENSOR CODES. **THE KNOCK SENSORS JOB IS TO DETECT DETONATION IN THE ENGINE, AND WHEN IT DOES, IS PULLS IGNITION TIMING WHICH CAN LEAD TO POOR ACCELERATION AND MAY CAUSE ERRATIC TRANSMISSION FUNCTION. WOULD HAVE TO CORRECT THE KNOCK SENSOR AND WHEEL SPEED SENSOR ISSUES FIRST AND RETEST FOR PROPER TRANSMISSION FUNCTION. -VISUALLY INSPECTED THE VISIBLE WIRING FOR THE RIGHT FRONT WHEEL SPEED SENSOR. NO DAMAGE IS SEEN. -TESTED THE RESISTANCE ACROSS THE WHEEL SPEED SENSOR AND IT WAS 1,187 OHMS (EXTREMELY HIGH) *RECOMMEND REPLACEMENT OF THE PASSENGER FRONT WHEEL SPEED SENSOR, CLEAR CODES AND RETEST. -FOR THE TPMS LIGHT, I BELIEVE THE SYSTEM IS A PASSIVE SYSTEM THAT WORKS OFF WHEEL SPEED. SO IF THERE IS A DEAD WHEEL SPEED SENSOR, THE SYSTEM IS NOT GOING TO WORK. -FOR THE BRAKE WEAR LIGHT, INSPECTED BOTH BRAKE WEAR SENSORS AND THEY WERE REUSED DURING THE LAST BRAKE JOB. BOTH THE FRONT AND REAR SENSOR ARE GROUND DOWN TO THE WIRE IN THE SENSOR, *RECOMMEND REPLACING THE FRONT AND REAR BRAKE PAD SENSORS AND RETEST.
- INTAKE MANIFOLD – Remove & Replace
- -FOUND ADDITIONAL DAMAGED WIRING BY THE BATTERY THAT HAD TO DEAL WIT SPEED SENSOR AND BRAKE PAD SENSORS AND THE ALARM (I BELIEVE). -REPAIRED WIRES AND TEST DROVE THE VEHICLE. -THE ONLY LIGHT REMAINING ON THE DASH IS THE MAINTENANCE REQUIRED LIGHT (DUE FOR AN OIL CHANGE) -THE VEHICLE FEELS LIKE IT HAS FULL ACCELERATION RETURNED BUT THERE IS STILL A HARSH DOWNSHIFT FROM 2-1 WHEN COMING TO A STOP. -RESET THE TRANSMISSION ADAPTATIONS AND RETESTED, IT IS SLIGHTLY BETTER BUT IT STILL HAS THE HARSH DOWNSHIFT (ALL OTHER SHIFTS FEEL TOTALLY NORMAL AND SMOOTH) -CHECKED TRANSMISSION FLUID LEVEL (OK). THERE WAS A BROKEN TOOL IN THE CHECK PLUG THAT HAD TO BE EXTRACTED. -THE FLUID CONDITION IS VERY DARK AND HAS A BURNT SMELL (NOT COMPLETELY UNEXPECTED FOR A TRANSMISSION WITH 250,000+ MILES ON IT). -CHECKED THROTTLE POSITION VOLTAGE TO VERIFY THAT THE THROTTLE BODY IS CLOSING COMPLETELY DURING DECELERATION AND IT IS. *SINCE THERE ARE NO CODES PRESENT AND NOTHING THAT IS STANDING OUT AS THE CULPRIT OF THE PROBLEM, IT ISN'T POSSIBLE TO ACCURATELY DIAGNOSE THE CAUSE OF THE HARSH DOWNSHIFT. **IT IS COMMON FOR AN INTERNAL PCM PROBLEM TO CAUSE THE SAME ISSUE BUT CAN NOT BE CERTAIN THAT IT WOULD FIX THE PROBLEM. THERE IS ALSO THE POSSIBILITY OF AN INTERNAL TRANSMISSION PROBLEM CAUSING IT BUT UNLESS IT GETS WORSE TO THE POINT THAT IT CAN GIVE CLUES TO WHICH IT IS, I CAN NOT SAY FOR CERTAIN IF ONE OR THE OTHER WOULD FIX THE PROBLEM.
- WHEEL SPEED SENSOR – Remove & Replace – Front,One Side
- BRAKE PAD WEAR SENSOR – Remove & Replace – Both,Front & Rear
JIBREEL S. gave our service a 5 star review on 12/30/2021
