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Home >> Chevrolet >> 2001 >> Impala Base, 3.8 K >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Anti-Lock Brake System With Traction Control System - BOSCH 5.3) >> Diagnostic Tests >> DTC C0266: Ads Controller Malfunction (CAMARO & Firebird) >> Diagnosis

DTC C0266: Ads Controller Malfunction (CAMARO & Firebird): Diagnosis

WARNING: This page is about a different car, the 2001 Pontiac Grand Prix, 2001 Pontiac Firebird, 2001 Oldsmobile Intrigue, and 2001 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. Go to next step.
  2. Turn ignition off. Disconnect and check Accelerator and Servo control Module (ASM) and connector for corrosion or damage. If connector is faulty, go to step  7 . If connector is okay, go to next step.
  3. Measure resistance between ASM connector terminal No. 28 (Black/White wire) and ground. If resistance is 0-5 ohms, go to next step. If resistance is not 0-5 ohms, go to step  8 .
  4. Measure resistance between ASM connector terminal No. 55 (Black/White wire) and ground. If resistance is 0-5 ohms, go to next step. If resistance is not 0-5 ohms, go to step  8 .
  5. Turn ignition on, engine off. Using DVOM, measure voltage between ASM harness connector terminals No. 1 (Pink wire) and No. 28 (Black/White wire). If voltage is equal to battery voltage, go to step  10 . If voltage is not equal to battery voltage, go to next step.
  6. Repair open or high resistance in Pink wire between ASM and engine wiring harness junction block 2. After repairs, go to step  16 .
  7. Repair ASM connector as necessary. After repairs, go to step  16 .
  8. Repair open or high resistance in Black/White wire between ASM and ground. After repairs, go to step  16 .
  9. Replace ASM. See ACCELERATOR & SERVO CONTROL MODULE (CAMARO & FIREBIRD)  under REMOVAL & INSTALLATION. After repairs, go to step  16 .
  10. Turn ignition off. Disconnect EBCM connector. Install Universal Pinout Box (J 39700) using Cable Adapter (J 39700-25) to EBCM harness connector only. Measure resistance between terminals No. 9 (Tan/Black wire) and No. 15 (Black wire). If resistance is infinite, go to step  12 . If resistance is not infinite, go to next step.
  11. Repair short to ground in Tan/Black wire between ASM and EBCM. After repairs, go to step  16 .
  12. Measure resistance between universal pinout box terminal No. 9 (Tan/Black wire) and ASM connector terminal No. 35 (Tan/Black wire). If resistance is 0-5 ohms, go to step  14 . If resistance is not 0-5 ohms, go to next step.
  13. Repair open or high resistance in Tan/Black wire between ASM and EBCM. After repairs, go to step  16 .
  14. Turn ignition on, engine off. Using DVOM, measure voltage at universal pinout box terminal No. 9 (Tan/Black wire). If voltage is greater than one volt, go to next step. If voltage is not greater than one volt, go to step  9 .
  15. Repair short to voltage in Tan/Black wire between ASM and EBCM. After repairs, go to next step.
  16. Using scan tool, clear DTCs. Operate vehicle. If DTC does not reset, system is okay.
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