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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0608: Vehicle Speed Output Circuit ("Y" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
    CAUTION: Support lower control arms so drive axles are in normal horizontal position, or drive axles will be damaged.
  2. Turn ignition off. Raise and support drive wheels. Start engine. Disable ASR/TCS systems (if equipped). Place gear selector into gear. If speedometer indicates any speed, see DIAGNOSTIC AIDS . If speedometer does not indicate any speed, go to next step.
  3. Install Signal Generator Tester (J-33431-B) between ground and PCM harness connector, VSS output circuit. Turn ignition on. Turn tester on and set to generate a vehicle speed signal. If speedometer indicates any speed, go to next step. If speedometer does not indicate any vehicle speed, check and repair circuits and connectors between PCM, electronic suspension control module (if equipped) and instrument cluster. If circuits and connections are okay, replace instrument cluster.
  4. Check for poor connections/terminal tension at PCM connector. Repair as necessary. After repairs, go to step  6. If connection or terminal tension is okay, go to next step.
  5. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  6. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  7. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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