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HOMESERVICE MANUALSCHEVROLET2001IMPALA POLICEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.8LDIAGNOSTIC TESTSDTC P1670: OUTPUT DRIVER MODULE CIRCUIT NO. 4DIAGNOSTIC PROCEDURES
2001 Chevrolet Impala Police

Diagnostic Procedures

2001 Chevrolet Impala PoliceSECTION Diagnostic Procedures
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK . After performing powertrain diagnostic system check, go to next step.
  2. If DTC P0560 is set, see DTC P0560: SYSTEM VOLTAGE . If DTC P0560 is not set, go to next step.
  3. Using scan tool, select OUTPUT DRIVER DATA list. Observe parameters on scan tool. If any parameters indicate a fault present, go to next step. If no parameters indicate a fault, go to step  5.
  4. Check for short to voltage on control circuit of component that indicated a fault. If problem was found, repair as necessary. After repairs, go to step  6. If problem was not found, go to next step.
  5. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  6. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  7. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.