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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 113 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS)SELF-DIAGNOSTIC SYSTEMON-BOARD DIAGNOSTICSNOTES
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F

On-Board Diagnostics: Notes

2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Notes
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For more information on PCM operation, see THEORY & OPERATION - 1.8L VIBE article.

The Powertrain Control Module (PCM) diagnoses any troubles which may occur in the engine control system when the ignition switch is in the ON position with the engine running. The PCM indicates a malfunction by illuminating the Malfunction Indicator Light (MIL) when a fault occurs in any of the following systems:

  • Heated Oxygen Sensor 1 (HO2S 1)
  • Heated Oxygen Sensor 2 (HO2S 2)
  • Engine Coolant Temperature (ECT) Sensor
  • Throttle Position (TP) Sensor (Including CTP Switch)
  • Vehicle Speed Sensor (VSS)
  • Intake Air Temperature (IAT) Sensor
  • Mass Air Flow (MAF) Sensor
  • Camshaft Position (CMP) Sensor
  • Crankshaft Position (CKP) Sensor
  • Knock Sensor (KS) System
  • Evaporative Emission (EVAP) Control System
  • Idle Air Control (IAC) System
  • CMP Actuator Solenoid System
  • Rocker Arm Oil Control system
  • Misfire Detection
  • Fuel-Trim
  • Catalyst Monitor
  • Central Processing Unit (CPU) Of The PCM

When PCM detects a malfunction in one of the above areas, PCM will illuminate or flash the MIL to notify driver of the occurrence of a fault. PCM will store a DTC when PCM illuminates the MIL. PCM will turn OFF the MIL after 3 consecutive ignition cycles without the malfunction occurring. DTC will remain stored in the PCM memory after the MIL is OFF.

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.