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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 223 (RETAINED ACCESSORY POWER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC SYSTEM CHECK - RETAINED ACCESSORY POWERTEST DESCRIPTION
2001 Chevrolet Cavalier LS, 2.4 T

Test Description

2001 Chevrolet Cavalier LS, 2.4 TSECTION Test Description
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 3:  This step tests for valid system power moding in all ignition switch positions.
  3. 5:  The presence of diagnostic trouble codes (DTCs) which begin with "U" indicate some other module is not communicating. Diagnose these DTCs first.
Diagnostic System Check - Retained Accessory Power

Step Action Yes No
1 Install a scan tool.
Does the scan tool power up?		 Go to Step 2  Go to Scan Tool Does Not Power Up in Data Link Communications
2 
  1. Turn the ignition ON, with the engine OFF.
  2. Attempt to establish communication with the body control module (BCM).
Does the scan tool communicate with the BCM?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
3 
IMPORTANT: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.
  1. Access the Class 2 Power Mode parameter in the Diagnostic Circuit Check menu on the scan tool.
  2. Rotate the ignition switch through all positions while observing the Class 2 Power Mode parameter.
Does the Class 2 Power Mode parameter reading match the ignition switch position for all switch positions?		 Go to Step 4  Go to Power Mode Mismatch in Body Control System
4 Select the BCM display function on the scan tool.
Does the scan tool display any DTCs?		 Go to Step 5  Go to Symptoms - Retained Accessory Power 
5  Does the scan tool display any DTCs which begin with a "U"? Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications Go to Step 6 
6 Does the scan tool display any of the following DTCs?
  • B1000
  • B1001
  • B1372
  • B1382
  • B2965
 Go to Diagnostic Trouble Code (DTC) List in Body Control System Go to Step 7 
7 Select the powertrain control module (PCM) display function on the scan tool.
Does the scan tool display DTC P0562?		 Go to DTC P0562 in Engine Electrical Go to Symptoms - Retained Accessory Power 
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.