LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2007 >> Optra LT, Automatic >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Antilock Brake System >> Diagnostic Information and Procedures >> ABS Indicator Inoperative (North America) >> Test Description

Test Description

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

  1. 2:  This test verifies an inoperative lamp condition.
  2. 3:  This test checks for voltage on the lamp circuit.
  3. 4:  This begins a series of tests of the circuit from the indicator lamp to the EBCM and ground.
  4. 19:  This begins a series of tests of the voltage supply circuits that power the indicator lamp.
Step Action Values Yes No
Schematic Reference:  Antilock Brake System Schematics  
Connector End View Reference:  Antilock Brake System Connector End Views  
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Turn the ignition switch to LOCK.
  2. Disconnect the scan tool.
  3. Turn the ignition switch to ON.
  4. Observe the antilock brake system (ABS) indicator lamp.
Does the lamp illuminate for about 4 seconds, then turn OFF?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3  With the ignition still ON, observe the oil pressure lamp.
Is the oil pressure lamp illuminated?		 - Go to Step 4  Go to Step 19 
4 
  1. Turn the ignition switch to LOCK.
  2. Disconnect the connector from the electronic brake control module (EBCM).
  3. Turn the ignition switch to ON.
Does the ABS indicator illuminate?		 - Go to Step 5  Go to Step 8 
5
  1. Turn the ignition switch to LOCK.
  2. Test terminals 13 and 4 at the EBCM connector on both the ABS wiring harness and on the EBCM.
Is there a poor connection at any of these terminals?		 - Go to Step 6  Go to Step 7 
6 Repair the faulty terminals or replace the ABS unit as required.
Did you complete the repair?		 - Go to Step 30  -
7 Replace the EBCM.
Did you complete the replacement?		 - Go to Step 30  -
8
  1. Turn the ignition switch to LOCK.
  2. Disconnect the wire from the negative battery terminal.
  3. Measure the resistance between the negative battery wire, which is attached to ground, and the shorting bar in the EBCM connector.
Is the resistance equal to the specified value?		 0 Ω Go to Step 10  Go to Step 9 
9 Repair the open or high resistance in the circuit from the EBCM connector, terminal 13 to ground G106.
Did you complete the repair?		 - Go to Step 30  -
10
  1. Remove the instrument panel cluster (IPC).
  2. Remove and inspect the ABS indicator bulb.
Is the bulb burned out?		 - Go to Step 11  Go to Step 12 
11
  1. Replace the ABS indicator bulb.
  2. Install the IPC.
Did you complete the repair?		 - Go to Step 30  -
12 Test the continuity at the IPC connector terminal A13.
Does the ohmmeter show the specified value?		 0 Ω Go to Step 14  Go to Step 13 
13 Repair the contact at the IPC connector terminal A13.
Did you complete the repair?		 - System OK -
14 Inspect the wiring harnesses and the connectors in circuit L-GN/BK from the IPC terminal A13 to terminal 4 of the EBCM connector.
Does the ohmmeter show the specified value?		 ∞ Go to Step 15  Go to Step 16 
15 Repair the open or high resistance found.
Did you complete the repair?		 - Go to Step 30  -
16 Test for continuity between terminal 13 of the ABS connector and ground G106.
Is the ground connection equal to the specified value?		 0 Ω Go to Step 17  Go to Step 18 
17 Replace the EBCM.
Did you complete the replacement?		 - Go to Step 30  -
18 Repair the continuity problem between terminal 13 of the EBCM connector and ground G106.
Did you complete the repair?		 - Go to Step 30  -
19 
  1. Turn the ignition switch to LOCK.
  2. Inspect fuse F4 in the I/P fuse block.
Is the fuse open?		 - Go to Step 20  Go to Step 21 
20 Replace fuse F4.
Did you complete the replacement?		 - Go to Step 30  -
21 Inspect fuse EF5 in the engine fuse block.
Is the fuse open?		 - Go to Step 22  Go to Step 23 
22 Replace fuse EF5.
Did you complete the replacement?		 - Go to Step 30  -
23 Measure the voltage at terminal 2 of the ignition switch connector by backprobing.
Does the voltage measure within the specified range?		 11-14 V Go to Step 25  Go to Step 24 
24
  1. Inspect circuit RD between terminal 4 of C105 at the engine fuse block and terminal 2 of the ignition switch for continuity.
  2. Repair any open or high resistance found.
Did you find and correct the condition?		 - Go to Step 30  -
25
  1. Turn the ignition switch to ON.
  2. Backprobe terminal 4, PK, of the ignition switch connector.
Is the voltage within the specified range?		 11-14 V Go to Step 27  Go to Step 26 
26 Replace the ignition switch.
Did you complete the replacement?		 - Go to Step 30  -
27
  1. Turn the ignition switch to LOCK.
  2. Inspect circuit PK from terminal 4 of the ignition switch to fuse F4 in the I/P fuse block.
Does the ohmmeter show the specified value?		 ∞ Go to Step 28  Go to Step 29 
28 Repair the open or the high resistance.
Did you complete the repair?		 - Go to Step 30  -
29
  1. Remove the IPC.
  2. Inspect circuit PK from fuse F4 to terminal A19 of the IPC connector B.
  3. Repair any open or high resistance found in a wiring harness, splice pack, or connector.
Did you complete the repair?		 - Go to Step 30  -
30
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
scientia non olet · About LEMON Manuals