my 2002 chevy tahoe abs light and brake light are on i already change the brake pads for all four wheels including emergency brakes.lights are off but they turn on after a small drive.
Year : 2002
Make : Chevrolet
Model : tahoe
Engine : 5.3 ltr
I CHANGE THE BRAKE PADS I DID A BRAKE FLUID FLUSH. THE COMPUTER READS C0265 EBCM RELAY CIRCUIT.
can you look in the glove box on the build sticker andd see if it says JL4 on the sticker
NO IT DOES NOT SAY JL4 ON THE STICKER
okTest 6-11 Circuit Description The ABS relay supplies battery voltage to six valve solenoids. The EBCM microprocessor applies the grounds needed to activate each solenoid. The low side of each solenoid coil has a feedback circuit to the EBCM microprocessor. When a solenoid is commanded OFF, the feedback voltage is high. When a solenoid is commanded ON, the feedback voltage is low. Conditions for Running the DTC
Conditions for Setting the DTC The EBCM detects an internal malfunction. Action Taken When the DTC Sets C0265 If equipped, the following actions occur:
C0266 If equipped, the following actions occur:
Conditions for Clearing the DTC The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function. Diagnostic Aids Important: Whenever the EBCM is replaced for DTC C0265 or C0266, the ABS pump motor and motor circuitry must be tested for the proper resistance. Refer to steps 7 and 8 in the diagnostic table below for testing procedures and resistance values. C0265 Thoroughly inspect connections and circuitry that may cause an intermittent malfunction. C0266 Replace the EBCM if DTC C0266 continues to set intermittently. Test Description The numbers below refer to the step numbers on the diagnostic table.
Attachments are only available to registered users.
WHERE IS THE EBCM RELAY LOCATED?
actually i almost forgot here is a service bulletin on this
Bulletin No.: 04-05-25-002E
Date: March 11, 2009
This bulletin is being revised to add step 2 to the procedure and update the Parts and Warranty Information. Please discard Corporate Bulletin Number 04-05-25-002D (Section 05 - Brakes).
Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module.
A poor connection at the EBCM ground is causing unnecessary replacement of brake modules.
Perform the following steps to improve the connection of the EBCM Ground:
1. Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire.
2. If the original fastener has a welded on nut, remove the nut from the frame, and if required, enlarge the bolt hole to accommodate the new bolt and nut.
3. Clean the area, front and back, using a tool such as a *3M(TM) Scotch-Brite Roloc disc or equivalent.
4. Install the ground, then the washer and then the bolt to the frame.
5. Install a washer and nut to the back side of the frame.
Tighten the nut to 9 Nm (79 lb in).
6. Cover the front and back side of the repair area using Rubberized Undercoating.
An additional check can be made to ensure a good connection for the battery cable to frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above.
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