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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Corvette 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C1261 LF Inlet Valve Solenoid Malfunction

Object Number: 568096 Size: SF
ABS Components
Antilock Brake System Schematics

Circuit Description

This DTC identifies a malfunction within the EBCM.

Conditions for Setting the DTC
    • DTC C1256xx can be set when there is a solenoid short to battery inside the BPMV. If DTCs C1261 - C1274 are set along with C1256xx then pursue the solenoid DTCs first.
    • DTC C1256xx can be set when there is an internal EBCM malfunction.

Action Taken When the DTC Sets

A malfunction DTC is stored, ABS/TCS/Active Handling (RPO JL4) are not disabled and the ABS and Car Icon (TCS indicator) are not turned on.

Conditions for Clearing the DTC
    • Condition for DTC is no longer present and scan tool clear DTC function is used.
    • Fifty ignition cycles have passed with no DTCs detected.

Diagnostic Aids
    • When DTC C1256xx is displayed on the Scan Tool, it will be followed by two more numbers which should be noted along with any other DTCs that may be displayed. The additional two numbers displayed with DTC C1256xx are for aiding engineering to determine the cause of the internal malfunction.
    • Make sure the integrity of the connection between the EBCM and the BPMV is secure, tight, and free from corrosion.

Test Description

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

  1. Checks the resistance value of the solenoid.

    2.

  2. Checks for a short to ground in the BPMV.

    3.

  3. Checks for an internal short to voltage.

DTC C1261 LF Inlet Valve Solenoid Malfunction

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the EBCM connector.
  3. Remove the EBCM from the BPMV.
  4. Inspect the EBCM to BPMV connector for conditions which could cause intermittents such as damage, corrosion, or poor terminal contact.

Are internal connectors OK and cavity free of brake fluid?

--

Go to Step 3

Go to Step 6

3

  1. Install J 41247 BPMV Pinout Box to the BPMV connector.
  2. Using J 39200 DMM, measure the resistance between J 41247 terminals 14 and 7.

Is the resistance within the range specified in the value(s) column?

8-12 ohms

Go to Step 4

Go to Step 8

4

Using J 39200 DMM, measure the resistance between J 41247 terminal 14 and the BPMV case.

Is the resistance within the range specified in the value(s) column?

OL (infinite)

Go to Step 5

Go to Step 8

5
  1. Remove J 41247 .
  2. Reinstall the EBCM to BPMV.
  3. Reconnect the EBCM connector.
  4. Turn the ignition switch to the ON position, engine off.

Does DTC C1261 reset as a current DTC?

--

Go to Step 9

Go to Step 7

6
  1. If connector corrosion or damage are present, replace BPMV and/or EBCM as necessary.
  2. If brake fluid is present, replace both the BPMV and EBCM.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

--

7

Using a scan tool in ABS/TCS or ABS/TCS/Active Handling Special Functions run the AUTOMATED Test.

Does DTC C1261 reset as a current DTC?

--

Go to Step 8

Go to Diagnostic System Check - ABS

8

Replace the BPMV. Refer to Brake Pressure Modulator Valve Replacement .

Is the replacement complete?

--

Go to Diagnostic System Check - ABS

--

9

Replace the EBCM. Refer to Electronic Brake Control Module Replacement .

Is the replacement complete?

--

Go to Diagnostic System Check - ABS

--