2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 993
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 1 ohm between the ground circuits listed below and ground.
* Terminal 13
* Terminal 38
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground.
* Terminal 1
* Terminal 25
瀚慖f the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM replacement, setup, and programming
C123D
DTC C056D, C120C, C121C, C121E, C121F, C123A-C1256, C126E-C127C, C12C2-C12DB, C12DE, C12DF, or C12F2-C12F6
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provide an overview of each diagnostic category.
DTC Descriptors
DTC C056D 00
- ECU Hardware Performance
DTC C056D 3C
- ECU Hardware Performance Internal Communications Failure
DTC C056D 59
- ECU Hardware Performance
DTC C120C
- Brake Pedal Position Sensor 4 Plausibility
DTC C121C
- EBCM Internal Communication Error
DTC C121E
- EBCM Unimplemented Interrupt
DTC C121F
- EBCM Unexpected Exception
DTC C123A
- EBCM High End Timer Watchdog
DTC C123B
- EBCM High End Timer Program Overflow
DTC C123C
- EBCM High End Timer RAM Fault
Showing posts with label disconnect the harness connector at the EBCM.. Show all posts
Showing posts with label disconnect the harness connector at the EBCM.. Show all posts
Thursday, December 19, 2019
Sunday, November 17, 2019
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 836
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 836
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the 12 V reference circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 28
* Right Front Sensor circuit terminal 17
* Left Rear Sensor circuit terminal 4
* Right Rear Sensor circuit terminal 3
瀚慖f greater than the specified value, test the 12 V reference circuit for a short to voltage.
3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 29
* Right Front Sensor circuit terminal 6
* Left Rear Sensor circuit terminal 5
* Right Rear Sensor circuit terminal 2
瀚慖f greater than the specified value, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the 12 V reference terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 28
* Right Front Sensor circuit terminal 17
* Left Rear Sensor circuit terminal 4
* Right Rear Sensor circuit terminal 3
瀚慖f less than the specified value, test the 12 V reference circuit for a short to ground.
5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 29
* Right Front Sensor circuit terminal 6
* Left Rear Sensor circuit terminal 5
* Right Rear Sensor circuit terminal 2
瀚慖f less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Test for less than 2 ohm between the appropriate 12 V reference circuit terminals listed below.
* Left Front Sensor circuit terminals 28 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Right Front Sensor circuit terminals 17 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Left Rear Sensor circuit terminals 4 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
* Right Rear Sensor circuit terminals 3 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
瀚慖f greater than the specified value, test the 12 V reference circuit for an open or high resistance.
8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.
* Left Front Sensor circuit terminals 29 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Right Front Sensor circuit terminals 6 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Left Rear Sensor circuit terminals 5 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
* Right Rear Sensor circuit terminals 2 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
瀚慖f greater than the specified value, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement
* Rear Wheel Speed Sensor Replacement
* Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM replacement, setup, and programming
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the 12 V reference circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 28
* Right Front Sensor circuit terminal 17
* Left Rear Sensor circuit terminal 4
* Right Rear Sensor circuit terminal 3
瀚慖f greater than the specified value, test the 12 V reference circuit for a short to voltage.
3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 29
* Right Front Sensor circuit terminal 6
* Left Rear Sensor circuit terminal 5
* Right Rear Sensor circuit terminal 2
瀚慖f greater than the specified value, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the 12 V reference terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 28
* Right Front Sensor circuit terminal 17
* Left Rear Sensor circuit terminal 4
* Right Rear Sensor circuit terminal 3
瀚慖f less than the specified value, test the 12 V reference circuit for a short to ground.
5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 29
* Right Front Sensor circuit terminal 6
* Left Rear Sensor circuit terminal 5
* Right Rear Sensor circuit terminal 2
瀚慖f less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Test for less than 2 ohm between the appropriate 12 V reference circuit terminals listed below.
* Left Front Sensor circuit terminals 28 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Right Front Sensor circuit terminals 17 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Left Rear Sensor circuit terminals 4 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
* Right Rear Sensor circuit terminals 3 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
瀚慖f greater than the specified value, test the 12 V reference circuit for an open or high resistance.
8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.
* Left Front Sensor circuit terminals 29 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Right Front Sensor circuit terminals 6 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Left Rear Sensor circuit terminals 5 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
* Right Rear Sensor circuit terminals 2 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
瀚慖f greater than the specified value, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement
* Rear Wheel Speed Sensor Replacement
* Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM replacement, setup, and programming
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 821
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 821
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the 12 V reference circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 28
* Right Front Sensor circuit terminal 17
* Left Rear Sensor circuit terminal 4
* Right Rear Sensor circuit terminal 3
瀚慖f greater than the specified value, test the 12 V reference circuit for a short to voltage.
3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 29
* Right Front Sensor circuit terminal 6
* Left Rear Sensor circuit terminal 5
* Right Rear Sensor circuit terminal 2
瀚慖f greater than the specified value, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the 12 V reference terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 28
* Right Front Sensor circuit terminal 17
* Left Rear Sensor circuit terminal 4
* Right Rear Sensor circuit terminal 3
瀚慖f less than the specified value, test the 12 V reference circuit for a short to ground.
5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 29
* Right Front Sensor circuit terminal 6
* Left Rear Sensor circuit terminal 5
* Right Rear Sensor circuit terminal 2
瀚慖f less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Test for less than 2 ohm between the appropriate 12 V reference circuit terminals listed below.
* Left Front Sensor circuit terminals 28 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Right Front Sensor circuit terminals 17 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Left Rear Sensor circuit terminals 4 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
* Right Rear Sensor circuit terminals 3 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
瀚慖f greater than the specified value, test the 12 V reference circuit for an open or high resistance.
8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.
* Left Front Sensor circuit terminals 29 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Right Front Sensor circuit terminals 6 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Left Rear Sensor circuit terminals 5 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
* Right Rear Sensor circuit terminals 2 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
瀚慖f greater than the specified value, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement
* Rear Wheel Speed Sensor Replacement
* Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM replacement, setup, and programming
Antilock Brake System - Non-Hybrid Less than 3900 kg (8600 lb) GVW
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the 12 V reference circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 28
* Right Front Sensor circuit terminal 17
* Left Rear Sensor circuit terminal 4
* Right Rear Sensor circuit terminal 3
瀚慖f greater than the specified value, test the 12 V reference circuit for a short to voltage.
3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 29
* Right Front Sensor circuit terminal 6
* Left Rear Sensor circuit terminal 5
* Right Rear Sensor circuit terminal 2
瀚慖f greater than the specified value, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the 12 V reference terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 28
* Right Front Sensor circuit terminal 17
* Left Rear Sensor circuit terminal 4
* Right Rear Sensor circuit terminal 3
瀚慖f less than the specified value, test the 12 V reference circuit for a short to ground.
5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground.
* Left Front Sensor circuit terminal 29
* Right Front Sensor circuit terminal 6
* Left Rear Sensor circuit terminal 5
* Right Rear Sensor circuit terminal 2
瀚慖f less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Test for less than 2 ohm between the appropriate 12 V reference circuit terminals listed below.
* Left Front Sensor circuit terminals 28 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Right Front Sensor circuit terminals 17 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Left Rear Sensor circuit terminals 4 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
* Right Rear Sensor circuit terminals 3 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
瀚慖f greater than the specified value, test the 12 V reference circuit for an open or high resistance.
8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.
* Left Front Sensor circuit terminals 29 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Right Front Sensor circuit terminals 6 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Left Rear Sensor circuit terminals 5 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
* Right Rear Sensor circuit terminals 2 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
瀚慖f greater than the specified value, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement
* Rear Wheel Speed Sensor Replacement
* Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM replacement, setup, and programming
Antilock Brake System - Non-Hybrid Less than 3900 kg (8600 lb) GVW
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