Circuit Description
DTC C1276 identifies a brake solenoid valve that cannot be energized. The malfunction may be caused by one of the following conditions:
| • | An open in the solenoid valve circuitry. |
| • | The solenoid valve is always energized due to a short to ground in the solenoid valve circuitry between the EBCM and the brake solenoid valve. |
An open will not allow proper ABS operation, but the short to ground simply turns ON the brake solenoid valve. A path for base brakes is still allowed once the motor rehomes and the check ball is lifted off its seat during key to ON initialization.
Conditions for Setting the DTC
DTC C1276 can set only when the brake solenoid valve is commanded off while the Electronic Brake Control Relay is enabled.
A malfunction exists if the EBCM detects the left front brake solenoid valve control circuit voltage is not within specifications.
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | The ABS disables. |
| • | The ABS warning indicator turns ON. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used. |
| • | 100 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition off. |
Diagnostic Aids
The following conditions may cause an intermittent malfunction:
| • | A poor connection |
| • | Rubbed-through wire insulation |
| • | A broken wire inside the insulation |
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction.
Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
| • | Backed out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal-to-wiring connections |
| • | Physical damage to the wiring harness |
Step | Action | Value(s) | Yes | No | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Important: Zero J 39200 test leads before making any resistance measurements. Refer to J 39200 user's manual. | ||||||||||||||||
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |||||||||||||
2 |
Is the resistance within the specified range? | OL (Infinite) | ||||||||||||||
3 |
Is the resistance within the specified range? | 0-2 ohms | ||||||||||||||
4 | Use the J 39200 in order to measure the resistance between the left front ABS brake solenoid valve connector terminal A and the left front brake solenoid valve connector terminal B. Is the resistance within the specified range? | 2-5 ohms | ||||||||||||||
5 | Use a J 39200 in order to measure the resistance between the Electronic Brake Control Relay harness connector terminal 87 and the left front brake solenoid valve connector terminal A. Is the resistance within the specified range? | 0-2 ohms | ||||||||||||||
6 |
Are terminal corrosion, damaged terminals, or poor terminal contact evident? | -- | ||||||||||||||
7 | Inspect CKT 826 for damage. Damage may cause a short to ground with all the connectors connected. Is there damage that may cause a short to ground with the connectors connected? | -- | ||||||||||||||
8 |
Do not start the engine. Does DTC C1276 set as a current DTC? | -- | ||||||||||||||
9 | Remove and inspect the ABS Mini Fuse (20 A). Is the fuse open? | -- | ||||||||||||||
10 | Use the J 39200 in order to measure the resistance between the Electronic Brake Control Relay harness connector terminal 87 and the EVO/ABS Mini Fuse (15A) terminal. Is the resistance within the specified range? | 0-2 ohms | ||||||||||||||
11 | Use the J 39200 in order to measure the resistance between the EVO/ABS Mini Fuse (15A) terminal and the left front brake solenoid valve harness connector terminal A. Is the resistance within the specified range? | 0-2 ohms | ||||||||||||||
12 |
Is the resistance within the specified range? | OL (Infinite) | ||||||||||||||
13 | Replace the EVO/ABS Mini Fuse (15A) with a known good Fuse (20A). Is the replacement complete? | -- | -- | |||||||||||||
14 | Repair the short to ground in CKT 826. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
15 | Repair the open or high resistance in CKT 826. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
16 | Replace the left front brake solenoid valve. Refer to Brake Solenoid Valve Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
17 | Replace all the terminals and connectors that exhibit the following conditions:
Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
18 | Repair the damage to CKT 826. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
19 | Replace the fuse block EVO/ABS Mini Fuse (15A). Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
20 | Repair the open or high resistance in CKT 1633. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
21 | Repair the open or high resistance in CKT 855. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
22 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
23 | The malfunction is intermittent or not present at this time. Refer to Diagnostic Aids for more information. Is the repair complete? | -- | Go to Diagnostic System Check | -- | ||||||||||||
