Circuit Description
Voltage is applied to the normally open inlet valves whenever the main relay is energized.
An inlet valve closes when the EBCM/EBTCM supplies a ground path at the inlet valve control terminal.
The EBCM/EBTCM closes an inlet valve for short periods in order to maintain (hold) or reduce pressure at the left rear wheel.
Conditions for Setting the DTC
The DTC C1255 sets when the EBCM/EBTCM detects an open or short to ground in the left rear inlet valve circuit.
Action Taken When the DTC Sets
The following actions are taken when the DTC sets:
| • | A malfunction DTC is stored. |
| • | The ABS is disabled. |
| • | The ANTILOCK indicator lamp is turned ON. |
Conditions for Clearing the DTC
The DTC will clear under following conditions:
| • | Conditions for the malfunction are no longer present. Use the scan tool Clear DTCs function. |
| • | 100 ignition switch key cycles have passed without detecting any malfunctions. |
Diagnostic Aids
Perform a thorough inspection of the wiring and the connectors.
Failure to inspect wiring carefully may result in a misdiagnosis. A misdiagnosis may result in replacing parts without repairing the malfunction.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
2 |
Is the resistance less than the specified value? | 2 ohms | ||
3 | Measure the resistance between the BPMV connector C1 terminal 14 and the BPMV assembly block. Is the resistance equal to the specified value? | OL (Infinite) | ||
4 | Measure the resistance between the BPMV connector C1 terminal 14 and terminal 9. Is the resistance within the specified range? | 5-8 ohms | ||
5 |
Is the resistance less than the specified value? | 2 ohms | ||
6 |
Is the resistance less than the specified value? | 2 ohms | ||
7 |
Is the resistance equal to the specified value? | OL (Infinite) | ||
8 |
Is the voltage greater than the specified value? | 1 V | ||
9 | Repair the open or high resistance in CKT 1290. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
10 | Repair the open or high resistance in CKT 1451. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
11 | Repair the short to ground in CKT 1290. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
12 | Repair the short to voltage in CKT 1290. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
13 | Replace the BPMV. Refer to Brake Pressure Modulator Valve Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- |
14 | Replace the EBCM/EBTCM. Refer to Electronic Brake and Traction Control Module Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- |
