DTC C0265 or C0266 and C065 C066 EBCM Relay Circuit P32
Circuit Description
The pump motor relay supplies power to all six solenoid coils (three isolation solenoid coils and three dump solenoid coils) and the motor when the ABS is required. The relay and the six solenoid coils are located within the EBCM.
Conditions for Setting the DTC (DTC C0265)
| • | The EBCM microprocessor commands the relay on |
| • | Low voltage exists on all six solenoid driver circuits when high voltage is expected (the solenoid is not energized) |
Conditions for Setting the DTC (DTC C0266)
| • | The ABS bulb check is complete |
| • | High voltage exists on the pump motor driver circuit when all are expected to be low (the relay is not commanded on) |
Action Taken When the DTC Sets
| • | The ABS indicator lamp turns on |
| • | The ABS disables |
DTCs C0265 and C0266 are Ignition Latched DTCs, which indicates that the above actions remain true until the ignition is turned to OFF (even if the cause of the DTC is intermittent).
Conditions for Clearing the DTC
| • | Repair the conditions responsible for setting the DTC |
| • | Use the Scan Tool Clear DTCs function |
Diagnostic Aids (DTC C0265)
DTC C0265 usually sets because of an open relay coil or non-closable relay contacts. The relay is located within the EBCM. The relay is not serviceable. If the test does not repair the DTC, then replace the EBCM.
If DTC C0265 appears with other DTCs repair the other DTCs first. Clear all DTCs. Then run three function tests with the Scan Tool . Refer to this diagnostic chart if DTC C0265 resets.
Diagnostic Aids (DTC C0266)
DTC C0266 usually sets when the relay contacts are stuck closed. The relay is located within the EBCM. The relay is not serviceable. If the test does not repair the DTC, then replace the EBCM.
If DTCs C0265 or C0266 are setting after replacing the EBCM, check the vehicle for an auxiliary device (winch, auxiliary battery system, etc.) which could cause a voltage spike on the battery feed to the EBCM. If the vehicle does have an auxiliary device, install a Metallic Oxide Varistor (MOV) in the battery feed circuit to the EBCM.
Test Description
The numbers below refer to the steps in the diagnostic table:
-
This step determines the resistance of the power ground circuit.
-
This step determines the battery voltage available to the EBCM.
-
This step determines the resistance of the signal ground circuit.
-
This step determines the ignition voltage available to the EBCM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Is the connector in good condition? | -- | Go to Step 3 | Go to Step 11 |
Using a J 39200 , measure the resistance between terminal B of the 2-way EBCM harness connector and the ground . Is the resistance measurement within the specified range? | 0-2 ohms | Go to Step 4 | Go to Step 12 | |
Using a J 39200 , measure the voltage between terminal A of the 2-way EBCM harness connector and the ground . Is the voltage equal to or greater than the specified value? | 10.0 V | Go to Step 6 | Go to Step 5 | |
5 | Inspect the grey fusible link. Is the grey fusible link open? | -- | Go to Step 13 | Go to Step 14 |
6 |
Is the connector in good condition? | -- | Go to Step 7 | Go to Step 15 |
Measure the resistance between terminal J of the 10-way EBCM harness connector and the ground using a J 39200 . Is the resistance measurement within the specified range? | 0-2 ohms | Go to Step 8 | Go to Step 16 | |
Is the voltage equal to or greater than the specified value? | 10.0 V | Go to Step 10 | Go to Step 9 | |
9 | Inspect the 15-amp I-3 fuse. Is the fuse open? | -- | Go to Step 17 | Go to Step 18 |
10 | Malfunction is intermittent, perform the following:
Does the DTC set as a current DTC? | -- | Go to Step 19 | Go to Diagnostic Aids |
11 | Repair the 2-way EBCM harness connector. Refer to Connector Repairs . Is the repair complete? | -- | -- | |
12 | Repair the open or the high resistance in the CKT 350. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
13 | Repair the short to ground in the CKT 442. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
14 | Repair the open or the high resistance in the CKT 442. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
15 | Repair the 10-way EBCM harness connector. Refer to Connector Repairs . Is the repair complete? | -- | -- | |
16 | Repair the open or the high resistance in the CKT 451. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
17 | Repair the short to ground in the CKT 241. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
18 | Repair the open or the high resistance in the CKT 241. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
19 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- |
DTC C0265 or C0266 and C065 C066 EBCM Relay Circuit P42
Circuit Description
The pump motor relay supplies power to all six solenoid coils (three isolation solenoid coils and three dump solenoid coils) and the motor when the ABS is required. The relay and the six solenoid coils are located within the EBCM.
Conditions for Setting the DTC (DTC C0265)
| • | The EBCM microprocessor commands the relay on |
| • | Low voltage exists on all six solenoid driver circuits when high voltage is expected (the solenoid is not energized) |
Conditions for Setting the DTC (DTC C0266)
| • | The ABS bulb check is complete |
| • | High voltage exists on the pump motor driver circuit when all are expected to be low (the relay is not commanded on) |
Action Taken When the DTC Sets
| • | The ABS indicator lamp turns on |
| • | The ABS disables |
DTCs C0265 and C0266 are Ignition Latched DTCs, which indicates that the above actions remain true until the ignition is turned to OFF (even if the cause of the DTC is intermittent).
Conditions for Clearing the DTC
| • | Repair the conditions responsible for setting the DTC |
| • | Use the Scan Tool Clear DTCs function |
Diagnostic Aids (DTC C0265)
DTC C0265 usually sets because of an open relay coil or non-closable relay contacts. The relay is located within the EBCM. The relay is not serviceable. If the test does not repair the DTC, then replace the EBCM.
If DTC C0265 appears with other DTCs repair the other DTCs first. Clear all DTCs. Then run three function tests with the Scan Tool . Refer to this diagnostic chart if DTC C0265 resets.
Diagnostic Aids (DTC C0266)
DTC C0266 usually sets when the relay contacts are stuck closed. The relay is located within the EBCM. The relay is not serviceable. If the test does not repair the DTC, then replace the EBCM.
If DTCs C0265 or C0266 are setting after replacing the EBCM, check the vehicle for an auxiliary device (winch, auxiliary battery system, etc.) which could cause a voltage spike on the battery feed to the EBCM. If the vehicle does have an auxiliary device, install a Metallic Oxide Varistor (MOV) in the battery feed circuit to the EBCM.
Test Description
The numbers below refer to the steps in the diagnostic table:
-
This step determines the resistance of the power ground circuit.
-
This step determines the battery voltage available to the EBCM.
-
This step determines the resistance of the signal ground circuit.
-
This step determines the ignition voltage available to the EBCM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Is the connector in good condition? | -- | Go to Step 3 | Go to Step 11 |
Using a J 39200 , measure the resistance between terminal B of the 2-way EBCM harness connector and the ground . Is the resistance measurement within the specified range? | 0-2 ohms | Go to Step 4 | Go to Step 12 | |
Using a J 39200 , measure the voltage between terminal A of the 2-way EBCM harness connector and the ground . Is the voltage equal to or greater than the specified value? | 10.0 V | Go to Step 6 | Go to Step 5 | |
5 | Inspect the grey fusible link. Is the grey fusible link open? | -- | Go to Step 13 | Go to Step 14 |
6 |
Is the connector in good condition? | -- | Go to Step 7 | Go to Step 15 |
Measure the resistance between terminal J of the 10-way EBCM harness connector and the ground using a J 39200 . Is the resistance measurement within the specified range? | 0-2 ohms | Go to Step 8 | Go to Step 16 | |
Is the voltage equal to or greater than the specified value? | 10.0 V | Go to Step 10 | Go to Step 9 | |
9 | Inspect the 15-amp I-3 fuse. Is the fuse open? | -- | Go to Step 17 | Go to Step 18 |
10 | Malfunction is intermittent, perform the following:
Does the DTC set as a current DTC? | -- | Go to Step 19 | Go to Diagnostic Aids |
11 | Repair the 2-way EBCM harness connector. Refer to Connector Repairs . Is the repair complete? | -- | Go to | -- |
12 | Repair the open or the high resistance in the CKT 350. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
13 | Repair the short to ground in the CKT 442. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
14 | Repair the open or the high resistance in the CKT 442. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
15 | Repair the 10-way EBCM harness connector. Refer to Connector Repairs . Is the repair complete? | -- | -- | |
16 | Repair the open or the high resistance in the CKT 451. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
17 | Repair the short to ground in the CKT 241. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
18 | Repair the open or the high resistance in the CKT 241. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
19 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- |
