Circuit Description
The solenoid valve relay supplies power to the solenoid valve coils in the EBCM/EBTCM. The solenoid valve relay, located in the EBCM/EBTCM, is activated whenever the ignition switch is in the RUN position and no faults are present. The solenoid valve relay remains engaged until the ignition is turned OFF or a failure is detected.
Conditions for Setting the DTC
| • | DTC C0121 will set anytime the solenoid valve relay is commanded on and the EBCM/EBTCM does not see battery voltage at the solenoid valves. |
| • | DTC C0121 will set anytime the EBCM/EBTCM commands the solenoid valve relay off and battery voltage is still present at the solenoid valves. |
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | The ABS/TCS disables. |
| • | The amber ABS/TCS indicator(s) turn on. |
| • | The Red BRAKE 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 ignition cycles pass with no DTCs detected. |
Diagnostic Aids
| • | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | Thoroughly inspect any circuitry that may be causing the 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 |
| • | The following conditions may cause an intermittent malfunction: |
| - | A poor connection |
| - | Rubbed-through wire insulation |
| - | A broken wire inside the insulation |
| • | If an intermittent malfunction exists refer to Troubleshooting Procedures Cell 4 in Electrical Diagnosis for further diagnosis. |
| • | The solenoid valve relay is an integral part of the EBCM/EBTCM and is not serviced separately. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | ||
2 | Inspect the ABS BATT 2 Maxifuse in the Underhood electrical Center 1. Is the fuse OK? | -- | ||
3 |
Is the fuse OK? | -- | ||
4 | Inspect the ABS BATT Minifuse in the Underhood electrical Center 1. Is the fuse OK? | -- | ||
5 |
Is the fuse OK? | -- | ||
Is the resistance within specifications? | OL (infinite) | |||
7 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | -- | |
8 | Repair the short to ground in CKT 440. Refer to Repair Procedures Cell 5 in Electrical Diagnosis. Is the circuit repair complete? | -- | -- | |
9 | Repair the short to ground in CKT 1802. Refer to Repair Procedures Cell 5 in Electrical Diagnosis. Is the circuit repair complete? | -- | -- | |
10 | Using the J 39200 DMM, probe between the ABS BATT 2 fuse test terminals and a good ground in order to measure the voltage. Is the voltage within specifications? | Battery voltage | Go to Power Distribution Cell 10 in Electrical Diagnosis | |
11 | Using the J 39200 DMM, probe between the ABS BATT Minifuse test terminals and a good ground in order to measure the voltage. Is the voltage within specifications? | Battery voltage | ||
12 | Repair the open or high resistance in CKT 1802. Refer to Repair Procedures Cell 5 in Electrical Diagnosis. Is the circuit repair complete? | -- | -- | |
Is the voltage within specifications? | Battery voltage | |||
14 | Repair the open or high resistance in CKT 440. Refer to Repair Procedures Cell 5 in Electrical Diagnosis. Is the circuit repair complete? | -- | -- |
