BLEEDING BRAKE SYSTEM
Note. For specific brake bleeding procedure, see appropriate ANTI-LOCK BRAKE SYSTEM article.
TRAC SYSTEM DOES NOT OPERATE
Ensure no DTCs are present. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM . Inspect IG power supply circuit. Battery voltage should be present. Inspect hydraulic lines for leakage. Repair as needed. Inspect speed sensor circuit(s). See DTC 31, 32, 33 OR 34 - SPEED SENSOR CIRCUIT.
TRAC INDICATOR LIGHT MALFUNCTION
Inspect indicator light circuit. Repair as needed. If circuit is okay, replace TRAC ECU.
TRAC OFF INDICATOR LIGHT MALFUNCTION
Inspect TRAC OFF indicator light circuit. Repair as needed. If circuit is okay, inspect TRAC cut switch circuit.
DTCS CANNOT BE RETRIEVED
Inspect TRAC OFF indicator light circuit. Repair as needed. If TRAC OFF indicator light circuit is okay, inspect Tc terminal circuit.
CLEARING CODES
Turn ignition on. Using a jumper wire, connect DLC1 or DLC2 terminals Tc and E1. see scheme 11 With vehicle stopped, depress brake pedal 8 or more times within 3 seconds. Ensure TRAC indicator light turns on. Remove jumper wire.
Tc TERMINAL CIRCUIT
| CAUTION | If ECU replacement is instructed in following testing, always ensure ECU connectors and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECU malfunction. |
Note. For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagram, see appropriate wiring diagram in WIRING DIAGRAMS .
TRAC OFF INDICATOR, TRAC CUT SWITCH CIRCUIT (LS400)
Note. For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagram, see appropriate wiring diagram in WIRING DIAGRAMS .
TRAC OFF INDICATOR, TRAC CUT SWITCH CIRCUIT
Note. For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagram, see appropriate wiring diagram in WIRING DIAGRAMS .
TRAC ACCUMULATOR & PUMP
| WARNING | When replacing accumulator, proper disposal methods must be followed. Loosen gas plug about 2 turns to a position where gas can leak out. After confirming all gas has been drained, remove gas plug and dispose of accumulator. Repeat operation if all gas is not released. Improper disposal can cause injury. |
| CAUTION | Hydraulic system is under high pressure. Use caution when opening hydraulic system. |
- Relieve high pressure fluid from accumulator. Remove air cleaner if necessary. Carefully disconnect brakeline from accumulator. Remove bolts and accumulator and pump assembly. Separate accumulator and pump. (Scheme 38)
- To install, reverse removal procedure. Tighten assembly mounting bolts. See «TORQUE SPECIFICATIONS»(ref-47563-S25304700242001100400000). Use 2 NEW "O" rings when installing union bolt and pressure hose onto pump and accumulator. Bleed brake and TRAC systems. See «BLEEDING BRAKE SYSTEM»(ref-47563-S13662872512001100400000).
Scheme 38
TRAC ACTUATOR
- Remove air cleaner, charcoal canister and ducting. Disconnect TRAC solenoid relay if necessary. Carefully disconnect brakelines from actuator. Remove bolts and actuator assembly. (Scheme 39)
- To install, reverse removal procedure. Tighten assembly mounting bolts. See «TORQUE SPECIFICATIONS»(ref-47563-S25304700242001100400000). Bleed brake and TRAC systems. See «BLEEDING BRAKE SYSTEM»(ref-47563-S13662872512001100400000).
