DTC 26: Center Differential Lock Detection Switch
NOTE:
DTC sets if ECU detects an open circuit in center differential lock detection switch system.
- Start engine. Ensure 4WD indicator light operates correctly when transfer shift lever is moved to desired 4WD positions. If indicator light does not operate correctly, go to step 4). If indicator light operates correctly, go to next step.
- Disconnect ECU 22-pin connector. Turn ignition on. Using DVOM, check voltage between ECU 22-pin connector terminal No. 35 and ground. See Figure -6. Battery voltage should exist in 4WD. Go to next step.
- If voltage is not as specified, check and repair connectors and wiring harness between center differential lock detection switch and ECU. See WIRING DIAGRAMS
. Center differential lock detection switch is located on side of transfer case. See Fig 1
. If voltage is as specified, check and repair ECU 22-pin connector. If connector is okay, replace ECU.
NOTE: When checking for short in ECU circuit, remove ECU connector and ensure 4WD indicator light operates correctly. If 4WD indicator light operates correctly, replace faulty ECU. If 4WD indicator light does not operate correctly, replace faulty 4WD indicator control unit.
- If no indicator lights come on, repair 4WD indicator power circuit, or check for faulty 4WD indicator control unit. See 4WD CONTROL UNIT under COMPONENT TESTS
. If center differential light comes on, regardless of position of transfer shift lever, check the following:
- Check for short in center differential lock switch circuit.
- Check for faulty center differential lock switch.
- Check for short in ECU circuit or faulty ECU.
- Check for short in indicator control unit circuit or faulty 4WD indicator control unit.
Repair wiring harness or replace component as necessary. See WIRING DIAGRAMS .
- If 4WD indicator light does not come on with transfer shift lever in "4H" position, repair wiring harness between 4WD indicator control unit and center differential lock switch. Check for faulty 4WD indicator control unit.
- If 4WD indicator light does not come on with transfer shift lever in "4H" position, repair wiring harness between 4WD indicator control unit and free wheel engage switch. See WIRING DIAGRAMS . Check ground wire at engage switch. Check for faulty free wheel engage switch.