Diagnosis By Indicator Lamp
Diagnosis of The Faults Based on the Status of 4WD Indicator Lamp, 4WD Switch and T/F Change LeverA diagnostic flow chart is shown below. If after performing the diagnosis and a condition still exists, then there may be a fault in the ECU. The ECU will need to be replaced and perform the diagnostic flow chart again.
Fault on Switching from 2WD to 4WD
1. When the 4WD indicator lamp blinking pattern changes (from 2Hz to 4Hz) after performing "Solution 1."
The motor actuator or the transfer case assembly may be inoperative. Remove the motor actuator and perform bench test. Make any needed repairs and perform "Solution 1" again. Then disassemble and inspect the transfer case assembly. Repair or replace as needed. If after the repairs, the condition still exists, then replace the ECU.
2. When the 4WD indicator lamp do not blink or light up when switching from 2WD to 4WD.
3. When the 4WD indicator lamp continues to blink after performing Solution.
Fault on Switching from 4WD to 2WD
1. Case that indicator does not blink nor turn out.
2. When the indicator lamp continues to blink (at 2Hz) after performing Solution 3.
3. Case that indicator's blinking changes to 4Hz after aforementioned Solution 4 is carried out.