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TROUBLESHOOTING ELECTRONICALLY CONTROLLED 4WD 27C-18 Code No.C1610: 4WD Actuator Power Supply Relay OPERATION A relay is incorporated in 4WD-ECU, and the power DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set when the abnormality • Battery power supply voltage is less than 6 V. • Abnormal voltage in the 4WD-ECU. PROBABLE CAUSES • Malfunction of 4WD-ECU • Malfunction of electronic control coupling sole- noid • Damaged harness wires and connectors DIAGNOSIS PROCEDURE STEP 1. Check the wiring harness between Q: Is the check result normal? YES : Go to Step 2. NO : Repair the defective connector or the wiring STEP 2. Check of the electronic control coupling Q: Is the check result normal? YES : Go to Step 3. NO : Replace the electronic control coupling STEP 3. Check whether the diagnosis code is Q: Is diagnosis code No.C1610 set? YES : Replace the 4WD-ECU (Refer to Then go to Step 4. NO : Intermittent malfunction (Refer to GROUP − How to Cope with Intermittent Malfunction ). STEP 4. Check whether the diagnosis code is Q: Is diagnosis code No.C1610 set? YES : Return to Step 1. NO : This diagnosis is complete. Code No.C1613: 4WD Mode Switch Stuck OPERATION The 4WD-ECU controls the driving mode by the sig- DIAGNOSIS CODE SET CONDITION This diagnosis code is set when the abnormality • The 4WD switch is stuck on PROBABLE CAUSES • 4WD switch malfunction • Damaged harness wires and connectors • Malfunction of 4WD-ECU DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III data list • Item No.41: Mode SW Q: Is the check result normal? YES : Go to Step 4. NO : Go to Step 2. STEP 2. Check the wiring harness between 4WD Q: Is the check result normal? YES : Go to Step 3. NO : Repair the defective connector or the wiring |