Electric Load Signal Circuit Check: Troubleshooting

NOTE:

Before performed troubleshooting, be sure to read the PRECAUTIONS OF ECM CIRCUIT INSPECTION .
When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the special tool to ECM and/or the ECM connectors referring to INSPECTION OF ECM AND ITS CIRCUITS .

TROUBLESHOOTING PROCEDURES

Step	Action	YES	NO
1	DTC check Connect scan tool to DLC with ignition switch turned OFF. Turn ON ignition switch and check DTC for CAN-DTC. Is there any?	Go to TROUBLESHOOTING FOR CAN-DTC .	Go to Step 2.
2	Electric load signal circuit check Start engine and select "Data List" mode on scan tool. Check electric load signal under following conditions respectively. Blower fan signal (Manual A/C model) Ignition switch turned ON, blower speed selector turned OFF, 1st or 2nd position: OFF Ignition switch turned ON, blower speed selector turned OFF, 3rd position or more: ON Blower fan signal (Auto A/C model) Ignition switch turned ON, blower speed selector turned OFF or 1st position: OFF Ignition switch turned ON, blower speed selector turned OFF, 3rd position or more: ON Radiator fan signal Ignition switch turned ON, coolant temperature is lower than 97 °C (206 °F): OFF Engine running, coolant temperature is higher than 97 °C (206 °F): ON Electric load signal Engine running, rear defogger switch, small light or headlight switch OFF: OFF Engine running, rear defogger switch, small light or headlight switch ON: ON Is check result satisfactory?	Electric load signal circuit is in good condition.	Check defective signal circuit.