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 CHART

Step	Action	YES	NO
1	DTC check Connect scan tool to DLC with ignition switch turned OFF. Turn ON ignition switch and check DTC. Is there DTC U0073 and/or U0121?	Go to applicable DTC diag. flow.	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. A/C switch signal Engine running, A/C switch OFF: OFF Engine running, A/C switch ON and blower speed selector turned 1st position or more: ON Blower fan signal Engine running, blower speed selector OFF: OFF Engine running, blower speed selector 3rd position or more: ON PSP signal (Non-EPS model) Engine running, steering wheel to neutral position: OFF Engine running, turning steering wheel to the right or left as far as it stops: 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.