Harness and connector (if harness and connector are OK, CAS might be bad) *Will cause the Check Engine light to come on under normal (MODE I)operating conditions.Įither 1° or 120° signal is not entered for the first few secondsof engine cranking.Įither 1° or 120° signal is not input often enough while theengine speed is higher then the specified RPM. To exit MODE II - Heated Oxygen Sensor Monitor, turn the potentiometer fully counter clock-wise and stop the engine.ĥ4: signal circuit from A/T control to ECU The switched on/off is 'closed loop', while a constant on or off is 'open loop'ġ1. Any other indication would be abnormal and require further investigation. ON=rich, Off=lean.Blinking light means system is constantly adjusting between lean and rich which is normal. NOTE: Light indicates signal from sensor to ecu. Check the lights at2000 rpm again for a similar switching condition. To change to right sensor turn the ECU potentiometer clockwise withengine still running, wait 2 seconds, turn it back. Check that the LED blinks (or the check engine light) more than5 times every 10 seconds at 2000 rpm.ġ0. Warm the engine to normal operating temperature, then run at 2000 rpm for 2minutes. The ECU is now monitoring the left O2 sensor. Start engine with the ECU in MODE II to enter MODE II - Heated Oxygen Sensor (O2) Monitor. Wait at least 2 seconds,then turn the potentiometer fully counter clock-wise, or.ĩ. To exit MODE II, turn pot fully clock-wise. Long flash is first digit, short flash is 2nd digit,the codes are at the bottom of this page.Ĩ. Read the codes from the flashing LED on the side of the ECU (or the check engine light). Wait at least 2 seconds, then turn pot fully counter clock-wise. Turn 'diagnostic mode selector' (pot on side) fully clockwise. Turn the ignition switch on, but do not start the engine.Ħ.
The screw potentiometer is on the right side of the ECU, the coding LED is in the oval hole above it ( 4.).ĥ. Remove the wooden floorboard ( 3.) (4 x 10 mm bolts)Ĥ. It's held up with 3 spots of velcro ( 2.).ģ. There are procedures to get some of the same results without a CONSULT tool from the ECU's memory.Ģ. Nissan offers CONSULT tests for a fee to pin point problems through the ECU.
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