Make sure the RED LED turns on when turning the ignition key the START position. If not, check or replace the Throttle Position Sensor. Make sure the RED LED turns on when depressing the gas pedal. After the LED flashes 4 times, turn the dial fully counter clockwise. Turn the dial on the ECU fully clockwise. Turn the ignition switch on, but do not start the engine. Use Mode IV to determine if the Throttle Position Sensor (TPS), Starter circuit and/or Vehicle Speed Sensor (VSS) are in proper working order. Use Mode III to retrieve all stored trouble codes in memory. If the RED LED stays on or off above 2000 RPM, complete the diagnostics before beginning repairs. If the RED LED stays on, the mixture is more than 5% lean. If the RED LED stays off, the mixture is more than 5% rich. If the RED LED blinks simultaneously with the GREEN LED, the air/fuel mixture is cycling properly. Turn the dial on the ECU fully clockwise (or if you have a switch, turn it on).Īfter the LED flashes twice, turn the dial fully counter clockwise (or turn the switch off). Warm the engine to normal operating temperature. Use Mode II to determine if the air/fuel mixture is cycling correctly. If the LED does not flash, check the sensor's circuit. If the number of flashes are not more than five, replace the oxygen sensor. Make sure the GREEN LED goes on and off more than five times during ten seconds at 2000 RPM. Run the engine above 2000 RPM under no load while looking at the ECU. Use Mode I to determine if the Oxygen Sensor is functioning properly. To clear the ECU of any trouble codes, move the switch to the "DIAGNOSTICS" position then back to the "ON" position and turn off the key.ġ986.5-1995 Nissan ECU Flash Codes(all engines)ġ1 Crank Angle Sensor/Camshaft Position Sensor.ħ6 Fuel Injection System Function right hand bank.Ĩ6 Fuel Injection System Function right hand bank.Ĩ7 Canister Control Solenoid Valve Circuit.ĩ1 Front Heated Oxygen Sensor Heater Circuit right hand bank.ġ01 Front Heated Oxygen Sensor Heater Circuit right hand bank.ġ03 Park/Neutral Position Switch Circuit.ġ05 EGR and EGR Canister Control Solenoid Valve Circuit. Meaning: One red flash and two green flashes means code 12.Ĥ. Note each code as it is displayed, the red LED flashing once for 10's, and the green LED flashing once for 1's. After about five seconds it will start to output out the diagnostic codes as with the 4-cylinder ECU. After it blinks both LED's 3 times move the toggle switch back to the on position. Wait 5 seconds, then turn the screw fully counter clockwise.ģ. Mode 3 is the most commonly used mode and will yield the ECU trouble codes you need to figure out what's going on with your engine.įor VG30E with slotted switch: Turn the 'diagnostic mode selector' screw on the ECU fully clockwise. One time, pause, then 2 times, three times, pause.so on for each mode, 1 through 5. The red and green LED's on top of the ECU will blink simultaneously. Using a small screwdriver or tool, move it to the diagnostics position. A small toggle switch is behind it with 2 positions, "ON" and "DIAGNOSTICS". For VG30i: There is a little plastic tab you pull off of the side of the ECU (facing the door). Light is flashing and the ECU will keep all stored codes and the check engine light will remain on.ġ. To keep the codes stored, simply turn the key off as the check engine Wait 5 seconds, then turn the screw fully counter clockwise.ĥ. To clear all computer codes and turn the check engine light off, turn the screw fully clockwise while it is in diagnostic mode. The long flash(s) = 1st digit short flashes = 2nd digit.Ĥ. The check engine light will then begin to flash stored fault codes. Turn the 'diagnostic mode selector' screw on the computer fully clockwise. computers have either a small toggle switch on the side of the ECU box or, a slotted mode selector screw that turns 1/4 or 1/2 turn clockwise and counterclockwise to do the same task.ġ. Access to the computer is gained by sliding the seat forward or, by removing the seat entirely. Nissan Truck/Car OBD 1 Codes and Code Retrievalġ986-1989 D21 Nissan Hardbody Truck Codes
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