Harness and connectorДў6 Boost Pressure sensor (Turbo models) The boost pressure sensor is open or shorted (abnormally high or low voltage is registered). Harness and connectorДў1* Ignition signal circuit The ignition signal in the primary circuit is not entered during engine cranking or running. Harness and connectorДЎ4 Speed Sensor circuit The Speed Sensor circuit is open or shorted. Sensor circuit is open or shorted (abnormally high or low voltage is registered). Harness and connector (if harness and connector are OK, MAS might be bad)ДЎ3 Engine Coolant Temp. Harness and connector (if harness and connector are OK, CAS might be bad)ДЎ2 Mass Air-Flow Sensor circuit (MAS) The MAS sensor circuit is open or shorted (abnormally high or low voltage is registered). Trouble Code: Detected Items: Malfunction Caused By: Check::ДЎ1* Camshaft Angle Sensor circuit (CAS) Either 1В° or 120В° signal is not entered for the first few seconds of engine cranking.Д®ither 1В° or 120В° signal is not input often enough while the engine speed is higher then the specified RPM. *Will cause the Check Engine light to come on under normal (MODE I) operating conditions. To exit MODE II - Heated Oxygen Sensor Monitor, turn the potentiometer fully counter clock-wise and stop the engine.ДҐ4: signal circuit from A/T control to ECU The switched on/off is 'closed loop', while a constant on or off is 'open loop'ДЎ1.

Any other indication would be abnormal and require further investigation. 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 at 2000 rpm again for a similar switching condition. To change to right sensor turn the ECU potentiometer clockwise with engine still running, wait 2 seconds, turn it back. Check that the LED blinks (or the check engine light) more than 5 times every 10 seconds at 2000 rpm.ДЎ0. Warm the engine to normal operating temperature, then run at 2000 rpm for 2 minutes. 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.Д©. 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.ДЁ. 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.Д¦. The screw potentiometer is on the right side of the ECU, the coding LED is in the oval hole above it.ДҐ. There are procedures to get some of the same results without a CONSULT tool from the ECU's memory.Дў.

Z32 ecu diagnostics