Hey guys, I just installed a later model ECU into my Z and though everything is working fine so far, I just noticed the potentiometer you turn to check error codes is pointing downwards towards the right. My old ECU had it pointing upwards towards the right.

 

I have looked up some info on which mode this is set to at the moment but I don't really know which way the potentiometer should be pointing to for normal mode.

 

 

Any ideas what this is set to?

Codes under Mode II

11: crank angle sensor circuit

12*: air flow meter circuit

13*: engine coolant temp. sensor circuit

14*: vehicle speed sensor circuit

21: ignition signal circuit

26*: boost pressure sensor

31*: ECU

32*: EGR function

33*: exhaust gas sensor circuit (left)

34: detonation sensor circuit

35*: exhaust gas temp. sensor circuit

42: fuel temp. sensor circuit

43*: throttle position sensor circuit

45*: injector leak

51*: injector circuit

53*: exhaust gas sensor circuit (right)

54: signal circuit from A/T control to ECU

55: NO malfunctions in the above

 

* indicates that the “Check Engine” light will come on under normal driving.

 

8. Turn the screw fully clockwise, wait 2 seconds, and turn back fully counter-clockwise to exit Mode II and return to Mode I.

 

To check O2 sensors

 

1. While in Mode II, start the engine and warm the engine up.

 

2. The ECU is now checking the left O2 sensor. Run the engine at 2000rpms for 2 minutes and watch the “Check Engine” light. The light should be blinking constantly.

 

3. To check the right O2 sensor, turn the screw on the ECU fully clockwise, wait 2 seconds, and then turn back fully counter-clockwise, the ECU will now be checking the right O2 sensor. Run the engine at 2000rpms for 2 minutes while watching the “Check Engine” light. As before, the light should be blinking constantly.

 

4. The light indicates the signal from the O2 sensor to the ECU. When the light is ON, it is rich. When the light is OFF, it is lean. It should be blinking, which means it is constantly switching between rich and lean. If the light is not constantly blinking, there is something wrong and will require further investigation.

 

5. Turn the screw on the ECU full clockwise, wait 2 seconds, and turn back fully counter-clockwise. The ECU will be back in Mode I.

I appreciate the reply but i dont need to check codes i have consult. What i need to know is the ecu looking like its set to mode 1 or mode 2 in that photo.