My Nissan Micra K12 was recently ‘hot wired’ via the starter motor. Since then, I have had problems with the battery draining, and the MIL has come on (fault codes P1122 and P1126). My question is – can the hotwiring to start the engine damage the ECU, or other electrics?
Thanks for any advice.
Well, if you shorted something out while hot wiring it, YES it can cause damage. If all your doing is supplying power to the “S” terminal to activate the starter… Not very likely that any damage would be caused to any other part of the vehicle.
P1122 Nissan – Electric Throttle Control Performance Problem
– Faulty Electric Throttle Control Actuator
– Electric Throttle Control Actuator harness is open or shorted
– Electric Throttle Control Actuator circuit poor electrical connection
Start by performing the “Idle Air Volume Learning Procedure”, if the problem persist the Electric Throttle Control Actuator may need to be replaced.
Electric Throttle Control Actuator consists of throttle control motor, Throttle Position Sensor (TPS), etc. The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.
The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.
P1126 Nissan – Throttle Control Motor Relay Circuit Open
– Fualty Throttle Control Motor relay
– Throttle Control Motor relay harness is open or shorted
– Throttle Control Motor relay circuit poor electrical connection
When is the code detected?
Engine Control Module (ECM) detects a voltage of power source for throttle control motor is excessively low.
P1126 Nissan Description
Power supply for the throttle control motor is provided to the Engine Control Module (ECM) via throttle control motor relay. The throttle control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not provided to the ECM.
Throttle Control Motor Relay Circuit Open is for Nissan vehicles other than the 2000-2001 models
can the hotwiring to start the engine damage the ECU, or other electrics?
Thank you very much for the detailed reply. Would replacing the entire throttle body solve the problems you list?
There is a good chance but without following through with testing it could also be a big waste of money. Could be as simple as a loose wire or connection.