MotronicTo access the fault system, place an LED test light* between the red wire on the black connector and the yellow/black wire on the blue connector under the shift boot. Then turn the ignition on (but don't start the car) and place a jumper between the brown wire on the black connector and the yellow wire on the white connector for at least 5 seconds. Remove the jumper, and the LED should flash one long pulse, then several shorter pulses (with spaces) indicating codes. Please click here for an example.
The example picture above would indicate a 1234 code. Connect the jumper again for at least 4 seconds to advance to the next code. When "0000" (2.5s flashes at 2.5s intervals) or "4444" is read, the sequence is completed. To clear the codes, connect the jumper with the ignition off, then turn it on. After 5 seconds, remove the jumper, and "4444" should be read.
*Note: California cars come equipped with a "CHECK" light on the dashboard. This light is used in place of the LED, which is not required on these models. Just use the jumper.
|1111||Control unit||Defective control unit (common misdiagnosis)|
|1231||Speed sender||Faulty speed sender, bad speedometer cable, or bad cluster fuse|
|2112||Ignition reference sensor||Defective sensor or wiring|
|2113||Hall sender||Defective sensor or wiring|
|2121||Idle switch||Defective or misadjusted sensor, or faulty wiring|
|2123||Full-throttle switch||Defective or misadjusted sensor, or faulty wiring|
|2141||Knock sensor I||Engine knock due to incorrect fuel, incorrect timing, or faulty sensor|
|2142||Knock sensor I||Faulty sensor wiring, faulty sensor, or faulty control unit|
|2144||Knock sensor II||Faulty sensor wiring, faulty sensor, or faulty control unit|
|2231||Idle speed stabilizer has exceeded adaptive range||Throttle valve adjustment incorrect, incorrect timing, evap system faulty, or intake air leaks|
|2232||Air flow sensor potentiometer||Defective sensor or wiring|
|2312||Coolant temperature sensor||Defective sensor or wiring|
|2341||Oxygen sensor control exceeded||Idle mixture incorrectly adjusted, faulty sensor wiring, leaking cold start valve, evap system faulty, or intake air leaks|
|2342||Oxygen sensor system (faulty signal or exceeding adjustment range)||Faulty sensor wiring, faulty sensor, incorrect idle speed, leaking cold start valve, or intake air leaks|
|2411||EGR system (California only)||Intake air temperature sensor faulty, faulty EGR sensor wiring, faulty or plugged EGR system|
|4431||Idle stabilizer valve||Faulty wiring or valve, or control unit|