Why check engine, four wheel-drive system, and ABS light on after ECU was replaced?

Engine compartment

Toyota Matrix - fuse box - engine compartment

Instrument panel

Toyota Matrix - fuse box - instrument panel

Fuses (type A)

Fuse Ampere rating Description 1 FOG 15 Front fog lights 2 HEAD LH UPR 10 Left?hand headlight (high beam) 3 HEAD RH UPR 10 Right?hand headlight (high beam), high beam indicator light 4 SPARE 30 Spare fuse 5 SPARE 15 Spare fuse 6 SPARE 10 Spare fuse 7 ETCS (1ZZ?FE engine with two?wheel drive models only) 10 Electronic throttle control system 8 AMP 30 Car audio system 9 MAIN 30 Starting system, "AM2" fuse 10 DOME 15 Car audio system, clock, personal lights, interior light, trunk light, open door warning light, wireless remote control system 11 HORN 10 Horn 12 HAZARD 10 Emergency flashers, turn signal lights 13 EFI 15 Multiport fuel injection system/sequential multiport fuel injection system, emission control system, "EFI" fuse 14 ALT?S 5 Charging system 15 HEAD LH LWR 10 Left?hand headlight (low beam) 16 HEAD RH LWR 10 Right?hand headlight (low beam) 17 EFI2 (1ZZ?FE engine with two? wheel drive models only) 15 Multiport fuel injection system/ sequential multiport fuel injection system, emission control system 18 TAIL 15 Tail lights, license plate lights, instrument panel lights, instrument cluster lights, clock 19 OBD 7,5 On?board diagnosis system 20 WIPER 25 Windshield wipers 21 AM2 15 Charging system, multiport fuel injection system/sequential multiport fuel injection system, starting system, SRS airbag system 22 STOP 15 Stop lights, high mounted stoplight, anti?lock brake system, shift lock control system, multiport fuel injection system/sequential multiport fuel injection system, cruise control system 23 DOOR 25 Power door lock system, glass hatch opener switch 24 AM1 25 "CIG" fuse 25 ECU?IG 10 Electric cooling fan, anti?lock brake system, traction control system, vehicle stability control system, brake assist system, shift lock control system, cruise control system 26 RR WIPER 15 Rear window wiper 27 A/C 10 Air conditioning system 28 INV 15 Power outlet (115 VAC) 29 P/POINT 15 Power outlet (12 VDC/ in the rear console box) 30 ECU?B 10 Daytime running light system 31 CIG 15 Power outlet (on the instrument panel) or cigarette lighter, car audio system, clock, power rear view mirror control, shift lock control system 32 GAUGE 10 Gauges and meters, air conditioning system, daytime running light system, charging system, auto anti?glare inside rear view mirror, power windows, cruise control system, rear window defogger, back?up lights, front passenger's seat belt reminder light 33 WASHER 15 Windshield washer, rear window washer 34 M?HTR/DEF I?UP 10 Engine control system

Fuses (type B)

Fuse Ampere rating Description 35 ABS NO.1 30 Anti?lock brake system, vehicle stability control system, traction control system, brake assist system 36 RDI FAN 30 Electric cooling fan 37 ABS NO.2 40 (without vehicle stability
control system) Anti?lock brake system 50 (with vehicle stability
control system) Anti?lock brake system, vehicle stability control system, traction control system, brake assist system 38 HEAD MAIN 40 "HEAD LH UPR", "HEAD RH UPR", "HEAD LH LWR" and "HEAD RH LWR" fuses 39 AIR PUMP 50 (1ZZ?FE engine with four?wheel drive models and 2Z ?GE engine only) Emission control system 40 HTR 40 Air conditioning system 41 DEF 30 Rear window defogger, "M?HTR/DEF I?UP" fuse 42 POWER 30 Power windows, electric moon roof

Fuses (type C)

Fuse Ampere rating [A] Description 43 ALT 100 Charging system, "ABS NO.1", "ABS NO.2", "RDI FAN", "FOG", "HTR", "AM1", "POWER", "DOOR", "ECU?B", "TAIL", "STOP", "P/POINT", "INV" and "OBD" fuses WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

I suggest scanned the ABS module in order to know fault codes stored there; sometimes just need speed wheel sensor adjustemtn, but need the real fault code in there.

ASR - Acceleration Skid Control system.
When ASR warning light blinking the system is activated itself for car acceleration skid control.
For today's typical high-torque engines, traction control (ASR) can increase both comfort and safety, particularly when driving on slippery roads or surfaces offering differing levels of grip. Traction control permits smooth starting and acceleration through the full speed range without wheel-spin or fishtailing.


ASR only operates in conjunction with the electronic accelerator (E-gas) and uses components of the anti-lock braking system (ABS). If one wheel suddenly begins to rotate faster than the others (slip), ASR intervenes in the engine management system and reduces power until the wheel stops spinning.
The ASR system represents a further contribution to active safety as it maintains vehicle traction and directional stability throughout the acceleration phase at any speed. In addition, it reduces tyre wear. Activation of the ASR system is indicated by a flashing indicator lamp in the instrument cluster.

The ESP system means the Electronic Stability Program. If the ESP lights on the dashboard permanently the ESP system is faulty. You must access the ESP Electronic Control Unit (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ESP ECU, in other words reset the ESP system and turn off the warning lamp on dashboard.

Check & replace if necessary the brake pedal switch placed above pedals on the support.
If the problem still occurs you might access the ABS ECU (Electronic Control Unit) using diagnostic equipment (VAS, VAG-Com, or similar) connected to the data link connector of the car, in order to pull out all DTC's (Diagnostic Trouble Code) memored. Then you will be able to replace bad piece(s) and fix the problem by erasing all DTC's stocked inside ABS ECU & reset it.

Good Luck!

ABS = Anti-lock Brake System.
TC = Traction Control System (Engine Control Module).
If the ABS lights on the dashboard permanently the ABS system is faulty. You must access the ABS & TC Electronic Control Units (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ABS ECU, in other words reset the ABS system and turn off the warning lamp on dashboard.
I suspect bad brake pedal switch, but you should scan the ABS & TC ECU's.

ABS - Anti-lock Brake System.
If the ABS lights on the dashboard permanently the ABS system is faulty. You must access the ABS Electronic Control Unit (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ABS ECU, in other words reset the ABS system and turn off the warning lamp on dashboard.
ASR - Acceleration Skid Control system.
When ASR warning light blinking the system is activated itself for car acceleration skid control.
For today's typical high-torque engines, traction control (ASR) can increase both comfort and safety, particularly when driving on slippery roads or surfaces offering differing levels of grip. Traction control permits smooth starting and acceleration through the full speed range without wheel-spin or fishtailing.


ASR only operates in conjunction with the electronic accelerator (E-gas) and uses components of the anti-lock braking system (ABS). If one wheel suddenly begins to rotate faster than the others (slip), ASR intervenes in the engine management system and reduces power until the wheel stops spinning.
The ASR system represents a further contribution to active safety as it maintains vehicle traction and directional stability throughout the acceleration phase at any speed. In addition, it reduces tyre wear. Activation of the ASR system is indicated by a flashing indicator lamp in the instrument cluster.
The ESP system means the Electronic Stability Program. ESP system includes the ABS system.

ASR - Acceleration Skid Control system.
When ASR warning light blinking the system is activated itself for car acceleration skid control.

For today's typical high-torque engines, traction control (ASR) can increase both comfort and safety, particularly when driving on slippery roads or surfaces offering differing levels of grip. Traction control permits smooth starting and acceleration through the full speed range without wheel-spin or fishtailing.


ASR only operates in conjunction with the electronic accelerator (E-gas) and uses components of the anti-lock braking system (ABS). If one wheel suddenly begins to rotate faster than the others (slip), ASR intervenes in the engine management system and reduces power until the wheel stops spinning.
The ASR system represents a further contribution to active safety as it maintains vehicle traction and directional stability throughout the acceleration phase at any speed. In addition, it reduces tyre wear. Activation of the ASR system is indicated by a flashing indicator lamp in the instrument cluster.

The ESP system means the Electronic Stability Program. If the ESP lights on the dashboard permanently the ESP system is faulty. You must access the ESP Electronic Control Unit (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ESP ECU, in other words reset the ESP system and turn off the warning lamp on dashboard.

Problems with ABS can be frustrating. You have senors on the front wheels, you have wires that run to the sensors, plus you have the ECU mounted to the master cylinder or on the fire wall depends on other options. Now the wheel sensors work like little alternators. Your wheels will have a gear that the senor reads as the wheel turns and then creates an A/C voltage that tells the ECU unit that the wheels are turning. Having a ABS code could mean that wiring to one of the sensors is broken or has fallen off, or is corroded at the plug end. Your ABS system has four major parts the ECU, an ABS hydraulic unit and the wiring harness to the wheel sensors, then last the sensors themselves. Now learn what each part looks like I am posting pictures for you. You will need to check all the wiring harnesses to each part. Then check the sensors. here is the ECU unit --->> --->>> Next is the Hydraulic unit.--->>>--->>> Then the wheel sensors. --->>> If you have a multi meter you can read the voltage of each wheel sensor at the other end of its wiring harness. Jack up the front end and find the end of each wheel sensor harness and spin the wheels by hand. you should get a reading on the AC voltage scale of about ..45 volts. not quite a half volt. when the wheel stops the meter should go to zero. spin the wheel and the meter should show voltage. That will tell you if the sensor and the wiring is good. The ECU has no trouble shooting it is good or bad.can't help you there. same with the Hydraulic unit. Most times it will be a wire broken or a bad wheel sensor. Good hunting.

the abs system has nothing to do with it.

I would start by either replacing the abs switch or checking the present one to be sure it is ok. I am assuming there is disc brakes all four wheels. The pumping would indicate to me that the rotors are not running true or again the abs sys is trying to kick in. Hope this helps.

sounds like ABS module fault
its getting signal thinking your driving and an ABS event is happening the ABS ECU comands engine ECU to reduce power(missfire) need to read codes from system to point you in right direction.
ABS sensor?
ABS ECU?
WIRING PROBLEM?
ENGINE ECU?