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Tech501
Tech501, Auto Service Technician
Category: Car
Satisfied Customers: 747
Experience:  38 years exp, ASE Mastertech with L1 Advanced Engine performance
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How do reset the check engine light on a 1989 Mazda b2200 truck

Customer Question

I just replaced the EGR vavle and I need to reset the engine light.
Submitted: 11 years ago.
Category: Car
Expert:  Tech501 replied 11 years ago.
 To reset it, simply disconnect the battery for 30 seconds or so. Don't be surprise if that didn't fix it though. There are many reasons for an EGR code to appear besides the valve itself. Please click on the ACCEPT button after viewing.
Customer: replied 11 years ago.
Reply to Tech501's Post: That was the first thing I tried and it doesn't work. I was told that you do different thing for different makes.
Expert:  Tech501 replied 11 years ago.

 Disconnect the battery clears the codes but if the problem is still there, it will immediatly reset.


Here's a way to check for what code your geting.



NOTE: This method may only be applicable to systems with a test connector and a Malfunction Indicator Light (MIL) or check engine light.



  1. Ground the test connector (1 pin wire) with a jumper wire.

    NOTE: The connector is located next to the Self-Diagnostic Connector.


  2. Turn the ignition switch to the ON position.
  3. If check engine light illuminates, goes off, and stays off no codes are present.
  4. If check engine light illuminates, goes off, and then starts flashing, codes are present.
  5. Count the flashes to determine the fault code.

    Code Interpretation:


  6. For single digit codes, short quick flashes will be displayed. For example code 8 is 8 quick flashes followed by a pause and either the next code or repeating the previous code.
  7. For double digit codes the first digit is a longer flash (more time in between flashes) followed by the second digit, a short quick flash. For example code 24 is 2 long flashes followed by 4 quick flashes and a pause for the next code or repeat of the previous code.

 1  Ignition Pulse. 


8  Air Flow Meter. <>< valign="top"> 
9 
Water Thermo Sensor. <>< valign="top"> 
10 
Intake Air Thermo Sensor (Air Flow Meter). <><
12 
Throttle Sensor. <>< valign="top"> 
14 
Atmospheric Pressure Sensor.
15  Oxygen Sensor. <>< valign="top"> 
17 
Feedback System.
25  Solenoid Valve (PRC).
26  Solenoid Valve (Purge Control) . <>< valign="top"> 
28 
Solenoid Valve (EGR). <>< valign="top"> 
34 
Idle Speed Control Valve (ISC). <>< valign="top"> 
40 
Oxygen Sensor Relay.

 










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