EHPAS PUMP PROD. CHANGE/EHPAS AS-BUILT DATA CHANGE

Applicable Models

Related Category/Subcategory/Symptoms

ENGINE / FUEL / DOES NOT TURN OFF/WARNING LIGHT
ENGINE / ON-BOARD DIAGNOSTICS / IMPROPER OPERATION
STEERING / GENERAL INFO / DOES NOT TURN OFF/WARNING LIGHT
STEERING / GENERAL INFO / HEAVY OPERATION
BODY AND ACCESSORY / ON-BOARD TROUBLESHOOTING / IMPROPER OPERATION

MTOL - 4754 Dealer Repair Information

Symptom and Conditions

During April 2005 production, Mazda3 EHPAS pumps were commonized with  
the Mazda5 EHPAS due to cost reduction. The new EHPAS pump will work   
on the early Mazda3's (Built before April 2005). The old pump will NOT 
work on the vehicle's built after April 2005 because the as-built      
data for these vehicles has changed and requires data to be            
entered into the VID block line 5 byte 2 of the EHPAS module to        
determine if the vehicle is equipped with DSC. ALL N.A. 2004-2005 Mazda3
vehicles DO NOT have DSC. But the byte must be populated with the      
correct data to indicate this.     

                                    
See below for more details.                                            

Repair Procedure

If you are replacing the EHPAS pump, and your vehicle is built on/after 
April 1, 2005, check the build numbers on the pump. If the pump P/N is  
C238-32-600B or C and the build number is 995-11603 or later, proceed to
step #1. If the build number is 995-11602, then proceed to step 2.      
                                                                        
1. You will need to perform the normal WDS "Programmable Module         
Installation" procedure. When completed, clear all DTC's and verify     
repair. Procedure complete.                                             
                                                                        
2. You will need to perform a "NO COMMs" vehicle session and manually   
enter the as-built data for your vehicle. Contact the Technical         
Assistance Hotline to obtain as-built data for your vehicle.            
                                                                        
3. Enter the as-built data from the sheet for lines 730-01-01 to 730-04-
01. On line 730-05-01 you must select the correct as-built data below   
depending on the tire size of your vehicle.                             
                                                                        
15" tires  = 730-05-01  0601  0000  0042                                
16" tires  = 730-05-01  0501  0000  0043                                
17" tires  = 730-05-01  0401  0000  0044                                
                                                                        
4. Make sure after entry of all data you receive a screen that says     
"EPS module configuration successful". If not, attempt procedure        
again.                                                                  
                                                                        
5. When configuration is complete, clear all DTC's, and verify repair.  
   Procedure complete.

FYI ONLY                                                                
                                                                        
Example of EHPAS As-built data prior to April 2005 production (line 5)  
                                                                        
730-05-01  0500  0000  00CS                                             
                                                                        
 BYTE  1             BYTE 2, 3, 4, 5                     CS = Check sum 
06 = 15" tires       00 = default - no data required                    
05 = 16" tires                                                          
04 = 17" tires                                                          
                                                                        
Example of EHPAS As-built data April 2005 production and later (line 5) 
                                                                        
730-05-01  1001  0000  00CS                                             
                                                                        
  BYTE  1             BYTE 2            Byte 3, 4, 5      CS = Check Sum
0F = 15" tires        00 = W/DSC        00 = default 
10 = 16" tires        01 = W/O DSC      no data req'd                  
11 = 17" tires                                                         
                                                                       
OLD EHPAS PUMP P/N  (before April 2005 Prod)     BP4L-32-600           
This pump cannot be installed into vehicles built after Aptil 1, 2005. 
NEW EHPAS PUMP P/N  (April 2005 or later Prod)   C238-32-600B          
with build numbers of KOYO 995-11602  - requires combination of as-built
with build numbers of KOYO 995-11603  - works with early & late as-built
                                                                       
Installing the old EHPAS pump into an April 2005 or later production   
Mazda3 will cause WDS to give you a "configuration unsuccessful" error 
message during PMI. It will also cause the power steering warning light
to illuminate and DTC's P2141, C1278, and or B2477 to be stored.