1987 MAZDA 626 engine

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Page 1375 of 1865

MAZDA 626 1987  Workshop Manual 
ELECTRICAL COMPONENTS OF ELECTRONICALLY-CONTROLLED POWER STEERING (ECPS) 1 0 

ELECTRICAL
 COMPONENTS
 OF
 ELECTRONICALLY-CONTROLLED POW-
ER STEERING (ECPS) 
CIRCUIT DIAGRAM 
J POWER STEERING CONTROL

Page 1376 of 1865

MAZDA 626 1987  Workshop Manual 
1 0 ELECTRICAL COMPONENTS OF ELECTRONICALLY-CONTROLLED POWER STEERING (ECPS) 
76G10X-020 
76G10X-021 
Checking Condition 
Condition A 
1. Turn the ignition switch OFF. 
2. Start the engine and let it

Page 1377 of 1865

MAZDA 626 1987  Workshop Manual 
ELECTRICAL COMPONENTS OF ELECTRONICALLY-CONTROLLED POWER STEERING (ECPS) 1 0 
Diagnosis Table 
Condition Output pattern Malfunction Flow chart 
No. 
4.4V 
0V-
10 seconds Power steering sole-noid valv

Page 1379 of 1865

MAZDA 626 1987  Workshop Manual 
ELECTRICAL COMPONENTS
 OF
 ELECTRONICALLY-CONTROLLED POWER STEERING (ECPS) 1 0 
Flow Chart 
P/S—1 
Failure of solenoid valve or wiring harness (Control unit to Solenoid valve) 
Disconnect control u

Page 1383 of 1865

MAZDA 626 1987  Workshop Manual 
ELECTRICAL COMPONENTS OF 4-WHEEL STEERING 1 0 
TROUBLESHOOTING GUIDE 
Self-Diagnosis Function 
The four-wheel steering (4WS) control unit contains a self-diagnosis function to detect malfunctions 
wi

Page 1384 of 1865

MAZDA 626 1987  Workshop Manual 
1 0 ELECTRICAL COMPONENTS OF 4-WHEEL STEERING 
Condition B 
1. Place the vehicle on a chassis roller tester. Block 
the rear wheels, and secure it with chains. 
2. Turn the ignition switch OFF. 
3. S

Page 1386 of 1865

MAZDA 626 1987  Workshop Manual 
1 0 ELECTRICAL COMPONENTS OF 4-WHEEL STEERING 
4WS-0 Normal operation or failure of con-trol unit or harness 
Start engine. 
Disconnect R-01 (7-pin) connector. Check that 4WS warning light flashes or

Page 1389 of 1865

MAZDA 626 1987  Workshop Manual 
ELECTRICAL COMPONENTS OF 4-WHEEL STEERING 1 0 
4WS-6 Failure of rear to front steering ra-tio sensor or harness 
Start engine. 
I 
Check voltage between control unit terminal and body ground. 
OK 
Ch