4-51A. ELECTRONIC CONTROL UNIT (ECU) OPERATING TEST (Continued).
Test sensors at each wheel location by disconnecting power to the ECU assembly.
Disconnect the sensor electrical connector (1) from the ECU assembly. Connect the leads
of a volt/ohm meter to the two wire component terminals inside the disconnected connector
(1). When checking the resistance, the meter must read 900 to 2000 ohms. Check and
replace the sensor (2) and cables as required.
(10) To perform a sensor gap adjustment push the sensor (2) into its holder (3) until it contacts
the tooth wheel (4). There must be no gap between the sensor and the tooth wheel. The
AC voltage should measure 0.2 volt AC when the wheel is rotated at a rate of 1/2
revolution per second. Make the necessary repairs and repeat Steps (1) through (7).
(11) To perform the fault code check, apply constant power to the ECU/dual modulator valve
assembly for more than one, but less than five seconds. Remove power and then reapply
power. The ABS indicator lamp should repeat the appropriate blink code (Ref. Table 4-4.
Fault Blink Code Chart) three times. Find the problem on the chart, repair as required and
repeat Steps (1) through (7).