ECU OPERATING TEST - Continued
Disconnect sensor electrical connector (Figure 1, Item 1) from ECU assembly.
Connect leads of a multimeter to two wire component terminals inside disconnected connector.
When checking resistance, meter must read 900-2,000 Ohms.
Check and replace sensor (Figure 1, Item 2) and cables as required.
To perform a sensor gap adjustment, push sensor (Figure 1, Item 2) into its holder (Figure 1, Item 3) until it
contacts tooth wheel (Figure 1, Item 4).
ECU/DUAL MODULATOR VALVE MOUNTED WITH
SENSORS FACING FRONT OF SEMITRAILER
ECU Operating Test.
There must be no gap between sensor and tooth wheel.
Ac voltage should measure 0.2 V ac when wheel is rotated at a rate of 1/2 revolution per second.
Make necessary repairs and repeat Steps 1 through 7.
To perform fault code check, apply constant power to ECU/dual modulator valve assembly for more than 1,
but less than 5 seconds.
Remove power and then reapply power.
ABS indicator lamp should repeat appropriate blink code (Table 1) three times.
Find problem in Table 1, repair as required, and repeat Steps 1 through 7.