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VEHICLE SPEED SIGNAL CHECK
=NAEL0375S06
1 CHECK SPEEDOMETER OPERATION
Does speedometer operate normally?
Yes © GO TO 2.
No © Check speedometer and ABS actuator and electric unit circuit. Refer to wiring diagram in
EL-255.
2 CHECK VEHICLE SPEED INPUT
1. Apply wheel chocks and jack up drive wheel.
2. Disconnect ASCD control unit harness connector.
3. Check voltage between control unit terminal 22 and ground with turning drive wheel slowly by hand.
SEL263WB
Refer to wiring diagram in EL-254.
Yes © Vehicle speed signal is OK.
No © Check harness for open or short between ASCD control unit terminal 22 and combination
meter terminal 13.
ASCD PUMP CIRCUIT CHECK
NAEL0375S07
1 CHECK ASCD PUMP
1. Disconnect ASCD pump connector.
2. Measure resistance between ASCD pump terminals 1 and 2, 3, 4.
SEL262WB
Refer to wiring diagram in EL-254.
OK or NG
OK © GO TO 2.
NG © Replace ASCD pump.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont’d)
EL-262
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