TROUBLE-SHOOTING AND DIAGNOSES
2
Troubles Detected by Self-diagnosing and Their Indication
Throttle sensor
I I
switch is turned on to 2nd speed
switch and lock-up control
unit harness.
faster than 2nd speed
0 Vehicle speed sensor defective
@ Harness is broken between
(Inspection-1)
vehicle speed sensor and
lock-up control unit
+
@ Throttle sensor defective
(Inspection.2)
@ Harness is broken between
throttle sensor and lock-up
control unit
@ Lock-up control unit malfunc-
tions
INSPECTION POINTS
Checking method No of
inspection Checking item
Vehicle speed sensor
1 Connect tester to connector terminals, Nos 11 and 22, of lock-
up control unit.
2 Check voltage variation by running vehicle over 1
m (3 ftl at
very slow speed
Proper indication
Voltage must vary from OV to over 5V
1
1 Connect tester to connector terminals. Nos 4 and 22, of lock-
up control unit
2 Measure voltage while operating accelerator pedal
Proper indication
Accelerator pedal in fullclose throttle position OV
Accelerator pedal in full-open throttle position 4V
AT-90
