Suzuki Grand Vitara XL-7 Service Manual page 438

TABLE A-2: NO LOCK-UP OCCURS
SYSTEM DESCRIPTION
TCM turns TCC solenoid OFF under any of the following conditions.
D Brake light switch is ON.
D 4WD low switch is ON.
D Transmission fluid temperature sensor circuit is in faulty condition. (P0710)
D Input shaft speed sensor is in faulty condition. (P0715)
D Output shaft speed sensor is in faulty condition. (P0720)
D TCC (lock-up) system circuit is in faulty condition. (P0743)
D Pressure control solenoid circuit is in faulty condition. (P0748)
D Shift solenoid circuit is in faulty condition. (P0753/P0758)
D Acceleration stroke signal circuit is in faulty condition. (P1700)
TROUBLESHOOTING
WARNING
D When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and be very careful during testing to avoid occurrence of an accident.
D Road test should be carried out with 2 persons, a driver and tester, on a level road.
Step
1 Was "A/T DIAGNOSTIC FLOW TABLE" in this
section performed?
2 Check DTC.
Is DTC P0710, P0715, P0720, P0743, P0748,
P0753, P0758 or P1700 detected?
3 Perform running test under the following
conditions and check voltage between
terminal E203-12 of TCM connector and
ground.
D Selector lever is in "D" range.
D Transfer lever is in "2H" position.
D Brake pedal is released.
D Drive vehicle with TCC ON condition
referring to "TCC LOCK-UP DIAGRAM" in
this section.
Is terminal voltage about 10 – 14 V?
4 Brake light switch signal inspection.
With ignition switch ON, check voltage
between terminal E202-16 of TCM connector
and ground.
Brake pedal is released: 0 – 1 V
Brake pedal is depressed: 10 – 14 V
Is result as specified?
5 4WD low switch signal inspection
With ignition switch ON, check voltage
between terminal E202-1 of TCM connector
and ground.
Transfer gear position "4L" or "N": 0 – 1 V
Transfer gear position "2H" or "4H": 10 – 14 V
Is result as specified?
Action
AUTOMATIC TRANSMISSION (4 A / T) 7B1-33
Yes
Go to Step 2.
Perform "TROUBLE
DIAGNOSIS TABLE" to
repair and retry.
Faulty TCC solenoid
valve, circuit or
transmission.
Go to Step 5.
Substitute a known-good
TCM and recheck.
No
Go to "A/T DIAGNOSTIC
FLOW TABLE" in this
section.
Go to Step 3.
Go to Step 4.
Mis-adjusted brake light
switch, faulty brake light
switch or its circuit.
If OK, substitute a known-
good TCM and recheck.
Faulty 4WD low switch or
its circuit.
If OK, substitute a known-
good TCM and recheck.