Suzuki GRAND VITARA XL-7 Owner's Manual page 427

7B1-18 AUTOMATIC TRANSMISSION (4 A/T)
Table A-1 : No TCC Lock-Up Occurs
SYSTEM DESCRIPTION
PCM turns TCC solenoid OFF under any of the following conditions.
• Brake pedal switch : ON
• 4WD LOW switch : ON
• Cruise control module : TCC OFF command signal is output (if equipped).
• ECT : ECT < 30 °C (86 °F)
TROUBLESHOOTING
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 person, a driver and tester, on a level road.
Step
1 Was "AUTOMATIC TRANSMISSION DIAG-
NOSTIC FLOW TABLE" performed?
2 ECT check :
1) Warm up engine to normal operating tem-
perature.
2) Check ECT using scan tool.
Is ECT more than 30 °C (86 °F)?
3 Perform running test under the following condi-
tions and check voltage between C51-1-8 termi-
nal of PCM coupler and ground.
• Normal mode in "D" range.
• Transfer "2H" position.
• Cruise control is not operated (if equipped).
• Brake pedal released.
• Drive vehicle with TCC ON condition refer-
ring to "TCC LOCK-UP DIAGRAM" in this
section.
Is it battery voltage?
4 Brake switch signal inspection :
With ignition switch ON, check voltage between
E61-34 terminal of PCM coupler terminal and
ground.
Brake switch specification
Brake pedal released : 0 V
Brake pedal depressed : Battery voltage
Is the result as specified?
Action Yes
Go to Step 2.
Go to Step 3.
Faulty TCC solenoid
valve, its circuit or trans-
mission.
Go to Step 5.
No
Go to "AUTOMATIC
TRANSMISSION DIAG-
NOSTIC FLOW TABLE" in
this section.
Faulty ECT sensor, its cir-
cuit or engine cooling sys-
tem.
If OK, substitute a known-
good PCM and recheck.
Go to Step 4.
Faulty brake pedal switch
or its circuit.
If OK, substitute a known-
good PCM and recheck.