Diagnostic Flow Table A-1 - Suzuki sq-416-420-625 Service Manual

DIAGNOSTIC FLOW TABLE A-1 (NO TCC LOCK-UP OCCURS)
SYSTEM DESCRIPTION
PCM turns TCC solenoid OFF under any of the following conditions.
D Brake pedal switch: ON
D 4WD LOW switch: ON
D Cruise control module: TCC OFF command signal is output (if equipped).
D ECT: ECT < 30_C (86_F)
TROUBLESHOOTING
WARNING:
D When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and very careful during testing to avoid occurrence of an accident.
D Road test should be carried out with 2 person, a driver and tester, on a level road.
STEP
1 Was "AUTOMATIC TRANSMISSION
DIAGNOSTIC FLOW TABLE" performed?
2 ECT check:
(1) Warm up engine to normal operating
temperature.
(2) Check ECT using scan tool.
Is ECT more than 30_C (86_F)?
3 Perform running test under the following
conditions and check voltage between
C51-1-8 (G16/J20 engines) or C51-1-2 (H25
engine) terminal of PCM coupler and ground.
D Normal mode in "D" range.
D Transfer "2H" position.
D Cruise control is not operated (if equipped).
D Brake pedal released.
D Drive vehicle with TCC ON condition
referring to "TCC lock-up diagram" in
this section.
Is it battery voltage?
4 Is vehicle equipped with H25 engine?
5 Brake switch signal inspection:
(1) With ignition switch ON, check voltage
between E61-31 terminal of PCM coupler
terminal and ground.
Brake pedal
Voltage
Is the result as specified?
ACTION
Released Depressed
Battery
0 V
voltage
AUTOMATIC TRANSMISSION (4 A / T) 7B1-31
YES
Go to Step 2.
Go to Step 3.
Faulty TCC solenoid
valve, its circuit or
transmission.
Go to Step 5.
Go to Step 6.
NO
Go to "AUTOMATIC
TRANSMISSION
DIAGNOSTIC FLOW
TABLE".
Faulty ECT sensor, its
circuit or engine cooling
system.
If OK, substitute a known-
good PCM and recheck.
Go to Step 4.
Go to Step 6.
Faulty brake pedal switch
or its circuit.
If OK, substitute a known-
good PCM and recheck.