Suzuki sq-416-420-625 Service Manual page 455

TROUBLESHOOTING (DTC P1875)
STEP
1 Was "A/T DIAG. FLOW TABLE" performed?
2 4WD low switch and its circuit check:
When using SUZUKI scan tool:
1) Connect SUZUKI scan tool to DLC with ignition
switch OFF.
2) Turn ignition switch ON.
3) Select "Data list" mode on scan tool.
4) Check 4WD low switch signal (ON or OFF) on
display when shifting transfer lever to each
position.
4H or 2H position: OFF
4L position
Is OFF/ON displayed as described above?
When not using SUZUKI scan tool:
1) Remove PCM cover.
2) Turn ignition switch ON.
3) Check voltage at terminal C51-1-26 for G16/J20
(C51-1-5 for H25) of PCM connector connected
when shifting transfer lever to each position.
4H or 2H position: 10 – 14 V
4L position
Is voltage as specified?
3 4WD low switch check:
1) Check 4WD low switch for operation referring to
"4WD Low Switch Inspection" below.
Is check result satisfactory?
1
1. 4WD low switch
ACTION
: ON
: 0 – 1 V
4WD Low Switch Inspection
1) Disconnect negative cable at battery.
2) Disconnect 4WD low switch coupler.
3) Check continuity between 4WD low switch terminals.
There should be continuity when transfer lever shifted to 4L posi-
tion and should be infinity when transfer lever shifted to 4H or 2H
positions.
If not, replace 4WD low switch.
4) Connect 4WD low switch coupler and battery negative cable.
AUTOMATIC TRANSMISSION (4 A / T) 7B1-53
YES
Go to Step 2.
Check for poor con-
nection at the termi-
nal of PCM if voltme-
ter is used in Step 2.
If connection is OK,
intermittent trouble
or faulty PCM.
Check for intermittent
referring to "Intermit-
tent and Poor
Connection" in
Section 0A.
"Or /W" or "B" circuit
open or short. If wires
and connections are
OK, substitute a
known-good PCM
and recheck.
NO
Go to "A/T DIAG.
FLOW TABLE".
Go to Step 3.
Replace 4WD low
switch.