Suzuki GRAND VITARA JB416, Service Manual

Page: 346 / 474

5A-27 Automatic Transmission/Transaxle:
DTC P1875 4L Switch Circuit Malfunction (Open)
S5JB0E5104045
Wiring Diagram
Refer to “DTC P1874 4L Switch Circuit Malfunction (Short): ”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTCs in TCM and ECM memories by using scan tool.
3) Start engine and transfer position switch to “4L” position.
4) Keep engine running at idle speed for 10 seconds or more with select lever “D” range.
5) Start vehicle and increase vehicle speed to about 50 km/h (31 mile/h) in “4L” position for 2 minutes.
6) Stop vehicle.
7) Check DTC, pending DTC and freeze-frame data.
4 4L switch and its circuit check
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 4L/N switch signal (ON or OFF) on display when
turning transfer position switch to each position.
4L/N switch specifications (scan tool)
“4H” position: OFF
“4L” position: ON
Is OFF / ON displayed as described above?
Intermittent trouble or
faulty TCM. Check for
intermittent trouble
referring to “Intermittent
and Poor Connection
Inspection: in Section
00 in related manual”. If
OK, substitute a known-
good TCM and recheck. Go to Step 6.
5 4L/N switch and its circuit check
1) Turn ignition switch ON.
2) Check terminal voltage “E93-4” of TCM connector
connected when turning transfer position switch to each
position.
4L/N switch specifications
“4H” position: 10 – 14 V
“4L” position: 0 – 1 V
Is voltage as specified?
Intermittent trouble or
faulty TCM. Check for
intermittent trouble
referring to “Intermittent
and Poor Connection
Inspection: in Section
00 in related manual”. If
OK, substitute a known-
good TCM and recheck. Go to Step 6.
6 4L/N switch check
1) Check 4WD low switch for operation referring to
“Transfer Assembly Inspection: Motor-Shift Type
(Transfer with Shift Actuator) in Section 3C”.
Is check result satisfactory?
4L/N circuit is shorted to
ground. If wire and
connections are OK,
substitute a known-
good TCM and recheck. Replace 4L/N switch.
Step Action Yes No
DTC Detecting Condition Trouble Area
Actual transfer position is 4L although TCM detected low switch is
turned OFF with vehicle speed between 29 km/h (18 mile/h) and
88 km/h (55 mile/h). (if equipped with 4L/N switch)
(1 driving cycle detection logic) • 4L/N switch or its circuit.
• TCM