P1874

DTC P1874: 4WD Low Switch Circuit Malfunction (Short)

Wiring Diagram










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 "4H" position (motor-shift type 4WD model).
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 60 km/h (37 mile/h) for 2 minutes.
6) Stop vehicle.
7) Check DTC, pending DTC and freeze frame data.

DTC Troubleshooting

1. Vehicle speed signal check

Check DTC in ECM, ABS hydraulic unit/control module and ESP(R) hydraulic unit/control module referring to DTC Check DTC Check
, DTC Check DTC Check
and DTC Check DTC Check.

Is there DTC P P0500: Vehicle speed sensor (VSS) malfunction in ECM and/or DTC C1021, C1022, C1025, C1026, C1031, C1032, C1035 and/or C1036 in ABS hydraulic unit/control module and ESP(R) hydraulic unit/control module?
YES -
Go to applicable DTC diag. flow.
NO -
Go to Step 2.

2.
Was "A/T System Check" performed?
YES -
Go to Step 2.
NO -
Go to A/T System Check A/T System Check.

3.
Do you have SUZUKI scan tool?
YES -
Go to Step 4.
NO -
Go to Step 5.

4. 4L/N switch and its circuit check

Connect SUZUKI scan tool to DLC with ignition switch OFF.
Turn ignition switch ON.
Select "DATA LIST" mode on scan tool.
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?
YES -
Intermittent trouble or faulty TCM. Check for intermittent trouble referring to Intermittent and Poor Connection Inspection Intermittent and Poor Connection Inspection. If OK, substitute a known-good TCM and recheck.
NO -
Go to Step 6.

5. 4L/N switch and its circuit check

Turn ignition switch ON.
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?
YES -
Intermittent trouble or faulty TCM. Check for intermittent trouble referring to Intermittent and Poor Connection Inspection Intermittent and Poor Connection Inspection. If OK, substitute a known-good TCM and recheck.
NO -
Go to Step 6.

6. 4L/N switch check

Check 4L/N switch for operation referring to Transfer Assembly Inspection:Motor-Shift Type (Transfer with Shift Actuator).

Is check result satisfactory?
YES -
4L/N circuit is shorted to ground. If wire and connections are OK, substitute a known-good TCM and recheck.
NO -
Replace 4L/N switch.