4WD Control Symptom Diagnosis
WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
Diagnose transfer assembly after performing the following inspections.
- Perform 4WD control system check referring to 4WD CONTROL SYSTEM CHECK .
- Confirm 4WD control system operation referring to 4WD CONTROL SYSTEM OPERATION
- Check transfer oil level for insufficient or incorrect oil referring to TRANSFER GEAR OIL INSPECTION AND CHANGE .
- Check transfer mountings for wear or looseness.
4WD CONTROL SYMPTOM DIAGNOSIS
| Condition | Possible Cause | Action |
|---|---|---|
| Transfer does not operate (2WD/4WD indicator does not operate) | "2WD" <--> "4WD" switch, "N" switch and/or "4L" switch faulty | Check switch referring to 2WD/4WD SWITCH INSPECTION . |
| Transfer shift actuator faulty | Check transfer shift actuator referring to TRANSFER SHIFT ACTUATOR INSPECTION . | |
| Transfer shift switch, 4WD switch and/or 4WD low switch faulty | Check switch referring to 4WD SWITCH, 4WD LOW SWITCH AND TRANSFER FORK SWITCH REMOVAL AND INSTALLATION . | |
| Transmission range sensor ("N" range) faulty (for A/T model) | Adjust or check transmission range sensor referring to TRANSMISSION RANGE SENSOR INSPECTION AND ADJUSTMENT . | |
| CPP switch faulty (for M/T model) | Check CPP switch referring to CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION AND ADJUSTMENT . | |
| VSS faulty | Check VSS referring to DTC P0500: VEHICLE SPEED SENSOR . | |
| Wiring or grounding faulty | Repair as necessary. | |
| 4WD control module faulty | Check 4WD control module referring to INSPECTION OF 4WD CONTROL MODULE AND ITS CIRCUITS | |
| Transfer refuses to operate (2WD/4WD indicator flashes, and then transfer does not shift) | Transfer shift actuator faulty | Check transfer shift actuator referring to TRANSFER SHIFT ACTUATOR INSPECTION . |
| Transfer shift switch, 4WD switch and/or 4WD low switch faulty | Check switch referring to 4WD Switch, 4WD Low Switch and Transfer Fork Switch Inspection . | |
| Weakened or broken synchronizer spring | Check spring referring to TRANSFER INSPECTION . | |
| Distorted shift shaft or shift fork | Check shift fork referring to TRANSFER INSPECTION . | |
| Weakened front drive shift shaft spring | Check spring referring to TRANSFER INSPECTION . | |
| Distorted or dispositioned front drive shift shaft circlip and washer | Check circlip and washer referring to TRANSFER INSPECTION . | |
| Worn synchronizer ring | Check synchronizer ring referring to TRANSFER INSPECTION . | |
| Worn chamfered tooth on sleeve or gear | Check chamfered tooth and ring gear referring to TRANSFER INSPECTION . | |
| Distorted shift shaft | Check shift shaft referring to TRANSFER INSPECTION . | |
| Wiring or grounding faulty | Repair as necessary. | |
| 4WD control module faulty | Check 4WD control module referring to INSPECTION OF 4WD CONTROL MODULE AND ITS CIRCUITS . | |
| Front axle does not lock/unlock although 2WD/4WD indicator operates | Front axle lock actuator faulty | Check front axle lock actuator referring to AXLE LOCK ACTUATOR AND MOTOR ON-VEHICLE INSPECTION : Front and AXLE LOCK ACTUATOR MOTOR INSPECTION : Front. |
| Front differential faulty | Check front differential referring to FRONT DIFFERENTIAL SYMPTOM DIAGNOSIS : Front. | |
| Wiring or grounding faulty | Repair as necessary. | |
| 4WD control module faulty | Check 4WD control module referring to INSPECTION OF 4WD CONTROL MODULE AND ITS CIRCUITS . | |
| Gear slipping out of mesh | Worn shift fork shaft | Check shift fork shaft referring to TRANSFER INSPECTION . |
| Worn shift fork or synchronizer sleeve | Check shift fork or synchronizer sleeve referring to TRANSFER INSPECTION . | |
| Weak or damaged locating spring | Check locating spring referring to TRANSFER INSPECTION . | |
| Worn bearings on input shaft or main shaft | Check bearing referring to TRANSFER INSPECTION . | |
| Worn chamfered tooth on sleeve or gear | Check sleeve and gear referring to TRANSFER INSPECTION . | |
| Missing or disengagement of circlip(s) | Check circlip(s) referring to TRANSFER INSPECTION . | |
| Noise | Damaged or worn bearing(s) | Refer to TRANSFER INSPECTION . |
| Damaged or worn gear(s) | Refer to TRANSFER INSPECTION . | |
| Damaged or worn synchronizer ring | Refer to TRANSFER INSPECTION . | |
| Damaged or worn chamfered tooth on sleeve or gear | Refer to TRANSFER INSPECTION . |