Transfer Case - Will Not Shift/MIL ON: Overview

No: 41/03/97/NAS

Ref: WSM section 41

Issue: 1

Date: 06/20/97

Pride IV 1-16

Transfer Gearbox Control Unit (TCU)

Diagnostics

AFFECTED VEHICLE RANGE:

RANGE ROVER (LP) ALL

SITUATION:
There have been reports of customers experiencing problems relating to the transfer gearbox control system. In some cases the failure to shift has been accompanied by a MIL illumination. The diagnosis of the following is covered in this document:

^ Vehicle will not range shift.

^ MIL illumination with DTCs 1701, 1703 or 1708.

^ Message Centre: "Slow Down", "Select Neutral" or "Transfer Neutral".

^ Cruise Control inoperative.

^ Vehicle shifting poorly in High or Low ranges.

^ H-gate illumination problems.

RESOLUTION:

DIAGNOSE AND REPAIR TRANSFER GEARBOX SHIFT CONTROL SYSTEM

Use of the information below will allow the technician to understand and diagnose transfer gearbox shift control problems. The TCU will seldom fail on its own. The failure is usually caused by other components in the system. This document consists of three key sections:

1. System Information

^ General Description

^ Interface With Other Systems

2. Symptom Diagnosis

3. Diagnostic Checks And Repair Procedures

4. TCU Pin Layout

PARTS INFORMATION:

AMR6353 Transfer Gearbox Control Unit

STC1971 Shift Control Motor

5TC3277 Selector Shaft Seal

WARRANTY CLAIMS:

41.30.01 Time 0.40 hrs.
Replace Transfer Gearbox Shift Control Unit (TCU)

41.30.03 Time 0.45 hrs.
Replace Shift Control Motor

41.20.59 Time 0.60 hrs.

Replace Selector Shaft Seal (includes shift control motor replacement)

COMP CODE: 3X2P

Normal warranty policy and procedures apply