Intermittent Failure Of Engine To Start (86/16/97/NAS)

WARNING: This page is about the Discovery SD, Automatic, which is a different variant/trim than selected.

Publication date: 1997-11-26
Reference number: 86/16/97/NAS

INTERMITTENT FAILURE OF ENGINE TO START

TECHNICAL SERVICE BULLETIN

Reference Number(s): 86/16/97/NAS, Date of Issue: November 26, 1997

LAND ROVER:	Discovery
REFERENCE:	WSM section 86
ISSUE:	3
SECTION:	Electrical
AFFECTED VEHICLES:	Discovery (LJ) - All GEMS Equipped

Superceded Bulletin(s): 86/16/97/NAS

NOTE: The information in this TIB supersedes the previous version of 86/16/97/NAS.

SITUATION

ENGINE CRANKS BUT WILL NOT START OR INTERMITTENTLY WILL NOT CRANK

Intermittently the vehicle may not crank or crank and not start. Some or all of the following symptoms may be present:

The "Check Engine" light does not illuminate when the key is turned to position II (run).
A delay of 3 to 5 seconds between turning the key to position III (crank) and engine cranking.
After turning the key off (position I) then on again, the vehicle starts normally.

RESOLUTION

MODIFICATION OF THE IMMOBILIZATION STRATEGY

The symptoms outlined indicate that the engine is temporarily immobilized due to a miscommunication between the security (10AS) ECU and GEMS ECM.

The technician must inspect and verify that two circuits and six electrical terminals are in good condition and working correctly as outlined in the repair instructions. When it is determined by the above electrical inspection that the fault is in the ECU, a security strategy modification can be performed to install the most current security ECU configuration. Use TestBook and the "Discovery Security Configuration" compact disk.

NOTE: The repairs outlined in this TIB are to be performed to resolve customer complaint of the symptoms described.

TOOL INFORMATION

Tool	Description	P/N
TestBook disk	Discovery Security Configuration	DRG0ROBW

Fig 1: Discovery Security Configuration TestBook Disk

WARRANTY CLAIMS

SRO	Description	Time
86.77.89/36	Verify Electrical connections and Install Current Immobilization Strategy using TestBook.	1.00 hrs.

COMP CODE: 7P6Y

Normal warranty policy and procedures apply.

REPAIR PROCEDURE

INSPECTION

Remove the terminals from the connector housings to inspect the pin and socket terminals and the quality of the wiring crimps for each of the following:

INSPECTION INFORMATION

Connector	Cavity	Color	Description/Location
C225	11	RS	Alarm ECU
C225	15	B	Alarm ECU
C1032	22	RS	GEMS ECM
C1017	26	B	GEMS ECM
C1027	11	RS	Behind the windshield washer reservoir
C1026	3	B	Behind the windshield washer reservoir

Cautiously deform each pin and socket to improve connection.
Assemble connectors.
Use an ohmmeter to verify the continuity between the following:
- C225 position 11 to C1032 position 22.
- C225 position 15 to C1017 position 26.
Verify that neither circuit is short-circuited to vehicle ground.
If the tests verify the circuits and connectors are functioning correctly, perform selection of current immobilization strategy using TestBook.

SELECTION OF CURRENT IMMOBILIZATION STRATEGY

CAUTION: Any repair procedure that replaces the 10AS ECU will cause the GEMS ECM to relearn the security code. Depending on the configuration of the 10AS ECU installed, the GEMS ECM may re-enable the early immobilization strategy.

NOTE: The "Discovery Security Configuration," CD can be used to install the most current 1998 level of vehicle security. The new level of security will eliminate the intermittent failure-to-start symptom experienced on some 1996 and 1997 vehicles. The 1998 level of security continues to activate the horn and the lights and continues to inhibit engine cranking.

Activate TestBook and access the Welcome Screen (Fig 2 ).

Fig 2: Welcome Screen
Insert the "Discovery Security Configuration" disk into TestBook and follow the on-screen prompts to install the current security strategy as follows:
- Select "DIAGNOSTIC SYSTEM."
- Select "DISCOVERY" and "SECURITY CONFIGURATION" at the Model Derivative Selection screen (Fig 3 ).
  
  Fig 3: Model Derivative Selection Screen
- Press "CONTINUE."
- Enter the 17-digit VIN at the VIN Entry Screen.
- Press "CONTINUE."
- Verify "Vehicle Information" screen data is correct.
- Press "CONTINUE."
- If current 1998 model year strategy is desired, select "NEW STRATEGY" at the System Selection screen (Fig 4 ).
  
  Fig 4: System Selection Screen
- If selection of 1996-97 strategy is desired, select "OLD STRATEGY."
- Follow the on-screen prompts carefully to complete the security strategy configuration (Fig 5 ).
  
  Fig 5: Completing Security Strategy Configuration