Engine Controls - Hard/No Start Diagnostic Flowcharts

303-55

V8 XJ Series/XK

DATE: 06/02

MODEL
1997-98 MY XK Range
1998 MY V8 XJ Series

VIN
1998-99 XJR
001001-031302
812256-878717

Hard Start/Non Start Condition - AJ26 Engines - Diagnostic Flowcharts

Issue:

This bulletin provides diagnostic information organized by symptom.

Action:

Before using the guide, check the Symptom Matrix as shown for the diagnostic flowchart sequence. For example, if the engine does not crank, work through flow charts P6, P2, P10, P11 etc... Following the flowcharts in the sequence identified will help rectify any concerns while optimizing the utilization of workshop time.

Caution:
When working on any vehicle ensure that exposed paintwork is protected with the appropriate fender protection covers.

ADDITIONAL INFORMATION

Relay codes and date stamps

Relay date codes come in two forms:

^ Relays prior to December 1998 have the format: Letter - Number - Letter i.e. R6 K1

^ Relays post December 1998 have the format: Number - Letter - Letter i.e. 2AB

All date codes are printed in white on the top face of the relay, adjacent to the part number.

A Fuel Systems Warning:
Working on the fuel system can result in fuel vapor being emitted into the atmosphere. Fuel vapor is extremely flammable; hence great care should be taken when working on the fuel system. Do not smoke in the working area and ensure that there is a C02 fire extinguisher close by. The working area must be well ventilated and extraction equipment used when appropriate. When emptying fuel, use suitable fireproof equipment and an authorized explosion-proof container.

P1 - Contaminated Throttle Diagnostic Flowchart

P2 - ECM Relay Diagnostic Flowcharts

P3 - Fuel Pump Relay Test Diagnostic Flowchart

P4a - Immobilization Non Start Diagnostic Flowchart

P5 - DTC P1336 Crankshaft and Camshaft Sensor Diagnostic Flowchart

P5 - Additional Information

Resistance is measured in Ohms at the engine management connector EM013:

1. Disconnect the engine management connector EM013.

2. Check the resistance between pin 019 and pin 028 (sensor ground crankshaft position sensor).

3. You should get a reading between the parameters (see table) for the relative temperature.

Resistance is measured in Ohms at the engine management connector EM013:

1. Disconnect the engine management connector EM013.

2. Check the resistance between pin 020 and pin 029 (sensor ground camshaft position sensor).

3. You should get a reading between the parameters (see table) for the relative temperature.

Crank and Cam Sensor signals are displayed on WDS:

See Illustration 1 for an example of a good crank signal as seen on the WDS oscilloscope.

Note:
The oscilloscope was set to 1 volt/div and 10 ms/div. The gap in the waveform represents the missing tooth on the flywheel.

See Illustration 2 for an example of a good cam signal as seen on the WDS oscilloscope

Note:
The oscilloscope was set to 1 volt/div and 50 ms/div.