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Engine Control - Driveability Diagnosis Information

303-43

DATE 04/01

V8 XJ Series/XK

MODEL
1997-98 MY XK8 Range
1998 MY V8 XJ Series VIN 1998-99 MY XJR

Drivability Diagnosis - AJ 26 Engines

Issue:

This Technical Bulletin has been issued to give diagnostic information relating to various engine drivability concerns. Driven by the symptoms that the customer experiences, the guide takes you through the faultfinding process in a logical order.

Note:
Diagnostic guides covering over engine concerns will follow.

Action:

Before using the guide, check the symptom Matrix shown for the diagnostic flowchart sequence. For example, if the engine cuts-out soon after start, work through flow charts P3, P2, P1, P5 etc.. Following the flowcharts in the sequence identified will help rectify any concerns while optimizing the utilization of workshop time.

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





RELAY CODES AND DATE STAMPS





SYMPTOM MATRIX





P1 - CONTAMINATED THROTTLE DIAGNOSTIC FLOW CHART





P2 - ECM RELAY DIAGNOSTIC FLOW CHART





P3 - FUEL PUMP RELAY DIAGNOSTIC FLOW CHART





P4 - IMMOBILIZATION (STALL SITUATION) DIAGNOSTIC FLOW CHART





P4 - IMMOBILIZATION (STALL SITUATION) DIAGNOSTIC FLOW CHART - IGNITION INPUTS











P5 - DTC 1336 DIAGNOSTIC FLOW CHART





P5 - DTC 1336 - ADDITIONAL INFORMATION





P14 - ENGINE HARNESS DIAGNOSTIC FLOW CHART





P17 - FUEL PUMP DIAGNOSTIC FLOW CHART











P18 - ENGINE COOLANT TEMPERATURE SENSOR DIAGNOSTIC FLOW CHART





P18 - ENGINE COOLANT TEMPERATURE SENSOR - RESISTANCE VALUES





P19 - MASS AIR FLOW SENSOR DIAGNOSTIC FLOW CHART











P20 - FUEL PRESSURE REGULATOR DIAGNOSTIC FLOW CHART








P21 - FUEL LINES DIAGNOSTIC FLOW CHART








P23 - AIR LEAKAGE DIAGNOSTIC FLOW CHART








P29 - BLOCKED PART LOAD BREATHER CLEANING PROCEDURE





PDU EXPLANATION FLOW CHART GUIDED - DIAGNOSTICS





PDU EXPLANATION FLOW CHART - TOOLBOX





PDU EXPLANATION FLOW CHART - MULTIMETER