Engine Controls - Trouble Shooting - No Codes: Diagnosis Jaguar S-type I

SYMPTOM DIAGNOSIS

Symptom checks cannot be used properly unless the problem occurs while the vehicle is being tested. To reduce diagnostic time, ensure steps in BASIC DIAGNOSTIC PROCEDURES article and appropriate SELF-DIAGNOSTICS article were performed before diagnosing a symptom. Symptoms available for diagnosis include

1. «Detonation (Engine Knock)»(ref-11919-S20155829492000120400000)
2. «Difficult Start (Cranks Okay)»(ref-11919-S01642032502000120400000)
3. «Engine Backfires»(ref-11919-S37273627302000120400000)
4. «Engine Does Not Start (Fails To Rotate)»(ref-11919-S21053798432000120400000)
5. «Engine Fails To Idle»(ref-11919-S28625501072000120400000)
6. «Engine Rotates, But Fails To Start»(ref-11919-S37686822562000120400000)
7. «Engine Runs Rough (Off Idle)»(ref-11919-S09271396562000120400000)
8. «Engine Stalls»(ref-11919-S24844374732000120400000)
9. «Loss Of Power»(ref-11919-S11402613052000120400000)
10. «Rough Or Unstable Idle»(ref-11919-S00068545192000120400000)

INTERMITTENT PROBLEM DIAGNOSIS

Intermittent fault testing requires duplicating circuit or component failure to identify the problem. These procedures may lead to the computer setting a Diagnostic Trouble Code (DTC) which may help in diagnosis.

If problem vehicle does not produce a DTC, monitor voltage or resistance values using a Digital Volt-Ohmmeter (DVOM) while attempting to reproduce conditions causing intermittent fault. A status change on DVOM indicates a fault has been located.

Use a DVOM to pinpoint faults. When monitoring voltage, ensure ignition switch is in ON position or engine is running. Ensure ignition switch is in OFF position or negative battery cable is disconnected when monitoring circuit resistance. Status changes on DVOM during test procedures indicate area of fault.