Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSJAGUAR1991XJ-6 L6-4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDIAGNOSTIC READOUT BOXDESCRIPTION AND OPERATION
1991 Jaguar XJ-6 L6-4.0L
Diagnostic Readout Box: Description and Operation
1991 Jaguar XJ-6 L6-4.0LSECTION Description and Operation
VCM 1 (Vehicle Condition Monitor) is the output signal to the instrumentation system indicating an engine management system fault.
VCM 2 is a dual purpose output signal to the instrumentation system:
1. Identifies individual engine management system faults when the ignition switch is first turned to position "II" after a fault is detected.
2. While engine is running, provides engine condition information to the trip computer.
VCM 2 is a dual purpose output signal to the instrumentation system:
1. Identifies individual engine management system faults when the ignition switch is first turned to position "II" after a fault is detected.
2. While engine is running, provides engine condition information to the trip computer.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.