XJR (X300) L6-4.0L SC (AJ16) (1995)
Oil Pressure Gauge: Testing and Inspection
Gauge reads zero, full scale, too high or low
1. Oil pressure and coolant gauges only; check relevant fluid level is within limits, top up if required and re-check indication. If fluid levels are within
limits on checking proceed to step 2.
2. Check connections to sensor are correct and secure. For battery gauge only check battery voltage is present at the battery terminal posts.
3. Check resistance of sensor (if applicable) to ground, correct readings are as detailed in the following table:
Sensor title
Resistance valve
Oil pressure
310 Ohm - 330 Ohm
Temperature
34 Ohm (warm engine) - 241 Ohm (cold engine)
Fuel level
80 Ohm (full tank) - 900 Ohm (empty tank)
If resistance is out of range renew sensor.
4. If sensor resistance is proved correct, check the harness wiring continuity between the sensor and instrument pack pin as detailed in the table
below:
Sensor title
Instrument pack pin
Oil pressure
o/c engine stopped, s/c engine running
Temperature
19 (24-way connector)
Fuel level
20 (24-way connector)
For battery condition gauge, check voltage between instrument pack 24-way connector pins 2 and 4 is 13 +/- 2.5V.
5. If all previous checks prove correct remove and open the instrument pack. Examine flex-circuit connections to relevant gauge, ensuring correct
and secure figment.
6. Check continuity of flex-circuit tracks to gauge connections.
7. Check continuity of gauge driver windings by disconnecting gauge from flexi-circuit and testing between the upper central connection pin and
each of the other two pins./open circuit is recorded renew gauge.
Gauge fluctuates or gives erratic readings
1. Carry out steps 1-4 above.
2. Fit new sensor (where applicable) and re-check gauge.
3. Carry out steps 5-7 above.