XJ-12 (X300) V12-6.0L (1995)
Throttle Position Sensor: Adjustments
NOTE: Perform Basic Function Check before attempting to adjust the throttle position sensor. See: Testing and Inspection
Fig. 1
Fig. 2
Setting / Adjustment
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Connect two digital voltmeters into the vehicle circuit as shown, without breaking the existing circuit.
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Set DVM ranges to "VOLTAGE". DVM 1 on 0-2V range (O.OO1mV resolution), DVM 2 on 0 - 20V range.
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Ensure the pedestal is fully closed, i.e. on the mechanical stop.
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Turn ignition on and record voltage reading at DVM 1, DVM 2 should read below 20mV.
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Rotate the throttle pulley very gently towards open, noting the point where DVM 2 reading changes abruptly to above 11v, indicating idle switch
open. Record DVM 1 reading at this point.
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Subtract the first DVM 1 reading from the second, a correctly adjusted TPS will give a resulting value of 44 - 54mV.
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If result is outside the stated range slacken the TPS securing screws (6 ) and turn TPS slightly with respect to the pedestal.
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Repeat the adjustment procedure until voltage reading is within the required range.
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Re-tighten screws (6 ) and re-check voltage reading is in range.
NOTE: Angular checks (using feeler gauges) or resistance checks will not be accurate and must not be relied upon.
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Remove DVMs.