2002 Land Rover Range RoverFACTORY OEM SERVICE PROCEDURE

Engine Controls - Sensor Operating Range Charts: Introduction

Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems.

NOTE: Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
COMPONENT RESISTANCE VALUES (DISCOVERY SERIES II & RANGE ROVER)

Component Ohms @ 68°F (20°C)
Crankshaft Position (CKP) Sensor 1235-1365
EVAP Purge Control Valve 20-40
Fuel Injector (Bosch) 13.8-15.2
HO2S Heater 5.7
IAC Stepper Motor Coil 51-55
Ignition Coil (Bosch)
Primary Coil 0.45-0.55
Secondary Coil 12,000-14,600
Throttle Position Sensor 3200-4800
Fig 1: Engine Coolant Temperature Sensor Output Values (Discovery Series II & Range Rover)
G99I52660Courtesy of LAND ROVER NORTH AMERICA, INC.
FUEL INJECTOR RESISTANCE

Application Ohms @ 68°F (20°C)
Discovery Series II & Range Rover 13.8-15.2
Freelander 13-16
FUEL TANK SENDING UNIT RESISTANCE (DISCOVERY SERIES II & RANGE ROVER)

Fuel Gauge Reading Approximate Fuel Tank Volume Gals. (L) Sender Unit Resistance Ohms
FULL 25 (95) (1) 15-19
3/4 18.8 (71) 36
1/2 12.7 (48) 64
1/4 6.4 (24) 110
RESERVE (Fuel Light ON) 2.9 (11) (2) 146-158
EMPTY Zero (0) (3) 245-270
(1) When the fuel gauge registers FULL the sender unit resistance should be approximately 15-19 ohms and the output voltage should be approximately one volt.
(2) Low fuel indicator light will illuminate when the sender unit resistance is more than 175 ohms and the output voltage is approximately 2.77 volts. Low fuel indicator light will go out when sender unit resistance is less than 117 ohms and the output voltage is approximately 2.40 volts.
(3) When the fuel gauge resisters EMPTY the sender unit resistance should be approximately 245-270 ohms and the output voltage should approximately 3.16 volts.
FUEL TANK SENDING UNIT RESISTANCE (FREELANDER)

Fuel Gauge Reading Sender Unit Resistance Ohms
FULL 135
1/2 302
RESERVE (Fuel Light ON) 413
EMPTY 503
HEATED OXYGEN SENSOR (HO2S) OUTPUT VOLTAGE (DISCOVERY SERIES II & RANGE ROVER)

Component Volts
Primary HO2S (1) 100-900 mV
Secondary HO2S (2) 200-650 mV
(1) Voltage should switch from high to low and back at approximately 0.5 Hz.
(2) Voltage should be static or change high to low and back slowly.
HO2S HEATER ELEMENT RESISTANCE (FREELANDER)

Component Ohms @ 68°F (20°C)
Primary & Secondary HO2S 6
THROTTLE POSITION SENSOR VOLTAGE (DISCOVERY SERIES II & RANGE ROVER)

TP Sensor Position Volts
Minimum Zero
Idle 0.3-0.5
Wide Open Throttle (WOT) 4.5
Maximum 5.0
THROTTLE POSITION SENSOR VOLTAGE SPECIFICATIONS (FREELANDER)

Application Voltage
TP Sensor 1
Closed Throttle Approx. 0.5
Wide Open Throttle (WOT) Approx. 4.5
TP Sensor 2 (1)
Closed Throttle Approx. 4.5
Wide Open Throttle (WOT) Approx. 0.5
(1) TP sensor 2 is used as a plausability check for TP sensor 1.
Fig 2: Intake Air Temperature (IAT) Sensor Output Values (Discovery Series II & Range Rover)
G99A52662Courtesy of LAND ROVER NORTH AMERICA, INC.
Factory Service Tools

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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.