We have installed an Ultra-gauge to provide engine management information from the OBDII diagnostic port located under the steering wheel. The ultra-gauge is able to connect with Sterlin’s on board computer and obtain real-time engine management information and diagnostic fault codes, even while the car’s being driven.
Here are some of the more useful things that we can obtain from the OBDII interface (listed in order of most useful to least useful:-
Real-time fuel consumption rate estimates. The Land Rover Discovery II never included any on board computer display, so simple information like fuel consumption rate can not be displayed. Fortunately the on board computer actually calculates this.
Actual engine coolant temperature. The Land Rover Discovery temperature gauge does not work very well and basically indicates a normal temperature on the dashboard (needle pointing exactly half way between hot and cold extremes) even if the coolant temperature is above normal. The OBDII interface provides the actual temperature and the iPhone application is set to sound an alarm when it exceeds custom thresholds. We have set the thresholds initially at 104°C or 220°F.
Read engine fault codes. We have owned Sterlin for 10 years and the engine check light has never come on. But if it did, the ultra-gauge would be able to indicate the fault code and cause of the indication. Presumably this is useful in vehicle diagnostics. Attached is a file with all the known Land Rover Discovery II engine fault codes.
Estimated remaining range in the fuel tank. In addition to the fuel gauge, another method to estimate when to fuel up.
Fault Code Information
The following fault information was sourced from here.
When an OBD-II fault occurs in Land Rover’s Generic Engine Management System (GEMS), the Malfunction Indicator Lamp (MIL) is illuminated. GEMS Diagnostic Trouble Codes (DTC ) are stored in the Engine Control Module (ECM ) and may be retrieved by connecting a suitable OBD II Scan Tool or the Land Rover TestBook Electronic Tester to the Data Link Connector (DLC ). DTC’s can only be Extracted, Diagnosed and Cleared by the TestBook Diagnostic Unit, a required special tool , or an appropriate after market equivalent.
All information regarding DTC’s for this model is contained within the Land Rover TestBook Diagnostic Unit. The manufacturer does not provide any other information on pulling codes, descriptions, diagnosis, clear codes, etc.
*Codes* are used to identify the 4 Oxygen Sensors.
- A = Bank A of the engine. Cylinder #1 is located on Engine Bank A.
- B = Bank B of the engine.
- U = Upstream of the Catalytic Converter.
- D = Downstream of the Catalytic Converter.
Example: A D = Oxygen Sensor Engine Bank A, Downstream of Catalytic Converter.
| P0101 | Mass Air Flow Sensor Signal Error Fault |
| P0102 | Mass Air Flow Sensor Low Out of Range Fault |
| P0103 | Mass Air Flow Sensor High Out of Range Fault |
| P0111 | Air Temperature Sensor Signal Error Fault |
| P0112 | Air Temperature Sensor Low Out of Range Fault |
| P0113 | Air Temperature Sensor High Out of Range Fault |
| P0116 | Engine Coolant Temperature Sensor Falling Temp Fault |
| P0117 | Engine Coolant Temperature Sensor Low Out of Range Fault |
| P0118 | Engine Coolant Temperature Sensor High Out of Range Fault |
| P0121 | Throttle Position Sensor Output Signal Error Fault |
| P0122 | Throttle Position Sensor Low Out of Range Fault |
| P0123 | Throttle Position Sensor High Out of Range Fault |
| P0125 | Engine Coolant Temp Sensor Warm Up Fault |
| P0130 | Oxygen Sensor Cycle Fault *Codes* A U |
| P0131 | Oxygen Sensor Low Voltage *Codes* A U |
| P0132 | Oxygen Sensor High Voltage *Codes* A U |
| P0133 | Oxygen Sensor Slow Response *Codes* A U |
| P0136 | Oxygen Sensor Cycle Fault *Codes* A D |
| P0137 | Oxygen Sensor Low Voltage *Codes* A D |
| P0138 | Oxygen Sensor High Voltage *Codes* A D |
| P0139 | Oxygen Sensor Slow Response *Codes* A D |
| P0150 | Oxygen Sensor Cycle Fault *Codes* B U |
| P0151 | Oxygen Sensor Low Voltage *Codes* B U |
| P0152 | Oxygen Sensor High Voltage *Codes* B U |
| P0153 | Oxygen Sensor Slow Response *Codes* B U |
| P0156 | Oxygen Sensor Cycle Fault *Codes* B D |
| P0157 | Oxygen Sensor Low Voltage *Codes* B D |
| P0158 | Oxygen Sensor High Voltage *Codes* B D |
| P0159 | Oxygen Sensor Slow Response *Codes* B D |
| P0171 | Oxygen Sensor System Too Lean Fault Bank A |
| P0172 | Oxygen Sensor System Too Rich Fault Bank A |
| P0174 | Oxygen Sensor System Too Lean Fault Bank B |
| P0175 | Oxygen Sensor System Too Rich Fault Bank B |
| P0181 | Fuel Temperature Sensor Signal Error Fault |
| P0182 | Fuel Temperature Sensor Low Out of Range Fault |
| P0183 | Fuel Temperature Sensor High Out of Range Fault |
| P0201 | Injector 1 Circuit Fault |
| P0202 | Injector 2 Circuit Fault |
| P0203 | Injector 3 Circuit Fault |
| P0204 | Injector 4 Circuit Fault |
| P0205 | Injector 5 Circuit Fault |
| P0206 | Injector 6 Circuit Fault |
| P0207 | Injector 7 Circuit Fault |
| P0208 | Injector 8 Circuit Fault |
| P0300 | Misfire On Multiple Cylinder |
| P0301 | Misfire Cylinder 1 |
| P03O2 | Misfire Cylinder 2 |
| P03O3 | Misfire Cylinder 3 |
| P0304 | Misfire Cylinder 4 |
| P0305 | Misfire Cylinder 5 |
| P0306 | Misfire Cylinder 6 |
| P0307 | Misfire Cylinder 7 |
| P0308 | Misfire Cylinder 8 |
| P0326 | Continuous Knock Fault Bank A |
| P0327 | Background Noise Low Fault Bank A |
| P0328 | Background Noise High Fault Bank A |
| P0331 | Continuous Knock Fault Bank B |
| P0332 | Background Noise Low Fault Bank B |
| P0333 | Background Noise High Fault Bank B |
| P0335 | Crankshaft Position Sensor Signal Error Fault |
| P0336 | Crankshaft Position Sensor Out of Range Fault |
| P0340 | Camshaft Position Sensor Signal Error Fault |
| P0420 | Catalyst Efficiency Low Fault Bank A |
| P0430 | Catalyst Efficiency Low Fault Bank B |
| P0441 | Evap Purge Valve Incorrect Flow Fault |
| P0442 | Evap System Small Leak Detected Fault |
| P0443 | Evap Purge Valve Open or Short Circuit Fault |
| P0451 | Fuel Tank Pressure Sensor Signal Error Fault |
| P0452 | Fuel Tank Pressure Sensor Low out of Range Fault |
| P0453 | Fuel Tank Pressure Sensor High Out of Range Fault |
| P0461 | Fuel Tank Level Measurement Not Valid Fault |
| P0500 | Vehicle Speed Sensor Signal Error Fault |
| P0506 | Idle Speed Control Engine Speed Low Fault |
| P0507 | Idle Speed Control Engine Speed High Fault |
| P0560 | Battery Voltage Below Minimum Fault |
| P0562 | Measurement Circuit OK Battery Voltage Low Fault |
| P0563 | Battery Voltage Above Maximum Fault |
| P0605 | ECM Self Test Fault |
| P1130 | Oxygen Sensor Fuel Trim at Limit *Codes* A U |
| P1131 | Oxygen Sensor Engine Lean *Codes* A U |
| P1132 | Oxygen Sensor Engine Rich *Codes* A U |
| P1137 | Oxygen Sensor Engine Lean *Codes* A D |
| P1138 | Oxygen Sensor Engine Rich *Codes* A D |
| P1150 | Oxygen Sensor Fuel Trim at Limit *Codes* B U |
| P1151 | Oxygen Sensor Engine Lean *Codes* B U |
| P1152 | Oxygen Sensor Engine Rich *Codes* B U |
| P1157 | Oxygen Sensor Engine Lean *Codes* B D |
| P1158 | Oxygen Sensor Engine Rich *Codes* B D |
| P1171 | Oxygen Sensor System Too Lean Fault Banks A & B |
| P1172 | Oxygen Sensor System Too Rich Fault Banks A & B |
| P1176 | Maximum Positive FMFR Correction Fault |
| P1177 | Maximum Negative FMFR Correction Fault |
| P1178 | Maximum Positive AMFR Correction Fault |
| P1179 | Maximum Negative AMFR Correction Fault |
| P1185 | Oxygen Sensor Heater Circuit Open Upstream |
| P1186 | Oxygen Sensor Heater Circuit Short Upstream |
| P1187 | Oxygen Sensor Heater Circuit Short Upstream |
| P1188 | Oxygen Sensor Heater High Resistance Upstream |
| P1189 | Oxygen Sensor Heater Type 1 Low Resistance Upstream |
| P1190 | Oxygen Sensor Heater Type 2 Low Resistance Upstream |
| P1191 | Oxygen Sensor Heater Circuit Open Downstream |
| P1192 | Oxygen Sensor Heater Circuit Short Downstream |
| P1193 | Oxygen Sensor Heater Circuit Open Downstream |
| P1194 | Oxygen Sensor Heater High Resistance Downstream |
| P1195 | Oxygen Sensor Heater Type 1 Low Resistance Downstream |
| P1196 | Oxygen Sensor Heater Type 2 Low Resistance Downstream |
| P1199 | Fuel Level Sensor Circuit Fault |
| P1201 | Injector 1 Open Circuit or Ground Short Fault |
| P1202 | Injector 2 Open Circuit or Ground Short Fault |
| P1203 | Injector 3 Open Circuit or Ground Short Fault |
| P1204 | Injector 4 Open Circuit or Ground Short Fault |
| P1205 | Injector 5 Open Circuit or Ground Short Fault |
| P1206 | Injector 6 Open Circuit or Ground Short Fault |
| P1207 | Injector 7 Open Circuit or Ground Short Fault |
| P1208 | Injector 8 Open Circuit or Ground Short Fault |
| P1313 | Misfire Catalyst Damage Fault Bank A |
| P1314 | Misfire Catalyst Damage Fault Bank B |
| P1315 | Misfire Persistent Fault |
| P1316 | Misfire Excessive Emissions Fault |
| P1317 | ABS Rough Road Line Low Fault |
| P1318 | ABS Rough Road Line High Fault |
| P1361 | No Ignition Coil Activation Fault Coil 1 |
| P1362 | No Ignition Coil Activation Fault Coil 2 |
| P1363 | No Ignition Coil Activation Fault Coil 3 |
| P1364 | No Ignition Coil Activation Fault Coil 4 |
| P1371 | Early Ignition Coil Activation Fault Coil 1 |
| P1372 | Early Ignition Coil Activation Fault Coil 2 |
| P1373 | Early Ignition Coil Activation Fault Coil 3 |
| P1374 | Early Ignition Coil Activation Fault Coil 4 |
| P1440 | Evap System Purge Valve Stuck Open Fault |
| P1441 | Evap System Purge Valve Flow 1 Fault |
| P1442 | Evap System Purge Valve Blocked Fault |
| P1447 | Evap System Purge Valve Open or Short Circuit Fault |
| P1448 | Evap System Purge Valve Flow 2 Fault |
| P1508 | Idle Speed Control Open Circuit Fault |
| P15O9 | Idle Speed Control Short Circuit Fault |
| P1514 | Neutral Drive Load Fault |
| P1516 | Neutral Drive Gear Change Fault |
| P1517 | Neutral Drive Cranking Fault |
| P1607 | Malfunction Indicator Lamp Short Circuit Fault |
| P1608 | Malfunction Indicator Lamp Open Circuit Fault |
| P1620 | Reprogramming Code Learn Fault |
| P1621 | Serial Data Link Dead Fault |
| P1622 | Repeated Wrong ECM Security Code Fault |
| P1623 | ECM Security Code Fault |
| P1701 | Transfer Box Line Fault |
| P1703 | Transfer Box Line Open Circuit Fault |
| P1708 | Transfer Box Line Short Circuit Fault |
| P1775 | Gearbox Fault |
| P1776 | Gearbox Ignition Retard Request Timeout Fault |
| P1777 | Gearbox Ignition Retard Request Line Fault |
