Lotus Elise Service Notes page 595

Lotus Service Notes
Exige
Engine Management
The engine management electronic controller is common with the Esprit V8 and uses some of that
model's components, including:
Idle Air Control (IAC) valve; mounted on the rear of the engine and connected by hose between the
intake airbox backplate and ports in the underside of each inlet manifold tract.
Ignition Coil Pack; one of the two identical V8 coil packs, mounted on the rear of the cylinder head.
Electronic Control Module (ECM); mounted on the cabin rear bulkhead - controls engine management
systems including fully sequential injection and direct ignition.
Manifold Air Pressure (MAP) and Barometric pressure (BARO) sensors; mounted on the engine bay LH
wall.
A vehicle speed signal is provided for the ECM from a new wheel speed sensor mounted on the RH rear
hub carrier. The LH hub carrier sensor is retained for speedometer data. Note for reference, that the 340R
uses only the LH sensor, but splits the signal to speedo and engine ECM in the instrument controller.
Other engine management components are as standard Elise.
The OBD2 (On Board Diagnostics version 2) connector socket is located within the electronics box on
the cabin rear bulkhead. For fault diagnosis, the 'Tech 1' tool, including the Esprit V8 cartridge, should be
plugged into this socket, and any trouble codes read in conjunction with Service Notes manual 'Section EMM'.
A limited range of trouble codes are available:
Trouble Code Description
P0107 Manifold Absolute Pressure Circuit low input
P0108
Manifold Absolute Pressure Circuit high input
P0112
Intake Air Temperature Circuit low input
P0113 Intake Air Temperature Circuit high input
P0117
Engine Coolant Temperature Circuit low input
P0118
Engine Coolant Temperature Circuit high input
P0122 Throttle Position Circuit low input
P0123 Throttle Position Circuit high input
P0131 Oxygen Sensor Circuit low voltage
P0132 Oxygen Sensor
Circuit high voltage
P0201 Injector Circuit Malfunction Cylinder 1
P0203 Injector Circuit Malfunction
Cylinder 3
P0205
Injector Circuit Malfunction Cylinder 4
P0207 Injector Circuit Malfunction Cylinder 2
P0601 ECM Integrity
Watchdog
P0606 ECM Integrity
Checksum
P1100 Fuel Pump Relay or ciruit open
P1101 Fuel Pump
Relay or ciruit shorted
P1106 Barometric Pressure
Circuit range/performance problem
P1107 Barometric Pressure Circuit low input
P1108 Barometric Pressure Circuit high input
P1420 Battery Voltage Too high
P1421
Battery Voltage
Too low
P1501
Resonator Valve
Not closing
P1502 Resonator Valve Not opening
Page 12
2000 / 03