Electronic Throttle System

1. The diagnostics socket (black) is located below the righthand front seat.
2. During fault diagnosis, the ignition switch must always be in Drive position.
3. The ISAT system number for the ETS system is number 3.
4. Always read off and note down all stored fault codes before disconnecting the battery or ECU.
5. If communication cannot be established between ISAT and the ECU, check leads between ECU pins 9 and 34 and the diagnostics socket. Also check the power feed and ground circuits to the diagnostics socket and the ECU are good and the connector pins are not damaged.
6. Once fault codes stored in the systems's ECU have been transferred to ISAT, the diagnosis function is finished. The technician should next enter any command codes which apply to the problem which exists. It is sometimes quite helpful to enter All command codes to check the status of certain signals and components before proceeding with the detailed diagnostic procedure.
7. To avoid damaging the ECU, ensure the ignition is off before disconnecting the connector.
8. Prior to tracing faults on a vehicle's electronic systems, always checking that the grounding circuits for the ECU concerned are good and that all nominal voltage levels are correct.
9. Disconnect connectors and plugs to check the pins are undamaged and not loose. After checking, plug in all connectors and clear all fault codes. Start engine or drive car again to check that the fault or faults persist.
10. When first detected, a fault will be assigned a permanent fault code. If the fault later disappears, the fault will be classified as intermittent.
11. All signals around the 12 volt level are proportional to battery voltage. These levels must therefore be taken only as a rough guide.
12. Zero voltage signal levels indicate ground, although a sensitive multimeter may indicate a value slightly above zero volts.
13. If a system fault occurs, the system relay cuts off power supply to the ECU and other components.
14. All fault codes starting with a 4 or 5 denote permanent faults; a 2 or 3 at the beginning indicates an intermittent fault.