gio Vyper 4WD 1100cc 4 seater XY1100UEL, Service Manual

Page: 238 / 261

11. EFI SYSTEM OF SQR 472ENGINE
11-66
3. The fault diagnosis according to the fault phenomena
In this note the fault appears after the preliminary examination
Before starting the engine fault diagnosis according to the fault phenomena should be the first step,
a preliminary inspection:
(1) Confirm the engine fault indicator light work;
(2) Diagnosis instrument for inspection to confirm the absence of fault, fault information record;
(3) Confirmed the existence of fault phenomena of complaints, and confirm that the failure
condition.
Then the visual inspection:
(1) Check whether the fuel pipeline leak;
(2) Check that the vacuum line whether there is fault, kink, the connection is correct;
(3) Check the intake pipeline is blocked, leakage, crushed or damaged;
(4) The high-pressure line check ignition system is broken, aging, ignition sequence is correct;
(5) Check the wiring harness ground is clean, firm;
(6) Check the sensor, actuator connector is loose or poor contact.
Important: if the above phenomenon exists, then the fault phenomenon of repair work, otherwise it
will affect the later
Fault diagnosis and repair work.
3.1. Starting when the engine does not turn or move slowly
General fault location:
1. The battery;
2. Starting motor;
3. Harness or ignition switch;
4. The engine mechanical part.
The general procedure of diagnosis: