Information Summary and Preparation
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1-7 Trouble shooting
Procedure to maintain the Electronic Management System (EMS)
Systematic procedure to diagnose any troubles for reparation
Items to be checked first prior to any diagnoses for engine troubles:
1. Make sure of the engine trouble indicator normally running;
2. Check with a trouble diagnosis meter to ensure no trouble information recorded;
3. Check any trouble phenomenon hinted by the vehicle owner and trouble-related conditions.
External check:
(1)
Check any leakage from a fuel hose.
(2)
Check any leakage from a vacuum pipe.
(3)
Check any jam, leakage, flattening, or damage at an air inlet.
(4)
Check the ignition system for break or aging of any high-voltage cable and ignition
status.
(5)
Check grounding of any wire harness clean and securely fixed.
(6)
Check any sensor or actuator’s connector loosened or poorly contacted.
Note: Repair any trouble specified herein first which may affect the subsequent diagnoses or
reparation.
Diagnosis assist:
1. Make sure of no engine-related trouble records;
2. Make sure of any offered troubles;
3. Follow the said procedure to complete inspections and find no any unconformable situation;
4. Do not ignore any effect from maintenance, cylinder pressure, mechanical timing, or fuel on
the system;
5. Replace ECU for tests.
In the event of any trouble eliminated, ECU should be the source of trouble; if not, install the
original ECU and repeat the procedure to recheck.
Trouble:
Engine not running or slowly running during start-up
Engine running but start-up failing during start-up
Trouble of hot start
Trouble of cold start
Trouble of start-up anytime despite RPM normal
Start-up normal but idle speed unstable anytime
Start-up normal but idle speed unstable during warm-up
Start-up normal but idle speed unstable with warm-up finished
Start-up normal but idle speed unstable or stall with load such as front lamp applied
Start-up normal but idle speed too high
RPM low or stall during acceleration
Acceleration slow
Acceleration powerless; performance bad
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