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INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
IN--17
6. PROBLEM SYMPTOMS TABLE
The suspect circuits or parts for each problem symptom are shown in the table below. Use this table to trou-
bleshooting the problem when a ”Normal” code is displayed in the diagnostic trouble code check but the
problem is still occurring. Numbers in the table indicate the inspection order in which the circuits or parts
should be checked.
HINT:
When the problem is not detected by the diagnostic system even though the problem symptom is present,
it is considered that the problem is occurring outside the detection range of the diagnostic system, or that
the problem is occurring in a system other than the diagnostic system.
Symptom
Suspect Area
See page
Engine does not crank (Does not start)
No initial combustion (Does not start)
No complete combustion (Does not start)
1. Starter and starter relay
1. Engine ECU power source circuit
2. Fuel pump control circuit
3. Engine ECU
1. Starter signal circuit
2. Fuel pump control circuit
1. Fuel pump control circuit
ST--12, 13
DI--124
DI--127
IN--30
PROBLEM SYMPTOMS TABLE
1. Compression
2. Fuel pump control circuit
1. A/C signal circuit
2. Fuel pump control circuit
1. A/C signal circuit (Compressor circuit)
2. Engine ECU power source circuit
1. Starter signal circuit
2. Fuel pump control circuit
1. Starter signal circuit
2. Fuel pump control circuit
3. Compression
idling)
High engine idle speed (Poor idling)
Hot engine
Cold engine (Difficult to start)
Engine cranks normally (Difficult to start)
AC--54
DI--124
DI--121
DI--127
DI--121
DI--127
EM--3
DI--127
DI--121
DI--127
D
Problem Symptom
D
Page
Indicates the page where the flow chart for each circuit
is located.
D
Circuit Inspection, Inspection Order
Indicates the circuit which needs to be checked for each problem
symptom. Check in the order indicated by the numbers.
D
Circuit or Part Name
Indicates the circuit or part which needs to be checked.
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3RZ-F,3RZ-FE
