IN–26– INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
5. PROBLEM SYMPTOMS TABLE
The suspected circuits or parts for each problem symptom are shown in the table below. Use this table to
troubleshoot 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 AreaSee page
With the ignition switch in the ACC or ON position, the SRS warning
light sometimes lights up after approx. 6 seconds have elapsed.
SRS warning light is always lit up even when ignition switch is in
the LOCK position
With the ignition switch in the ACC or ON position, the SRS warning
light does not light up.
PROBLEM SYMPTOMS TABLE
DTC is not displayed.
SRS warning light is always lit up at the time of DTC check
procedure.
DTC is displayed without Tc and E1 terminal connection.DI–294 DI–290
Problem Symptom
Proceed with troubleshooting of each circuit in the table below.
SRS warning light circuit
(Always lights up when ignition switch is in
LOCK position.)
SRS warning light circuit
(Dose not light up when ignition switch is turned to
ACC or ON.)
Tc terminal circuit
DI–288
Circuit Inspection, Inspection Order
Indicates the circuit which needs to be checked for each problem
symptom. Check in the order indicated by the numbers. Page
Indicates the page where the flow chart for each circuit
is located.
Circuit or Part Name
Indicates the circuit or part which needs to be checked.
I01275
Ignition
Switch
BatterySender
Gauge Receiver
Gauge
I01276
Ignition
Switch
BatteryReceiver
Gauge
Test Bulb
(3.4 W)
I01277
Battery Ignition
SwitchWarning Light
Wire Harness Side
1
– BODY ELECTRICALCOMBINATION METER
BE–7
(b) Compare the tester and tachometer indications.
DC 13.5 V 25 C at (77F)
Standard indicationAllowable range
700630 – 770
1,000900 – 1,100
2,0001,850 – 2,150
3,0002,800 – 3,200
4,0003,800 – 4,200
5,0004,800 – 5,200
6,0005,750 – 6,250
7,0006,700 – 7,300
4. INSPECT ENGINE COOLANT TEMPERATURE RE-
CEIVER GAUGE OPERATION
(a) Disconnect the connector from the sender gauge.
(b) Turn the ignition switch ON and check that the receiver
gauge needle indicates COOL.
(c) Ground terminal on the wire harness side connector
through a 3.4 W test bulb.
(d) Turn the ignition switch ON, and check that the bulb lights
up and the receiver gauge needle moves to the hot side.
If operation is as specified, replace the sender gauge.
Then recheck the system.
If operation is not as specified, measure the receiver gauge re-
sistance.
5. INSPECT LOW OIL PRESSURE WARNING LIGHT
(a) Disconnect the connector from the warning switch and
ground terminal on the wire harness side connector.
(b) Turn the ignition switch ON and check that the warning
light lights up.
If the warning light does not light up, test the bulb.
