01

MAIN

IG1 Relay

To Ignition Switch

Battery

1,4 Cylinder Ignition Coil

2,3 Cylinder Ignition Coil

Engine 
Control 
Module

FE02-9000b

Engine

Ignition System JL4G18-D

2-523

2.10.7 Diagnostic Information and Procedures
2.10.7.1 Diagnosis Description

Refer to 

2.10.2.1

 

Description and Operation

Get familiar with the system functions and operation before start system diagnostics, so

that it will help to determine the correct troubleshooting steps, more importantly, it will also help to determine whether the customer
described situation is normal.

For the ignition system DTC code. Refer to the "control system diagnostic information and the steps" in the "

2.2.7.1

 

Diagnostic

Description

."

2.10.7.2 Visual Inspection

–

Check installed aftermarket equipment that may affect the ignition system performance.

–

Check the easy to access system components to identify whether there is significant damage or potential faults.

2.10.7.3 Check Ignition Switch

Check the ignition switch terminals continuity according to the following diagram

Ignition Switch

Terminal Logic Table

FE02-9001b

1.

Turn the ignition switch to "OFF" position.

2.

Disconnect the ignition switch wiring harness connector IP23.

3.

Remove the ignition switch assembly.

4.

Test ignition switch terminals continuity

Location

Related Terminal

Standard

OFF

All Terminals

Infinity

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Ignition System JL4G18-D

Engine

Location

Related Terminal

Standard

ACC

1-3

Conducted

ON

1-2-3

Conducted

5-6

ST

1-2

Conducted

4-5-6

If you detect there is one item that is not complying with standards, replace the ignition switch.

2.10.7.4 Ignition Relay IG1 No Power Output

Step 1

Check IG1 relay coil control power supply.

IF3

IF16

IF26

IF28

IF30

IF21

IF12

IF15

IF9

IF10

IF8

F17

F22

87

85

30

86

FE02-9002b

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove the ignition relay.

(c)

Turn the ignition switch to "ON" position.

(d)

Measure voltage between ignition relay IG1 terminal No.86
and a reliable ground.
Standard Voltage: 11-14 V
Is the voltage specified value?

No

Go to step 5

Yes

Step 2

Check IG1 relay coil ground circuit.

IF3

IF16

IF26

IF28

IF30

IF21

IF12

IF15

IF9

IF10

IF8

F17

F22

87

85

30

86

FE02-9003b

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove the ignition relay.

(c)

Measure resistance between ignition relay IG1 terminal No.
85 and a reliable ground.
Standard Resistance: Less than 1 Ω
Is the resistance specified value?

No

The circuit between the relay terminal No.85
and the ground is open.

Yes

Step 3

Check the relay power input.

Engine

Ignition System JL4G18-D

2-525

IF3

IF16

IF26

IF28

IF30

IF21

IF12

IF15

IF9

IF10

IF8

F17

F22

87

85

30

86

FE02-9004b

(a)

Turn the ignition switch to "OFF" position.

(b)

Remove ignition relay.

(c)

Measure voltage between ignition relay IG1 terminal No.87
and a reliable ground.
Standard Voltage: 11-14 V
Is the voltage specified value?

No

The circuit between the relay terminal No.87
and fuse EF22 is open.

Yes

Step 4

Replace the ignition relay IG1.

Step 5

Check ignition switch IG1 power output.

Ignition Switch

FE02-9005b

(a)

Turn the ignition switch to "ON" position.

(b)

Measure voltage between ignition switch harness connector
IP23 terminal No.2 and a reliable ground. (Note: During this
test, the ignition switch wiring harness connector can not be
disconnected).
Standard Voltage: 11-14 V
Is the voltage specified value?

No

Check the ignition switch, refer to
the

2.10.7.3

 

Check Ignition Switch

Yes

Step 6

The circuit between ignition switch wiring harness connector IP23 terminal No.2 and the ignition relay IG1
terminal No.86 is open.

Next

Step 7

Diagnostic completed.

2.10.7.5 Spark Plug Does Not Arcing

Note

Before carry out the Spark Plug do not arcing diagnostic, make sure that the engine anti-theft locking system is not
activated and working properly.

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Ignition System JL4G18-D

Engine