2.10 Ignition System 

2.10.1 Specifications 

2.10.1.1 Fastener Specifications 

Tightening Torque 

Fastener Name 

Specification 

Metric (N.m) 

English system 
(lb-ft) 

Camshaft Position Sensor 
Mounting Bolt 

M6×14 

9±1

 

6-7 . 4 

Fixing Bolts of Ignition Coil 

M6×20

 

9±1

 

6-7 . 4 

Spark Plug 

M14×1.25 

25±3 

16.1-20.5 

Knock Sensor 

M8×40 

19±2 

12.5-15.4 

 

2.10.1.2 Ignition System Specification 

 

Applications Specification 

Ignition Sequence 

1±-3/-4±-2 

Ignition Timing 

7° before TDC 

Ignition Type 

Spark Discharge 

Spark Plug Gap 

0.8-0.9 

Spark Plug Manufacturer 

Zhuzhou Torch Spark Plug Co., Ltd. 

Spark Plug Model 

K6RTC 

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2.10.2 Description and Operation 

2.10.2.1 Description and Operation 

This vehicle uses DLI ignition system for igniting two cylinders at the same time distributor. The 
ignition voltage is sent directly from the ignition coil to the spark plug. Main system components 
are ECM, two ignition coils, high voltage damper, spark plug, crankshaft position sensor, camshaft 
position sensor, knock sensor etc.. This Ignition system without distributor is known as the direct 
ignition type. Cylinder No.1 is paired with Cylinder No.4 and Cylinder No.2 is paired with 
Cylinder No.3. When ECM triggers the ignition coil to ignite, spark occurs in both cylinders at the 
same time. At this time one cylinder is in compression stroke and the other is in exhaust stroke. 
For the cylinder in the exhaust stroke, because the cylinder pressure is low, the temperature is high, 
the spark plug only requires minimal energy to break ignition voltage gap. It is an invalid ignition, 
the remaining energy is used by the spark plug in the compression stroke cylinder. 

As a result of using DLI Ignition System without distributor, ECM controls the best ignition 
timing based on a variety of load conditions, so that the engine output power, acceleration, 
economy and emission performance have reached the ideal situations. The ignition system voltage 
does not decrease as the speed increases. In the absence of mechanical components, there is 
mechanical error. 

The ignition coil can not be repaired and it must be replaced as an assembly.

 

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2.10.3 System operating principle 

2.10.3.1 System operating Principle 

When the ignition switch is at the “ON” or “ST” position, the #5 terminal and #6 terminal of the 
ignition switch connector IP45 are connected to supply the power for the #68 terminal of ECM. 
When the ECM detects the voltage at the #68 terminal, it will be grounded via the #2 and #3 
terminals of the ECM harness connectors to control the pull-in of the main relay, generating a 
complete loop in the primary relay coil. Battery voltage power the ignition coil passing through 
the EF40 fuse, main relay and EF21 fuse. 

Crankshaft position sensor is a magnetic inductive speed sensor. Crankshaft position sensor signal 
plate and the flywheel is an integrated part. When the engine rotates, so does the crankshaft 
position sensor signal drive plate. So the sensor produces an alternating signal. This signal is 
transmitted to ECM. ECM calculates the current crank angle based on this signal in order to 
determine the piston reaches the TDC, directly affecting the accuracy of the ignition advance 
angle control. This sensor signal is a crucial input signal in the ignition system. When ECM can 
not receive the signal, the ignition system can not work. ECM harness connector EM01 terminals 
#30 and #11 receive crankshaft position sensor input. After calculation, ECM obtains the ignition 
advance angle. ECM harness connector EM01 terminal No.4 controls cylinders #1 ignition, 
terminal #81 controls cylinder #2 ignition, terminal #1 controls cylinder #3 ignition and terminal 
#82 controls cylinder 4 ignition. 

Refer to the 2.2.1.2 Temperature and Resistance Correlation of Temperature Sensor for the 
specific parameters of crankshaft position sensor. 

Refer to the 2.2.1.2 Temperature and Resistance Correlation of Temperature Sensor for the 
specific technology parameters of knock sensor. 

Note: When the vehicle Anti-theft alarm system and engine anti-theft locking system are 
activated, ECM does not allow ignition coil to be ignited. The ignition system is inoperative at 
this time. 

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2.10.4 Part position figure

 

2.10.4.1 Part position figure 

5

4

2

1

3

NL02-1006e

 

1. Ignition 

Coil 

2. Knock 

Sensor 

3.  Camshaft Position Sensor 

4.  Vehicle speed sensor 

5. Spark 

plug 

610