(f)

Read control system DTC code again to confirm that the
system has no DTC code.

No

Intermittent Fault. Refer to

2.12.7.3

 

Intermittent Fault Check

Yes

Step 4

Check ECM power supply circuit and ground circuit.

(a)

Check ECM power supply circuit and ground circuit. Refer
to "

2.12.7.43

 

DTC P0562 P0563

.

ECM power and ground circuits normal?

No

Power and ground circuits fault.

Yes

Step 5

Replace ECM. Refer to 

2.2.8.8

 

Engine Control Module Replacement

.

Next

Step 6

Carry out crankshaft position sensor learn. Refer to 

2.12.7.11

 

Crankshaft Position Sensor (CKP) Learn

.

Next

Step 7

Use scan tool to confirm whether the DTC code is stored again.

(a)

Connect scan tool to the datalink connector.

(b)

Turn the ignition switch to "ON" position.

(c)

Clear DTC code.

(d)

Start and run the engine at idle speed to warm up the engine
for at least 5 min.

(e)

Road test the vehicle for at least 10 min.

(f)

Read control system DTC code.

Verify that the system has no DTC code output.

No

Intermittent Fault. Refer to

2.12.7.3

 

Intermittent Fault Check

Yes

Step 8

Diagnostic completed.

2.12.7.47 DTC P0646 P0647

1. DTC Descriptor:

DTC

P0646

Air-Conditioning Clutch Relay Circuit Short To Low Voltage or Open

DTC

P0647

Air-Conditioning Clutch Relay Circuit Short To High Voltage

Engine

Control System JL4G15-D

2-763

Air-Conditioning compressor working voltage is provide by main relay which is controlled by ECM. ECM controls Air-Conditioning
compressor relay internal ground through ECM harness connector EO35 terminal No.51 of, relay pull-in. ECM has a drive circuit
which controls relay coil ground, and drive circuit is equipped with a feedback circuit to ECM. By monitoring the feedback voltage,
ECM determines whether the control circuit is open, short to ground or short to power supply.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection Strategy

Conditions For Setting The DTC

(Control Strategy)

Fault Locations

P0646

Hardware Circuit Checks

When air-conditioning is not working,
with air-conditioning relay control
circuit open or short to ground, the
DTC code will be set.

1. Air-Conditioning Relay

2. ECM

3. Air-Conditioning Relay Circuit

P0647

Hardware Circuit Checks

When air-conditioning is not working,
with air-conditioning relay control
circuit open or short to ground, the
DTC code will be set.

1. Air-Conditioning Relay

2. ECM

3. Air-Conditioning Relay Circuit

3. Schematic:

Refer to 

8.2.6.2

 

Air-conditioning System Circuit Schematic

.

4. Diagnostic Steps:

Refer to 

8.2.7.6

 

Air-conditioning Clutch Inoperative

.

2.12.7.48 DTC P0650

1. DTC Descriptor:

DTC

P0650

Fault Indicator (MIL) Malfunction

CAN network is used in vehicles. Fault lamps are controlled via the instrument panel circuit. When ECM DTC code is set to light
fault lamps, ECM sends a "Light the fault lamp" signal through the CAN network the instrument panel. The instrument panel internal
circuit light the fault lamp indicating engine fault after receiving the instruction from ECM.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection Strategy

Conditions For Setting The DTC

(Control Strategy)

Fault Locations

P0650

Hardware Circuit Checks

Fault indicator output state and ECM
expected status does not match.

1. Instrument Cluster

2. CAN-Bus

Diagnostic Steps:

Step 1

Check other fault lights working.

(a)

Turn the ignition switch to "ON" position.

Other fault lights normal?

Yes

Go to step 3

2-764

Control System JL4G15-D

Engine

No

Step 2

Repair instrument cluster circuit.

Instrument Repair
(a)

Repair instrument cluster power supply circuit. Refer to

11.7.6.7

 

DTC U129C U129D

.

(b)

Repair instrument cluster ground circuit. Refer to

11.7.6.7

 

DTC U129C U129D

.

Is fault resolved?

Yes

System normal.

No

Step 3

Check instrument DTC.

(a)

Connect scan tool.

(b)

Turn the ignition switch to "ON" position.

(c)

Scan instrument DTC.

Is there DTC code?

Yes

Go to step 5

No

Step 4

Test fault indicator.

(a)

Connect scan tool.

(b)

Turn the ignition switch to "ON" position.

(c)

Choose scan tool "Function Test" menu and then "Fault Light
Test".

Is fault indicator lit?

Yes

Go to step 6

No

Step 5

Replace instrument cluster.

(a)

Turn off the ignition switch and remove the ignition key.

(b)

Disconnect the battery negative cable.

(c)

Replace instrument cluster. Refer to 

11.7.7.1

 

Instrument

Cluster Replacement

.

Is fault solved?

Yes

System normal.

No

Step 6

Check instrumentation and ECM network communication.

(a)

Repair instrumentation and ECM network communication
malfunction. Refer to 

11.17.7.4

 

CAN Bus Integrity

Diagnosis

.

Engine

Control System JL4G15-D

2-765

Is fault solved?

Yes

System normal

No

Step 7

Repair ECM power supply circuits.

(a)

Repair ECM power supply circuit. Refer to 

2.12.7.43

 

DTC

P0562 P0563

.

Is fault solved?

Yes

System normal.

No

Step 8

Replace ECM.

(a)

Connect scan tool.

(b)

Turn the ignition switch to "ON" position.

(c)

Scan ECM DTC codes, repair ECM Repair the faulty part. if
necessary, replace ECM. Refer to 

2.2.8.8

 

Engine Control

Module Replacement

.

(d)

Carry out crankshaft self learn after ECM replacement. Refer
to 

2.12.7.11

 

Crankshaft Position Sensor (CKP) Learn

.

(e)

Clear malfunction code.

Next

Step 9

System normal.

2.12.7.49 DTC P0685

1. DTC Descriptor:

DTC

P0685

Main Relay Malfunction

Main relay is used to provide power to fuel injectors and oxygen sensors and other components. Battery provides power to main
relay terminal No.2. ECM controls main relay ground through ECM harness connector EO35 terminal No.62. ECM has a detection
circuit. By monitoring the feedback voltage, ECM determines whether the control circuit is open, short to ground or short to power
supply.

2. Conditions For Setting DTC and The Fault Location:

DTC Code

DTC Detection Strategy

Conditions For Setting The DTC

(Control Strategy)

Fault Locations

P0685

Main Relay Malfunction

The main relay circuit control state
does not match ECM expected
status.

1. Main Relay Circuit

2. Main Relay

3. ECM

2-766

Control System JL4G15-D

Engine