Chery Tiggo. Manual — part 136
Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
ITEM
CONDITION
DATA (DC VOLTAGE)
3
ECM ground (IGN)
Ignition switch: ON
Approximately 0 V
51
ECM ground (Signal)
Ignition switch: ON
Approximately 0 V
53
ECM ground (Signal)
Ignition switch: ON
Approximately 0 V
61
ECM ground (Power)
Ignition switch: ON
Approximately 0 V
80
ECM ground (Power)
Ignition switch: ON
Approximately 0 V
Confirmation Procedure:
Before performing the following procedure, confirm that battery voltage is more than 12 V.
• Turn ignition switch off.
• Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available.
• Turn ignition switch on.
• Start engine then select view data stream.
• If the data stream is detected, the condition is intermittent (See Diagnosis & Testing Diagnostic Help in Section
03 Electronic Engine Controls).
• If data stream is not detected, go to Diagnostic Procedure - Step 1.
1.
INSPECTION START
• Start engine.
Is engine running?
Yes
>>
Go to step 7.
No
>>
Go to step 2.
2.
CHECK ECM POWER SUPPLY CIRCUIT - (1)
• Turn ignition switch off and then on.
• Check voltage between ECM terminal 13 and
ground.
• Battery voltage should exist.
Is the check result normal?
Yes
>>
Go to step 4.
No
>>
Go to step 3.
DIAGNOSIS & TESTING
LTSMD030061
03
3.
DETECT MALFUNCTIONING PART
• Check the following:
− Harness connectors C-103, E-103, terminal 14
− Front fuse and relay box connector A
− Fuse 17
• Check harness for open or short between ECM and fuse.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace malfunctioning part.
4.
CHECK GROUND CONNECTIONS
• Turn ignition switch off.
• Loosen and retighten one ground screw on the body.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace ground connections.
5.
CHECK ECM GROUND CIRCUIT FOR AN OPEN OR SHORT
• Disconnect ECM harness connector.
• Check harness continuity between ECM terminals 3, 51, 53, 61, 80 and ground.
• Continuity should exist.
• Check harness for short to power.
Is the check result normal?
Yes
>>
Go to step 7.
No
>>
Go to the next step.
6.
DETECT MALFUNCTIONING PART
• Check harness for open or short between ECM terminals 3, 51, 53, 61, 80 and ground.
• Check harness for an open or short to power in harness or connectors.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace the circuit for an open or short to power in harness or connectors.
DIAGNOSIS & TESTING
7.
CHECK ECM POWER SUPPLY CIRCUIT - (2)
• Turn ignition switch on and then off.
• Check voltage between ECM terminals 44, 45, 63
and ground.
• Voltage: Turn the ignition switch on and battery
voltage should exist. Turning the ignition switch
OFF, battery voltage will exist for a few seconds,
then drop to approximately 0 V.
Is the check result normal?
Yes
>>
Check the starting system.
No
>>
Go to the next step.
8.
CHECK THE STARTER RELAY CONTROL CIRCUIT
• Turn ignition switch OFF. Wait for at least 10 sec-
onds.
• Check voltage between ECM terminal 14 and
ground.
• Battery voltage should exist.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Go to step 10.
9.
CHECK ECM POWER SUPPLY CIRCUIT - (3)
• Disconnect ECM harness connector.
• Disconnect front fuse and relay box harness connector F.
• Check harness continuity between ECM terminals 44, 45, 63 and front fuse and relay box terminal F3.
• Continuity should exist.
• Check harness for short to ground and short to power.
Is the check result normal?
Yes
>>
Go to step 12.
No
>>
Repair circuit for an open or short to power or short to ground in harness or connectors.
DIAGNOSIS & TESTING
LTSMD030062
LTSMD030063
03
10.
CHECK STARTER RELAY CONTROL CIRCUIT
• Disconnect ECM harness connector.
• Disconnect front fuse and relay box harness connector A.
• Check harness continuity between ECM terminal 14 and front fuse and relay box terminal A1.
• Check harness continuity between front fuse and relay box terminal G2 and G5.
• Continuity should exist.
• Also check harness for short to ground and short to power.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair circuit for an open or short to ground or short to power in harness or connectors.
11.
CHECK FUSE
• Disconnect fuse 23 (10A), fuse 24 (5A) in front fuse and relay box.
• Check fuses.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Replace fuse 23 or 24.
12.
CHECK FRONT FUSE AND RELAY BOX
• Check the front fuse and relay box for damage.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Replace front fuse and relay box.
13.
REPLACE AND PROGRAM ECM
• Replace the ECM.
NOTE :
The Immobilizer control module must be matched to the new ECM (See ECM Removal & Installation in Section 03
Electronic Engine Controls).
DIAGNOSIS & TESTING
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