Part 2
Check the start system
Other information
- For information about the cable routing, see the relevant Wiring Diagram.
- For further information about the fuses and relays, see the Wiring Diagram.
1 - Check the voltage drop in the starter motor and battery circuit
2 - ???
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Check the voltage drop in the starter motor and battery circuit
- The battery shall be fully charged.
- The vehicle and engine temperatures must be above 20 °C (68 °F).
Warning! If the engine cooling fan is running, wait until it has stopped.
- Ignition off.
- For vehicles with automatic transmission:
The gear selector shall be in position P or N.
- For vehicles with manual transmission:
The gear lever shall be in neutral position.
- Parking brake applied.
- Remove the starter motor relay.
- Expose the battery.
- Connect a voltmeter between the battery positive and negative terminals.
- Temporarily connect two cables to relay base terminal #3(30) and terminal #5(87).
Use two cables with suitable cable terminal when short-circuiting so that the spark does not damage the relay socket.
Check the voltage of the battery when the starter motor is operating. Temporarily short-circuit the cables to each other so that the control solenoid draws power and the starter motor starts.
Make a note of the value!
Note! Do not bridge directly in the relay socket.Contacts may be damaged.
The voltage may deviate slightly depending on the engine's compression stage.
Therefore, an average value shall be taken.
Connect a voltmeter between starter motor voltage supply terminal #6/25:1(#B1) and the engine block.
Check the voltage across the starter motor when it works by temporarily shorting the cables to each other so that the control solenoid is activated and the starter motor starts.
Make a note of the value!
The difference between the voltage of the battery and starter motor must not exceed 1 V.
If the difference is greater this is due to too high frequency in the starter motor supply and ground circuit.
If the value is OK there is no voltage drop in the starter motor or battery circuit.
Option Yes below finishes fault-tracing for the starter motor.
If the value is not OK there is a voltage drop in the starter motor and battery circuit.
Option No below leads to fault-tracing with regard to voltage drop in the starter motor and the battery circuit.
Other information
- For information about the cable routing, see the relevant Wiring Diagram.
- For further information about the fuses and relays, see the Wiring Diagram.
Is the value OK?
Yes - ???
No - Checking the wiring and connections in the positive and negative circuits
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Checking the wiring and connections in the positive and negative circuits
When the voltage drop is too high this means too high resistance in the circuit.
The ground terminals are an important part of the vehicle's electrical system.
All sub-system voltage levels refer to the vehicle's ground terminals (as 0 V).
The three figures show grounding point bolted joint for engine block (the left figure) and body (the right figure),as well as the current's path in the joints.
If there is inadequate ground connection contact, this will have a negative impact on the electrical system.
It is very important that the ground connection is correct, that is, that frame screws are adequately tightened and that the cable terminals at the connections are correctly contact-pressed.
Grounding point where several cables are interconnected is of special importance.
Note! There must not be any corrosion between the cable terminals and screw heads.
Check the starter motor connection for voltage supply and connection to the engine block. Check for contact resistance and oxidation.
Check the connections of the terminals to the cables.
Check the engine's ground connection for contact resistance and oxidation.
Check the connections of the terminals to the cables.
Check the positive and negative terminals of the battery. Check for contact resistance and oxidation.
Check the connections of the terminals to the cables.
Check the connection for the battery negative lead to the body.
Remedy as necessary.
Other information
- For information about the cable routing, see the relevant Wiring Diagram.
- For further information about the fuses and relays, see the Wiring Diagram.
- Checking wiring and terminals Checking Wiring and Terminals
Continue - Verification
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Checking the starter motor
Check the voltage feed cable between the battery and starter motor #6/25:1(#B1) for short-circuit to ground and open circuit.
Check fuses.
If the starter motor does not work when bridging between terminal #6/25:1(#B1) and terminal #6/25:2(#A1), despite being supplied with voltage from the battery, there is an internal fault.
Replace starter motor.
Remedy as necessary.
Other information
- For information about the cable routing, see the relevant Wiring Diagram.
- For further information about the fuses and relays, see the Wiring Diagram.
- Checking wiring and terminals Checking Wiring and Terminals
Continue - Verification
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Verification
Verification
VERIFIED - VERIFIED
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Checking the park / neutral position (PNP) function in the gear position sensor (only vehicles with automatic transmission)
Checking the park / neutral position (PNP) function in the gear position sensor (only vehicles with automatic transmission)
Checking the park / neutral position (PNP) function in the gear position sensor (only vehicles with automatic transmission)
Note! For the test to be carried out the battery must be fault free and the starter motor relay and starter motor and corresponding wiring must be checked.
Caution! Avoid touching the pins in the control module and the corresponding connector on the cable harness.There is a risk of static discharge which could damage the control module.Discharge yourself and tools to be used by holding the tool's metal part and touching a body part on the car just before starting to work.
- Ignition on.
- When the gear position sensor is in position P or N the Engine Control Module (ECM) receives signals from the Transmission Control Module (TCM) that start is permitted.
- The gear selector shall be in position P or N.
- Parking brake applied.
Check the voltage between the Engine Control Module (ECM) terminals #B15 and #B1.
The voltage must be 0 V.
Other information
- See Connecting breakout box for Engine Control Module (ECM).
- See Signal specification for Engine Control Module (ECM).
- For information about the cable routing, see the relevant Wiring Diagram.
Is the voltage OK?
Yes - Replacing a component
No - Checking the wiring and terminals
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Replacing a component
Caution! Avoid touching the pins in the control module and the corresponding connector on the cable harness.There is a risk of static discharge which could damage the control module.Discharge yourself and tools to be used by holding the tool's metal part and touching a body part on the car just before starting to work.
If voltage is approximately 0 V on terminal #B15 on the Engine Control Module (ECM), when the gear-shift position sensor is in position P or N, the circuit for the gear-shift position sensor is working.
The fault may be in the Engine Control Module (ECM).
Try replacing Engine Control Module (ECM).
Note! Before replacing the control module, ensure that all other relevant symptom tests have been carried out.
Other information
- See replacing the Engine Control Module (ECM).
Continue - Verification
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Checking the wiring and terminals
Caution! Avoid touching the pins in the control module and the corresponding connector on the cable harness.There is a risk of static discharge which could damage the control module.Discharge yourself and tools to be used by holding the tool's metal part and touching a body part on the car just before starting to work.
Check the cable between the Engine Control Module (ECM) terminal #B15 and Transmission Control Module (TCM) terminal #A5. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Remedy as necessary.
Other information
- See Connecting breakout box for Engine Control Module (ECM).
- See Connecting breakout box for Transmission Control Module (TCM).
- See Signal specification for Engine Control Module (ECM).
- See Signal specification for Transmission Control Module (TCM).
- For information about the cable routing, see the relevant Wiring Diagram.
Was a fault detected?
Yes - Verification
No - DONE
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall the connectors, components etc.
- Parking brake applied.
- The battery shall be fully charged.
- The gear selector shall be in position D.
- Turn the ignition key to start position (key position III).
The engine should not be able to be started.
- The gear selector shall be in position P or N.
- Turn the ignition key to start position (key position III).
It should now be possible to start the engine.
Is the function OK?
Yes - VERIFIED
No - FAULT FOUND
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FAULT FOUND - Checking the diagnostic trouble codes (DTCs)
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Exit fault-tracing
Exit fault-tracing
The information below is conditional on no relevant diagnostic trouble codes being stored for the symptom and that all diagnostic tests for the symptom have been performed.
The fault must be diagnosed and remedied.
If no malfunction has been found in any of the diagnostic tests, report the result of the troubleshooting to the sales company/importer according to normal report procedure.
Continue - VERIFIED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Checking the diagnostic trouble codes (DTCs)
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Checking the diagnostic trouble codes (DTCs)
- Turn the ignition key to position II.
Click on the VCT2000 symbol.
Check if any of the following diagnostic trouble codes have been generated in the vehicle.
Remedy as necessary.
- CEM-DE11.
- CEM-E000.
- CEM-E001.
- CEM-6C54.
- ECM, Communication with Central Electronic Module (CEM).
- ECM, Communication with Brake Control Module (BCM).
Other diagnostic trouble codes (DTCs) that may be stored in the control modules in the vehicle are not relevant for the symptom.
If none of the above diagnostic trouble codes are detected, proceed with general troubleshooting of the CAN-net according to instructions under TROUBLESHOOTING/GENERAL DIAGNOSTICS AND TESTS.
Continue - DONE
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Replacing the Steering Wheel Module (SWM)
If no fault is found on the cables or connections this means that the Steering Wheel Module (SWM) is defective and must be replaced.
Other information
- Steering wheel control module Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Continue - Verification
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Verification
Note! After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall the connectors, components etc.
Check the operation of the steering column lock. Insert the ignition key in the ignition switch.
The steering column lock must be unlocked. It must be possible to turn the steering wheel.
Then check that the car can be started.
Can the vehicle be started?
Yes - VERIFIED
No - Fault-tracing information
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Fault-tracing information
The fault must be diagnosed and remedied.
If no malfunction has been found in any of the diagnostic tests, report the result of the troubleshooting to the sales company/importer according to normal report procedure.
Continue - FAULT-TRACING FAILED
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Checking the diagnostic trouble codes (DTCs)
Before performing check of the starting system: Ensure that there are no DTCs in the Central electronic module (CEM), Transmission control module (TCM), Engine control module (ECM) or Brake control module (BCM) that could cause these symptoms. DTCs that affect LIN communication must be fault-traced before this check is continued.
Remedy these diagnostic trouble codes (DTCs) first.
Continue - Checking the Steering Column Lock Module (SCL)
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Checking the diagnostic trouble codes (DTCs)
- Ignition switch position II.
Click the VCT2000 symbol to read diagnostic trouble codes (DTCs).
Check if diagnostic trouble code CEM-1A41 is detected.
Note! DTC CEM-1A41 may be set if the driver holds the key position between position II and III for longer than 0.5 second.
Are there relevant diagnostic trouble codes (DTCs)?
Yes - Replacing the Start Control Unit (SCU)
No - Checking the starter motor circuit
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Checking the starter motor circuit
Note! The conditions for this test are that:
- The battery shall be fully charged.
- The car and engine temperatures exceed 20 °C (68 °F).
Warning! If the engine cooling fan is running, wait until it has stopped.
- Ignition off.
- Place the gear selector in neutral (automatic transmission: parking position "P").
- Expose the starter motor relay in the relay/fuse box in the engine compartment. For position of relay, see wiring diagram.
- Short-circuit the cables to the relay socket #3(30) and #5(87) to each other so that the control solenoid pulls.
Hint: A starter motor relay without protective cover can be used for short-circuiting. Close the connectors manually.
Does the starter motor run when the relay is short-circuited?
Yes - Fault-tracing information
No - Checking the starter motor
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Downloading new software
- Download new software in Steering column lock module (SCL).
Continue - Verification
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Fault-tracing information
- Troubleshoot diagnostic trouble code CEM-DD10.
Continue - DONE
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Fault-tracing information
- Troubleshoot diagnostic trouble code CEM-6C41 according to DIAGNOSTICS/DIAGNOSTIC TROUBLE CODE.
Continue - DONE
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Downloading new software
- Download new software in Central electronic module (CEM).
Continue - Checking the ignition switch
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Checking the ignition switch
- Click on the VCT2000 symbol.
- Check that the status of the ignition switch corresponds to all key positions.
Compare with table in link below.
Other information
- For table,
Description of switch for start control unit (SCU) Description of Switch For Start Control Unit (SCU)
Are all key positions OK?
Yes - Verification
No - Checking the ignition switch
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Checking the ignition switch
- Change to another key belonging to the vehicle.
- Click on the VCT2000 symbol.
- Check that the status of the ignition switch corresponds to all key positions.
Compare with table in link below.
If key positions' status cannot be read out, or if the shown key position is invalid, the Start Control Unit (SCU) is probably defective.
Other information
- For table,
Description of switch for start control unit (SCU) Description of Switch For Start Control Unit (SCU)
Are all key positions OK?
Yes - Programming new keys
No - Replacing the Start Control Unit (SCU)
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Programming new keys
- Replace the defective key and program a new key for the vehicle according to VIDA/SOFTWARE.
Continue - Verification
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Checking the connector
- Check that the 3-pin LIN-connector is assembled correctly.
Continue - Checking the diagnostic trouble codes (DTCs)
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Checking the diagnostic trouble codes (DTCs)
- Ignition switch position II.
- Click the VCT2000 symbol to read diagnostic trouble codes (DTCs).
Check if diagnostic trouble code CEM-1A41 is detected.
Are there relevant diagnostic trouble codes (DTCs)?
Yes - Replacing the Start Control Unit (SCU)
No - Fault-tracing information
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Fault-tracing information
- Ignition off.
- Check relevant fuses for Central electronic module (CEM) and Start control module (SCU).
- Check cables and connections to Central electronic module (CEM).
- Check cables and connections to Start control module (SCU).
Other information
- Checking wiring and terminals Checking Wiring and Terminals
Continue - Checking the ignition switch
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Replacing the Start Control Unit (SCU)
Check the cables and connections between the Start Control Unit (SCU) and the Central electronic module (CEM).
Check the fuse for the Start Control Unit (SCU).
If no fault is found on the cables or connections this means that the Start Control Unit (SCU) is defective and must be replaced.
Other information
- Ignition lock Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
- For further information about the fuses and relays, see the Wiring Diagram.
Continue - Checking the ignition switch
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Checking the ignition switch
- Click on the VCT2000 symbol.
- Check that the status of the ignition switch corresponds to all key positions.
Compare with table in link below.
Other information
- For table,
Description of switch for start control unit (SCU) Description of Switch For Start Control Unit (SCU)
Are all key positions OK?
Yes - Verification
No - Fault-tracing information
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Replacing the Start Control Unit (SCU)
Check cables and connections to Start control module (SCU).
Check the fuse for the Start Control Unit (SCU).
If no fault is found on the cables or connections this means that the Start Control Unit (SCU) is defective and must be replaced.
Other information
- Ignition lock Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
- For further information about the fuses and relays, see the Wiring Diagram.
Continue - Checking the ignition switch
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Fault-tracing information
Is the vehicle equipped with a Gas discharge lamp module (GDL)?
See DIAGNOSTICS/NETWORK.
Select an alternative.
Yes - Check LIN diagnostic trouble codes (DTCs)
No - Replacing the central electronic module (CEM)
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Check LIN diagnostic trouble codes (DTCs)
- Disconnect the Gas Discharge Lamp Module (GDL).
The control modules are located by each light. Disconnect the one located on the driver's side.
- Click the VCT2000 symbol to read diagnostic trouble codes (DTCs).
Establish whether relevant LIN diagnostic trouble codes (DTCs) are stored in the control module.
Are there relevant LIN diagnostic trouble codes (DTCs)?
Yes - Fault-tracing information
No - Replacing the central electronic module (CEM)
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Fault-tracing information
- Troubleshoot current LIN diagnostic trouble codes according to DIAGNOSTICS/DIAGNOSTIC TROUBLE CODE.
See wiring diagram as well.
Continue - DONE
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Replacing the central electronic module (CEM)
- Replace Central electronic module (CEM) according to the link below.
Other information
- Control module relay box passenger compartment Service and Repair
Continue - DONE
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Checking the Steering Column Lock Module (SCL)
Different troubleshooting is available for vehicles with and without steering column lock (SCL). Examine whether the vehicle is equipped with the steering column lock module (SCL) by clicking on the VCT2000 symbol.
Is the vehicle equipped with a steering column lock module (SCL)?
Yes - Checking locked steering wheel lock
No - Checking text message in Driver Information Module (DIM)
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Fault-tracing information
If the starter motor runs, the problem is one of the following:
- Damaged starter motor relay.
- Voltage feed from the ignition to the starter motor relay when cranking. (For certain engine versions via Engine control module (ECM).)
- Engine control module (ECM) does not ground the starter motor relay.
Start troubleshooting by replacing starter motor relay.
Check cable and voltage feed between ignition and starter motor relay.
The reason for the Engine control module (ECM) not being able to activate (grounding) the starter motor relay may be:
- The signal from the clutch pedal sensor via CAN indicates that the clutch pedal is not pressed down enough.
- The signal from the brake pedal position sensor indicates that the brake pedal is not pressed down enough (only applies to the starting conditions that require brake pedal to be pressed down).
- The gear selector's signal (automatic transmissions) for P and N is incorrect.
Continue - Verification
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Checking the starter motor
Troubleshoot according to the checks for starter motor under:
INFORMATION/TROUBLESHOOTING/symptom-related tests/3 Electrical system/30 General/300 General
Continue - Verification
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