Checking High Tension Voltage
Checking high tension voltage
Checking ignition spark
- Ignition off.
- Disconnect one spark plug cap.
- Put a new spark plug into the cap.
- Place the spark plug against the engine.
- Operate the starter motor and check for a spark at the plug.
Is there a spark?
Yes - Checking spark plugs
No - Checking engine speed (RPM) sensor signal
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Checking ignition discharge module (IDM) power cable
- Ignition off.
- Disconnect the ignition discharge module (IDM).
- Ignition on.
- Connect a voltmeter between ignition discharge module (IDM) connector terminal 3 and ground.
The voltmeter should read battery voltage.
OK - Checking the ignition discharge module (IDM) ground lead
Not OK - Checking component
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Checking component
- Check fuse 4. Replace fuse if necessary.
Was the fuse intact?
Yes - Verification
No - Checking for an open-circuit
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Checking for an open-circuit
- Check cable between ignition discharge module (IDM) terminal 3 and fuse 4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking the ignition discharge module (IDM) ground lead
- Ignition off.
- Wait approximately 150 seconds.
- Ignition discharge module (IDM) disconnected.
- Connect an ohmmeter between ignition discharge module (IDM) connector terminal 1 and ground.
The ohmmeter should read approximately 0 ohms.
OK - Checking the ignition discharge module (IDM) control signal
Not OK - Checking ignition discharge module (IDM) ground terminal
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Checking ignition discharge module (IDM) ground terminal
- Ignition off.
- Ignition discharge module (IDM) disconnected.
- Check ignition discharge module (IDM) ground terminal (31/52) for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Connect an ohmmeter between ignition discharge module (IDM) connector terminal 1 and ground.
The ohmmeter should read approximately 0 ohms.
OK - The cause of the fault has been poor contact in the ignition discharge module (IDM) ground terminal.
Fault-tracing information
Not OK - Check cable between ignition discharge module (IDM) terminal 1 and ground terminal (31/52) for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Checking for an open-circuit
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Fault-tracing information
- The cause of the fault has been loose connections in the ignition discharge module (IDM) ground terminal.
Continue - FAULT FOUND
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Checking for an open-circuit
- Check cable between ignition discharge module (IDM) terminal 1 and ground terminal (31/52) for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking ignition discharge module (IDM) control signal
- Ignition on.
- Ignition discharge module (IDM) disconnected.
- Connect a multimeter between ignition discharge module (IDM) connector terminal 4 and ground.
- Operate starter motor.
Frequency should be 8 - 10 Hz when the engine is turned over by the starter motor.
OK - Checking ignition spark from the ignition coil
Not OK - Checking signal cable voltage
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Checking signal cable voltage
- Ignition on.
- Ignition discharge module (IDM) disconnected.
- Connect a voltmeter between ignition discharge module (IDM) connector terminal 4 and ground.
The voltmeter should read 0 - 1 V.
OK - Checking signal cable resistance to ground
Not OK - Check cable between ignition discharge module (IDM) terminal 4 and engine control module (ECM) #B11 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Checking for a short-circuit
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Checking for a short-circuit
- Check cable between ignition discharge module (IDM) terminal 4 and engine control module (ECM) #B11 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking signal cable resistance to ground
- Ignition off.
- Wait approximately 150 seconds.
- Ignition discharge module (IDM) disconnected.
- Disconnect control module.
- Connect an ohmmeter between ignition discharge module (IDM) connector terminal 4 and ground.
The ohmmeter should read infinite resistance.
OK - Check cable between ignition discharge module (IDM) terminal 4 and engine control module (ECM) #B11 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Checking for an open-circuit
Not OK - Check cable between ignition discharge module (IDM) terminal 4 and engine control module (ECM) #B11 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Checking for a short-circuit
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Checking for an open-circuit
- Check cable between ignition discharge module (IDM) terminal 4 and engine control module (ECM) #B11 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking for a short-circuit
- Check cable between ignition discharge module (IDM) terminal 4 and engine control module (ECM) #B11 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking ignition spark from the ignition coil
- Ignition off.
- Connect the ignition discharge module (IDM).
- Ignition on.
- Disconnect ignition coil ignition cable from the distributor cap.
- Hold the end of the cable 3-5 mm from ground.
- Operate the starter motor and check for a spark.
Is there a spark?
Yes - Checking rotor and distributor cap
No - Try a new ignition coil/ignition discharge module (IDM).
Replacing component
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Replacing component
- Try a new ignition coil/ignition discharge module (IDM).
Continue - Verification
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Checking rotor and distributor cap
- Reinstall the spark plug cap.
- Connect ignition coil ignition cable to distributor cap.
- Try to start the engine.
Does the engine start?
Yes - The cause of the fault has been loose connections in the ignition discharge module (IDM) or engine control module (ECM) connector. Check connectors for contact resistance and oxidation and remedy in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Checking for contact resistance and oxidation
No - Check the distributor cap, rotor and ignition cables for arcing damage, moisture or dirt. Replace if necessary.
Checking for damage
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Checking for contact resistance and oxidation
- The cause of the fault has been loose connections in the ignition discharge module (IDM) or engine control module (ECM) connector. Check connectors for contact resistance and oxidation and remedy in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - FAULT FOUND
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Checking for damage
- Check the distributor cap, rotor and ignition cables for arcing damage, moisture or dirt. Replace if necessary.
Continue - Verification
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Checking spark plugs
- Ignition off.
- Replace all spark plugs.
Note! It is vital that the correct spark plugs are used, see parts catalogue for P/N. Check the spark gap of new plugs before they are fitted. Spark gap should be 0.7 - 0.8 mm.
- Connect ignition cables to spark plugs.
- Try to start the engine.
Does the engine start?
Yes - The cause of the fault has been poor spark plugs.
Fault-tracing information
No - Fault-tracing information
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Fault-tracing information
The cause of the fault has been poor spark plugs.
Continue - FAULT FOUND
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Verification
Verify
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
Carry out the following:
- Ignition off.
- Reconnect connectors, reinstall components.
- Disconnect spark plug cap
- Put a new spark plug into the cap.
- Place the spark plug against the engine.
- Operate the starter motor and check for a spark at the plug.
Is there a spark?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.
Do you want to terminate fault-tracing at this time?
Yes - Exit fault-tracing
No - Attempt New Test
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Information
Fault-tracing information
The previous test indicates that a repair must be made before continuing with fault-tracing. You cannot proceed with the fault-tracing tests at this point.
Continue - No Fault Found
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No Fault Found - No Fault Found
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Checking engine speed (RPM) sensor signal
- Ignition on.
- Operate starter motor.
Read off engine speed (RPM).
Engine speed (RPM) should be 100-300 rpm when the engine is being turned by the starter motor.
OK - Checking ignition discharge module (IDM) power cable
Not OK - Information
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