IGNITION COIL CHECK
Check by the following procedure, and replace the coil if there is a malfunction.
SECONDARY COIL RESISTANCE CHECK
Measure the resistance between the high-voltage terminals of the ignition coil.
- Standard value: 8.5 - 11.5 kohms
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Note. An analog-type ohmmeter should be used.
Note. Connect the negative probe of the ohmmeter to terminal No. 1.
| CAUTION | This test must be performed quickly (in less than 10 seconds) to prevent coil from burning and ignition power transistor from breaking. |
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- Connect and disconnect 1.5 V battery between terminals No. 2 and No. 3, and observe the ohmmeter whether there is continuity or not.
- If results do not agree with the table below, replace the primary coil and ignition power transistor assembly.
SPARK PLUG CABLE RESISTANCE CHECK
Measure the resistance of the all spark plug leads.
- Check the cap and coating for cracks.
- Measure the resistance. Limit: 19 kohms
- If resistance is greater than 19 kohms, replace the cable.
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SPARK PLUG CHECK AND CLEANING
| CAUTION | Do not attempt to adjust the gap of the iridium plug. Cleaning of the iridium plug may result in damage to the iridium and platinum tips. Therefore, if carbon deposits must be removed, use a plug cleaner and complete cleaning within 20 seconds to protect the electrode. Do not use a wire brush. |
Check the plug gap and replace if the limit is exceeded.
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- Standard value: 0.7 - 0.8 mm (0.028 - 0.031 inch)
- Limit: 1.0 mm (0.039 inch)
CAMSHAFT POSITION SENSOR CHECK
Refer to DTC P0340: CAMSHAFT POSITION SENSOR CIRCUIT .
CRANK ANGLE SENSOR CHECK
Refer to DTC P0335: CRANKSHAFT POSITION SENSOR CIRCUIT .
MEASUREMENT METHOD
- Clamp the spark plug cable (Number 1 or 3) with the secondary pickup. NOTE: Because of the two-cylinder simultaneous ignition system, the waves for two cylinders in each group appear during wave observation. However, wave observation is carried out for the cylinder (Number 1 or 3) with the spark plug cable which has been clamped by the secondary pickup. NOTE: Identification of which cylinder wave pattern is displayed can be difficult, but the wave pattern of the cylinder which is clamped by the secondary pickup will be stable, so this can be used as a reference.
- Clamp the spark plug cable (Number 1 or 3) with the trigger pickup. NOTE: Clamp the same spark plug cable as the one which has been clamped by the secondary pickup.
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Example 1
- Wave characteristics Spark line is high and short.
- Cause of problem Spark plug gap is too large.
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- Wave characteristics Spark line is low and long, and is sloping. Also, the second half of the spark line is distorted. This could be a result of misfiring.
- Cause of problem Spark plug gap is too small.
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- Wave characteristics Spark line is low and long, and is sloping. However, there is almost no spark line distortion.
- Cause of problem Spark plug gap is fouled.
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- Wave characteristics Spark line is high and short. Difficult to distinguish between this and abnormal wave pattern example 1.
- Cause of problem Spark plug cable is not properly connected. (Causing a dual ignition)
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- Wave characteristics No waves in wave damping section
- Cause of problem Short in ignition coil.
