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| - | How to test your 1978-1982 factory Datsun "matchbox" distributor, from the Nissan factory service manual. | + | How to test your 1978-1982 factory Datsun "matchbox" distributor, from the Nissan factory service manual. Matchbox is a nickname for the "IC ignition unit". |
| For [[B310 Electronic Distributor Swap]] | For [[B310 Electronic Distributor Swap]] | ||
| <br>http://datsun1200.com/modules/myalbum/photos/thumbs/1885.jpg] | <br>http://datsun1200.com/modules/myalbum/photos/thumbs/1885.jpg] | ||
| - | = Manual Testing = | + | = General Instructions = |
| - | A volt-ohn-milliammeter (VOM) may be used to diagnose transistor ignition malfunctions. | + | A volt-ohm-milliammeter (VOM) may be used to diagnose transistor ignition malfunctions. |
| Use this scale: | Use this scale: | ||
| Line 18: | Line 18: | ||
| - | == Power Circuit == | + | == Step 5 Power Supply Circuit == |
| - | === Not Running == | + | |
| # IGN key ON, engine not running | # IGN key ON, engine not running | ||
| # connect Voltmeter (20V scale) between distributor case and the "B" connection (stem of T) | # connect Voltmeter (20V scale) between distributor case and the "B" connection (stem of T) | ||
| Line 25: | Line 24: | ||
| Results: | Results: | ||
| * below 11.5 volts. Problem. Check fuse and wiring | * below 11.5 volts. Problem. Check fuse and wiring | ||
| - | * 11.5 - 12.5 volts. This test OK. Complete other tests | + | * 11.5 - 12.5 volts. This test OK. Proceed to Test 6 |
| - | === Cranking == | + | = Step 6 Power Supply (Cranking) = |
| # Pull coil wire from cap and ground it | # Pull coil wire from cap and ground it | ||
| - | # connect Voltmeter (20V scale) between distributor case and the "B" connection (stem of T) | + | # Set Voltmeter to 20V DC scale |
| - | # Crank engine (key at START) | + | # connect Voltmeter between distributor case and the "B" connection (stem of T) |
| + | # Crank engine (key at START) and observe voltage | ||
| Results: | Results: | ||
| * Voltage more than 1V below Battery cranking voltage (or below 8.6V). Check ignition switch, fuse and wiring | * Voltage more than 1V below Battery cranking voltage (or below 8.6V). Check ignition switch, fuse and wiring | ||
| - | * Voltage close to battery cranking voltage (no more than 1V less) AND better than 8.6V. This test is OK. Complete other tests. | + | * Voltage close to battery cranking voltage (no more than 1V lower) AND better than 8.6V. This test is OK. Proceed to Test 7 |
| - | = 7 Ignition Primary Circuit = | + | = Step 7 Ignition Primary Circuit = |
| # IGN key ON, engine not running | # IGN key ON, engine not running | ||
| # connect Voltmeter (20V scale) between distributor case and the "C" connection (head of T) | # connect Voltmeter (20V scale) between distributor case and the "C" connection (head of T) | ||
| Line 44: | Line 44: | ||
| * 11.5 - 12.5 volts. This test OK. Proceed with Test 9 | * 11.5 - 12.5 volts. This test OK. Proceed with Test 9 | ||
| - | = 8 Coil Primary Circuit = | + | |
| + | = Step 8 Coil Primary Circuit = | ||
| # Key OFF | # Key OFF | ||
| # coil wire removed from coil | # coil wire removed from coil | ||
| # | # | ||
| + | |||
| + | |||
| + | |||
| + | = Step 10 Pick-up Coil Resistance = | ||
| + | Check the pickup resistance: | ||
| + | # Key OFF | ||
| + | # ohmmeter between the two wires on the matchbox (red & green wires -- NOT the T-connector). | ||
| + | # set VOM to 1000 ohm scale | ||
| + | |||
| + | Results: | ||
| + | * It should be about 400 ohms. Proceed to Test 11 | ||
| + | * If "substantially" lower or higher than 400 ohms, the pickup is either bad or a wire is pinched or shorted. | ||
| + | |||
| + | |||
| + | = Step 11 Pick-up Coil Output = | ||
| + | Output while cranking. Use ANALOG voltemeter. | ||
| + | |||
| + | # Engine at or above normal operating temperature (HOT) if possible | ||
| + | # VOM at 5V AC or 10V AC scale | ||
| + | # Connect Voltmeter to body of distributor (ground) and internal wire closest to the T-connector | ||
| + | # Remove coil wire from cap and ground it | ||
| + | # Observe analog Voltmeter while cranking engine | ||
| + | |||
| + | Results: | ||
| + | * Needle wavers. OK. But if "no Spark" condition still exists, replace IC ignition unit | ||
| + | * Needle steady. Problem. | ||
| + | *# Check physical condition of pick-up coil and reluctor | ||
| + | *#: http://datsun1200.com/modules/myalbum/photos/thumbs/14075.jpg | ||
| + | *#: Reluctor (4-tooth rotating part). Stator (4-teeth ring) | ||
| + | *# Check wiring and connections between coil and IC ignition unit (the matchbox) | ||
Revision as of 06:59, 18 May 2009
How to test your 1978-1982 factory Datsun "matchbox" distributor, from the Nissan factory service manual. Matchbox is a nickname for the "IC ignition unit".
For B310 Electronic Distributor Swap
]
Contents |
General Instructions
A volt-ohm-milliammeter (VOM) may be used to diagnose transistor ignition malfunctions.
Use this scale:
DC: 20V
Ohms: 1000
AC: 10V
Ohms: 50,000
If possible test with components at operating temperature -- this will help find intermittent problems that only occur when the parts are HOT.
It is not necessary to disconnect the harness connectors when performing the following tests.
Step 5 Power Supply Circuit
- IGN key ON, engine not running
- connect Voltmeter (20V scale) between distributor case and the "B" connection (stem of T)
Results:
- below 11.5 volts. Problem. Check fuse and wiring
- 11.5 - 12.5 volts. This test OK. Proceed to Test 6
Step 6 Power Supply (Cranking)
- Pull coil wire from cap and ground it
- Set Voltmeter to 20V DC scale
- connect Voltmeter between distributor case and the "B" connection (stem of T)
- Crank engine (key at START) and observe voltage
Results:
- Voltage more than 1V below Battery cranking voltage (or below 8.6V). Check ignition switch, fuse and wiring
- Voltage close to battery cranking voltage (no more than 1V lower) AND better than 8.6V. This test is OK. Proceed to Test 7
Step 7 Ignition Primary Circuit
- IGN key ON, engine not running
- connect Voltmeter (20V scale) between distributor case and the "C" connection (head of T)
Results:
- below 11.5 volts. Problem. Proceed with Test 8
- 11.5 - 12.5 volts. This test OK. Proceed with Test 9
Step 8 Coil Primary Circuit
- Key OFF
- coil wire removed from coil
Step 10 Pick-up Coil Resistance
Check the pickup resistance:
- Key OFF
- ohmmeter between the two wires on the matchbox (red & green wires -- NOT the T-connector).
- set VOM to 1000 ohm scale
Results:
- It should be about 400 ohms. Proceed to Test 11
- If "substantially" lower or higher than 400 ohms, the pickup is either bad or a wire is pinched or shorted.
Step 11 Pick-up Coil Output
Output while cranking. Use ANALOG voltemeter.
- Engine at or above normal operating temperature (HOT) if possible
- VOM at 5V AC or 10V AC scale
- Connect Voltmeter to body of distributor (ground) and internal wire closest to the T-connector
- Remove coil wire from cap and ground it
- Observe analog Voltmeter while cranking engine
Results:
- Needle wavers. OK. But if "no Spark" condition still exists, replace IC ignition unit
- Needle steady. Problem.
- Check physical condition of pick-up coil and reluctor
-
- Reluctor (4-tooth rotating part). Stator (4-teeth ring)
-
- Check wiring and connections between coil and IC ignition unit (the matchbox)
- Check physical condition of pick-up coil and reluctor