AT 261 – AT 261 – Lab 12-13c - Ignition System Diagnosis and service
Name: ______
Date: ______
Distributor Inspection and Removal
Tools Needed;
Tool Board
TDC Whistle
1 - Engine Number 1 - Honda
Hand-Crank the engine until it is at TDC for #1 Cylinder.
Remove and inspect the distributor.
Inspect the distributor binding or loose bearings.
Inspect the distributor O-Ring.
Reinstall the distributor and show the instructor that it is still pointed at cylinder number 1.
Is this sensor a Hall Effect, Photo, or Magnetic Pulse type sensor? ______
Based on your findings is this distributor OK? ______
2 - Engine Number 2 - Ford
Hand-Crank the engine until it is at TDC for #1 Cylinder.
Remove and inspect the distributor.
Inspect the distributor binding or loose bearings.
Inspect the distributor O-Ring.
Reinstall the distributor and show the instructor that it is still pointed at cylinder number 1.
Is this sensor a Hall Effect, Photo, or Magnetic Pulse type sensor? ______
Based on your findings is this distributor OK? ______
What was different about this distributor than the Honda/Acura design? ______
Distributor Sensor Testing
Tools Needed;
DVOM
Brass Feeler Gauges.
3 - Coil Number 1 -
Specs - Air Gap - .014" - ______OK / NOT OK
What wire colors are the CYP (Cam Sensor) sensor? ______
CYP (Cam Sensor) Sensor Resistance - 150 - 180 Ohms - ______OK / NOT OK
Set the meter on A/C volts and rotate the rotor CYP (Cam Sensor). Does the meter show a A/C voltage reading that increases in speed as the rotor is turned? ______
Can this distributor indicate TDC? ______
Is this sensor a Hall Effect, Photo, or Magnetic Pulse type sensor? ______
Based on your findings is this distributor OK? ______
4 - Coil Number 2 -
Specs - Air Gap - .016" - ______OK / NOT OK
What wire colors are the TDC sensor? ______
What wire colors are the CYP (Cam Sensor) sensor? ______
TDC Sensor Resistance - 200 - 240 Ohms - ______OK / NOT OK
CYP (Cam Sensor) Sensor Resistance - .400K - .500 Ohms - ______OK / NOT OK
Set the meter on A/C volts and rotate the rotor CYP (Cam Sensor). Does the meter show a A/C voltage reading that increases in speed as the rotor is turned? ______
Set the meter on A/C volts and rotate the rotor (TDC SENSOR). Does the meter show a A/C voltage reading that increases in speed as the rotor is turned? ______
Is this sensor a Hall Effect, Photo, or Magnetic Pulse type sensor? ______
Based on your findings is this distributor OK? ______
No Start Diagnosis
Tools needed;
DVOM
Factory Shop Manual
2002 Honda Accord
Customer States - No Start.
Verify if there is a no-spark condition present.
Inspect and check your ignition coil - Ensure the vehicle is off, and the distributor is not electrically connected.
Primary Windings ______ohms
Secondary Windings ______ohms
Follow the procedures on page 4-22 for diagnosis. Also use the schematic on page 4-18.
What are the wire color(s) and for the ICM
______
______
______
______
What is the wire color(s) that power the coil ______
Should there be power at the coil when the key is on? ______
What three fuses can cause a no-start condition? ______
What are the wire color(s) that ground the coil ______
What are the wire color(s) for the CYP (Cam Sensor) ______
Where do they go? ______
If at Step 4, and there is no battery voltage, what other components could be at fault? ______
What did you find was the problem at Step 5 ______
Hint the ECM is located under the radio, the connectors can be accessed from the passenger side floor.
Conclusions ______
NATEF TASKS - VIII. ENGINE PERFORMANCE
C. Ignition System Diagnosis and Repair
1. Diagnose ignition system related problems such as no-starting, hard starting, engine misfire, poor driveability, spark knock, power loss, poor mileage, and emissions concerns on vehicles with electronic ignition (distributorless) systems; determine necessary action. P-1
2. Diagnose ignition system related problems such as no-starting, hard starting, engine misfire, poor driveability, spark knock, power loss, poor mileage, and emissions concerns on vehicles with distributor ignition (DI) systems; determine necessary action. P-1
3. Inspect and test ignition primary circuit wiring and solid state components; perform necessary action. P-2
4. Inspect, test and service distributor. P-3
5. Inspect and test ignition system secondary circuit wiring and components; perform necessary action. P-2
6. Inspect and test ignition coil(s); perform necessary action. P-1
7. Check and adjust ignition system timing and timing advance/retard (where applicable). P-3
8. Inspect and test ignition system pick-up sensor or triggering devices; perform necessary action. P-1
2