Honda S2000 2000-2004 AP1: Ignition System

Honda S2000

COMPONENTS

CIRCUIT DIAGRAM

IGNITION TIMING INSPECTION

1. Connect the HDS to the data link connector (DLC), and check for DTC's. If a DTC is present, diagnose and repair the cause before inspecting the ignition timing.
2. Start the engine. Hold the engine at 3,000 rpm with no load (in Neutral) until the radiator fan comes on, then let it idle.
3. Check the idle speed, and adjust it if necessary.
4. Follow the tester's prompts to get the tester in the "SCS" mode (see Tester Operator's Manual)
5. Connect the timing light to the No. 1 ignition coil wire.

Connecting Timing Light To No. 1 Ignition Coil Wire

6. Aim the light toward the pointer. Check the ignition timing under no load conditions: headlights, blower fan, and air conditioner are not operating. If the ignition timing differs from the specification below, replace the Engine Control Module (ECM).

Ignition Timing: 5° +/- 2° BTDC (RED mark) at idle in Neutral

Aiming Light Toward Pointer

7. Turn the ignition switch OFF.
8. Disconnect the HDS and the timing light.

SPARK PLUG INSPECTION

1. Inspect the electrodes and ceramic insulator.

• Burned or worn electrodes may be caused by:
  • Advanced ignition timing
  • Loose spark plug
  • Plug heat range too hot
  • Insufficient cooling

• Fouled plug may be caused by:
  • Retarded ignition timing
  • Oil in combustion chamber
  • Incorrect spark plug gap
  • Plug heat range too cold
  • Excessive idling/low speed running
  • Clogged air cleaner element
  • Deteriorated ignition coils

Inspecting Electrodes and Ceramic Insulator

2. Do not adjust the gap of platinum tip plugs; replace the spark plug if the gap is out of specification.

• Electrode Gap:
  • Standard (New): 1.0-1.1 mm (0.039-0.043 in.)
  • Service Limit: 1.3 mm (0.015 in.)

Do Not Adjust Gap Of Platinum Tip Plugs

3. Replace the plug at the specified interval, or if the center electrode is rounded. Use only the spark plugs listed.

• Spark Plugs:
  • NGK: PFR7G-11S
  • DENSO: PK22PR-L11S

4. Apply a small quantity of anti-seize compound to the plug threads, and screw the plugs into the cylinder head finger-tight. Then torque them to 25 N.m (2.5 kgf.m, 18 Ibf.ft).

IGNITION SWITCH

TESTING PROCEDURES

SRS components are located in this area. Review the SRS component locations, and precautions, and procedures before performing repairs or service.

1. Make sure you have the anti-theft code for the radio, then write down the frequencies for the radio's preset buttons.
2. Disconnect the battery negative cable.
3. Disconnect the 7P connector from the under-dash fuse/relay box.
4. Check for continuity between the terminals in each switch position according to the table.
5. If the continuity checks do not agree with the table, replace the electrical switch.
6. After reconnecting the battery, enter the anti-theft code for the radio, then enter the customer's radio station presets.

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Honda S2000 AP1

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