Igniter Unit Test ACCORD AND PRELUDE WITH HITACHI DISTRIBUTOR. See Figure 2

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Preston Matthews
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1 Igniter Unit Test ACCORD AND PRELUDE WITH HITACHI DISTRIBUTOR See Figure 2 This procedure is not applicable to fuel injected Preludes. 1. Remove the distributor cap. 2. Disconnect the lead wires from the igniter unit. 3. Using a voltmeter with the ignition switch ON, check the voltage between the blue wire and body ground, then the black/yellow wire to body ground. There should be battery voltage present. 4. If no voltage is present, check the wiring to the igniter unit. 5. Turn the ignition OFF. Using an ohmmeter, check the continuity of the igniter at the terminals: a. Place the positive probe on the black/yellow wire terminal and negative probe on the blue wire terminal; continuity should be read on ohmmeter. b. Place the positive probe on the blue wire terminal and negative probe on the black/yellow wire terminal; no continuity should be read on the ohmmeter.

2 Fig. 2: Hitachi igniter wiring and terminals 6. If ohmmeter readings are not as specified, replace the igniter unit ACCORD AND PRELUDE WITH TOYO DENSO DISTRIBUTOR See Figure 3 1. Remove the igniter unit. 2. Using a voltmeter with the ignition switch ON, check the voltage between the blue wire and ground, then the black/yellow wire to ground. There should be battery voltage. 3. If no voltage is present, check the wiring to igniter unit. 4. Turn the ignition switch OFF. 5. Connect a jumper wire between the green and blue terminals. Using an ohmmeter, check the continuity of the igniter at the terminals: a. Place the positive probe on the black/yellow wire terminal and negative probe on the blue wire terminal; continuity should be read on ohmmeter.

3 b. Place the positive probe on the blue wire terminal and negative probe on the black/yellow wire terminal; no continuity should be read on the ohmmeter. Fig. 3: Toyo Denso igniter terminals 6. If ohmmeter readings are not as specified, replace igniter unit ACCORD AND PRELUDE WITH TOYO DENSO DISTRIBUTOR See Figures 4 and 5 This procedure is not applicable to fuel injected Preludes. 1. Remove the distributor cap, rotor and shield. Remove the distributor hold-down bolts and remove the distributor for access. Leave the distributor wiring harness connected. 2. Remove the igniter unit from the distributor housing. 3. With the ignition switch ON, use a voltmeter to check for the presence of battery voltage at the black/yellow wire terminal, then at the terminal for the "BLU 1" wire. Battery voltage should be present in both cases. 4. Turn the ignition switch OFF.

4 5. Measure the resistance between the "BLU 2" and the adjacent green wire terminals. It should be approximately 750 ohms. The following steps do not pertain to 1989 models. Fig. 4: Toyo Denso distributor terminal identification 6. Check the continuity in both directions between terminals A and B of the igniter unit. There should be continuity in only one direction. Fig. 5: Toyo Denso igniter unit terminal identification 7. Connect the ohmmeter positive probe to terminal D of the igniter and the negative probe to ground. The resistance should be approximately 50,000 ohms.

5 8. If ohmmeter readings are not as specified, replace igniter unit. COIL TEST ACCORD AND PRELUDE See Figure These vehicles use a 4-pin primary wiring configuration. With the ignition OFF, unplug the primary and secondary wiring connectors from the coil. 2. Measure resistance between terminals A and D. On Accords and Preludes, the resistance on the primary side should be ohms. On Preludes, it should be ohms. 3. Measure the resistance between terminal A and the secondary terminal. On Accords and 1987 Preludes, the resistance should be 11,074-11,526 ohms. On Preludes, it should be 9,040-13,560 ohms. 4. Check the resistance between terminals B and D. It should be approximately 2,100-2,300 ohms for all vehicles. Fig. 15: Ignition coil identification for Accords and Preludes 5. On carbureted engines, test at terminals A and C. Continuity must be present. Fuel injected engines do not use terminal C. 6. All test conditions must be met. If any test condition is not satisfied, the coil must be replaced. DISTRIBUTOR ACCORD AND PRELUDE WITH TOYO DENSO DISTRIBUTOR

See Figures 4 and 5 This procedure is not applicable to 1988-89 fuel injected Preludes. 1. Remove the distributor cap, rotor and shield.

6 See Figures 4 and 5 This procedure is not applicable to fuel injected Preludes. 1. Remove the distributor cap, rotor and shield. Remove the distributor hold-down bolts and remove the distributor for access. Leave the distributor wiring harness connected. 2. Remove the igniter unit from the distributor housing. 3. With the ignition switch ON, use a voltmeter to check for the presence of battery voltage at the black/yellow wire terminal, then at the terminal for the "BLU 1" wire. Battery voltage should be present in both cases. 4. Turn the ignition switch OFF. 5. Measure the resistance between the "BLU 2" and the adjacent green wire terminals. It should be approximately 750 ohms. The following steps do not pertain to 1989 models. Fig. 4: Toyo Denso distributor terminal identification 6. Check the continuity in both directions between terminals A and B of the igniter unit. There should be continuity in only one direction.

7 Fig. 5: Toyo Denso igniter unit terminal identification 7. Connect the ohmmeter positive probe to terminal D of the igniter and the negative probe to ground. The resistance should be approximately 50,000 ohms. 8. If ohmmeter readings are not as specified, replace igniter unit ACCORD AND PRELUDE WITH HITACHI DISTRIBUTOR See Figure 2 This procedure is not applicable to fuel injected Preludes. 1. Remove the distributor cap. 2. Disconnect the lead wires from the igniter unit. 3. Using a voltmeter with the ignition switch ON, check the voltage between the blue wire and body ground, then the black/yellow wire to body ground. There should be battery voltage present. 4. If no voltage is present, check the wiring to the igniter unit. 5. Turn the ignition OFF. Using an ohmmeter, check the continuity of the igniter at the terminals: a. Place the positive probe on the black/yellow wire terminal and negative probe on the blue wire terminal; continuity should be read on ohmmeter. b. Place the positive probe on the blue wire terminal and negative probe on the black/yellow wire terminal; no continuity should be read on the ohmmeter.

8 Fig. 2: Hitachi igniter wiring and terminals 6. If ohmmeter readings are not as specified, replace the igniter unit.

Before performing spark test, ensure ignitor is properly grounded.

Page 1 of 10 IGNITION CHECKS SPARK TEST NOTE: Before performing spark test, ensure ignitor is properly grounded. 1. Disconnect high tension coil wire from distributor. Hold coil wire approximately 1/2"