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HOMESERVICE MANUALSTOYOTA1991SUPRA L6-3.0L DOHC TURBO (7M-GTE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMRELAYS AND MODULES - IGNITION SYSTEMIGNITION CONTROL MODULETESTING AND INSPECTION
1991 Toyota Supra L6-3.0L DOHC Turbo (7M-GTE)
Ignition Control Module: Testing and Inspection
1991 Toyota Supra L6-3.0L DOHC Turbo (7M-GTE)SECTION Testing and Inspection
INSPECTION OF IGNITER
1. CHECK POWER SOURCE LINE VOLTAGE
(a) Disconnect the connector 6-P.
(b) Turn the ignition switch ON.
(c) Using a voltmeter, connect the positive (+) probe to the terminal 3 of harness side and negative (-) probe to body ground.
Voltage: Approx. 12 V
(d) Connect the connector 6-P.
2. CHECK POWER TRANSISTOR IN IGNITER
(a) Disconnect the connector 4-P.
(b) Disconnect each ignition coil from its connector.
(c) Turn the ignition switch ON.
(d) Using an ohmmeter, connect terminal 2 of ignition coil C and body ground.
(e) Using a 3V dry cell battery, apply voltage to terminal 2 of connector 4-P.
As voltage is applied, check that there is momentary continuity.
(f) Using an ohmmeter, connect terminal 2 of ignition coil A and body ground.
(g) Using a 3V dry cell battery, apply voltage to terminal 4 of the 4-P connector.
(h) With terminal 4 connected apply voltage to terminal 2 of connector 4-P. As you apply voltage, check that there is momentary continuity.
(i) Using an ohmmeter, connect terminal 2 of ignition coil B and body ground.
(j) Using a 3V dry cell battery, apply voltage to terminal 3 of the 4-P connector.
(k) With terminal 3 connected apply voltage to terminal 2 of connector 4-P. As you apply voltage, check that there is momentary continuity.
1. CHECK POWER SOURCE LINE VOLTAGE
(a) Disconnect the connector 6-P.
(b) Turn the ignition switch ON.
(c) Using a voltmeter, connect the positive (+) probe to the terminal 3 of harness side and negative (-) probe to body ground.
Voltage: Approx. 12 V
(d) Connect the connector 6-P.
2. CHECK POWER TRANSISTOR IN IGNITER
(a) Disconnect the connector 4-P.
(b) Disconnect each ignition coil from its connector.
(c) Turn the ignition switch ON.
(d) Using an ohmmeter, connect terminal 2 of ignition coil C and body ground.
(e) Using a 3V dry cell battery, apply voltage to terminal 2 of connector 4-P.
As voltage is applied, check that there is momentary continuity.
(f) Using an ohmmeter, connect terminal 2 of ignition coil A and body ground.
(g) Using a 3V dry cell battery, apply voltage to terminal 4 of the 4-P connector.
(h) With terminal 4 connected apply voltage to terminal 2 of connector 4-P. As you apply voltage, check that there is momentary continuity.
(i) Using an ohmmeter, connect terminal 2 of ignition coil B and body ground.
(j) Using a 3V dry cell battery, apply voltage to terminal 3 of the 4-P connector.
(k) With terminal 3 connected apply voltage to terminal 2 of connector 4-P. As you apply voltage, check that there is momentary continuity.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.