Ignition Control Module: Testing and Inspection

IGNITION COIL & POWER TRANSISTOR




The ignition signal from the ECM is sent to the power transistor. The power transistor switches on and off the ignition coil primary circuit. As the primary circuit is turned on and off, the proper high voltage is induced in the coil secondary circuit,

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

Note: If both DTC P0340 (0101) and P1320 (0201) are displayed, perform TROUBLE DIAGNOSIS FOR DTC P0340 first.

With Consult
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT
(3) Start engine. (If engine does not run, turn ignition switch to "START" for at least 5 seconds.)

OR

With GST
(1) Turn ignition switch "ON".
(2) Start engine. (If engine does not run, turn ignition switch to "START" for at least 5 seconds.)
(3) Select MODE 3 with GST

OR

Without Scan Tools
(1) Turn ignition switch "ON".
(2) Start engine. (If engine does not run, turn ignition switch to "START' for at (least 5 seconds.)
(3) Turn ignition switch "OFF" and wait at least 5 seconds, then turn "ON".
(4) Perform "Diagnostic Test Mode II" (Self-diagnostic results) with ECM.

CIRCUIT DIAGRAM





DIAGNOSTIC PROCEDURE








COMPONENT INSPECTION
Ignition coil
1. Disconnect ignition coil harness connector.







2. Check resistance as shown in the figure.

If NG, replace ignition coil.

Power transistor
1. Disconnect power transistor harness connector.







2. Check power transistor resistance between terminals (2) and (3).

If NG, replace power transistor.

Resistor
1. Disconnect resistor harness connector.




2. Check resistance between terminals.

Resistance: Approximately 2.2 k Ohms [at 25°C (77°F)]

If NG, replace resistor.