Circuit Description
Use this table only if the diagnosis in the Engine Cranks But Will Not Run indicated an injector circuit problem. If both injector circuits fail to blink when tested, diagnose one injector circuit at a time.
Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
-
This test determines if the ignition control module is generating a reference pulse, if the wiring is at fault or if the ECM is at fault. By touching and removing a test lamp, connected to 12 volts, to the IC reference high circuit, a reference pulse should be generated. If the injector test lamp blinks, the ECM and wiring are OK.
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This step tests for 12 volts to the injector. It will also determine if there is a short to voltage on the ECM side of the circuit.
-
This test checks for continuity to the ECM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did the Engine Cranks But Will Not Run table send you here? | -- | ||
2 | Was the injector test lamp on steady for one or both injectors? | -- | ||
3 |
Did you find a problem? | -- | ||
4 | Check the resistance across the fuel injector terminals with a J 39200 DVM. Is the resistance within the specified value? | 1.1-1.5 ohms | ||
5 |
Is the action complete? | -- | -- | |
Does the injector test lamp flash each time the test lamp is removed from the IC Reference High circuit terminal? | -- | |||
7 |
Did you find a problem? | -- | ||
8 | Replace the Distributor Ignition (DI) control module. Is the action complete? | -- | -- | |
9 |
Did you find problem? | -- | ||
10 |
Did you find a problem? | -- | ||
Was the test lamp ON for both terminals of each connector? | -- | |||
12 | Repair the short to voltage in both injector control circuits. Is the action complete? | -- | -- | |
13 | Was the test lamp OFF for both terminals on each connector? | -- | ||
14 | Repair the open in the ignition feed circuit to the injectors. Is the action complete? | -- | -- | |
Was the test lamp ON? | -- | |||
16 |
Did you find problem? | -- | ||
17 | Replace the ECM. Refer to Engine Control Module Replacement . Is the action complete? | -- | -- | |
18 |
Did you find a problem found? | -- | ||
19 | Repair the open in the injector 1 or 2 control circuits. Is the action complete? | -- | -- | |
20 |
Does the engine start and continue to run? | -- | ||
21 | Allow the engine to idle until it reaches the normal operating temperature. Are any DTCs stored? | -- | Go to the Applicable DTC Table | System OK |
