Refer to Engine Controls Schematics
Fuel Enable and Feul Injectors
Diagnostic Aids
| • | The PCM has integrated circuits that are fault protected. Therefore, if a circuit has failed, the integrated circuits may not be damaged. If this is the case, the IC will keep the circuit open until you have corrected the fault in the circuit. |
| • | When you have corrected the fault, reinstall the PCM. |
| • | Inspect the circuit. |
| • | Replace the PCM only if the circuit is still inoperative. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step determines if the ignition feed circuit to the injectors are OK.
-
This step determines if the injector control circuits are OK.
-
This step determines if there is an internal PCM short to ground for an injector control circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
Is the test lamp on for both of the injector feed circuits? | -- | |||
3 | Is the test lamp on for only some of the injector feed circuit? | -- | ||
4 | Check the injector fuse. Is the fuse open? | -- | ||
5 | Check for an open or a short to ground on the effected injector feed circuits. Was a problem found? | -- | -- | |
Does the injector test lamp flash for each injector? | -- | |||
7 | Is the injector test lamp on steady for any injector circuit? | -- | ||
Is the injector test lamp OFF? | -- | |||
9 | Check for an open injector control circuit. Was a problem found? | -- | ||
10 | Check for a short to ground on the injector feed circuit. Was a problem found? | -- | -- | |
11 | Repair the open or short to ground on both of the injector feed circuits. Is the action complete? | -- | -- | |
12 | Repair circuit as necessary. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
13 | Repair short to ground in the injector control circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
14 | Check the terminal contact at the PCM. Was a problem found? | -- | ||
15 | Repair terminal contact as necessary. Is action complete? | -- | -- | |
16 |
Important: Program the new PCM. Replace the PCM. Refer to Powertrain Control Module Replacement . Is the action complete? | -- | -- | |
17 |
Does the engine start and continue to run? | -- | ||
18 |
Are any DTCs displayed that have not been diagnosed? | -- | Go to the applicable DTC table | |
19 | Use the scan tool in order to display the Capture Info and the Review Capture Info function. Are there any DTCs displayed that have not been diagnosed? | -- | Go to the applicable DTC table | System OK |
