P2146

P2146 - BANK 1 (CYLINDERS 1-3) SHORTED HIGH OR LOW






For complete wiring diagrams refer to Diagrams/Electrical.

- When Monitored:

While the engine is running.

- Set Condition:

A circuit failure detected at cylinders 1, 2, or 3 or any combination of cylinders 1, 2, or 3.

Possible Causes:

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

1. OTHER DTC'S

With the scan tool, read DTCs.

Do you have any combination of DTC's P0201, P0202, or P0203?

Yes

- Repair other DTC's first.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 2

2. LOW SIDE DRIVER CIRCUIT SHORTED IN INJECTOR HARNESS






Turn the ignition off.

Disconnect the ECM harness connectors.

Measure the resistance of each of the Bank 1 low side driver circuit to all other Bank 1 low side driver circuit at the ECM harness connector.

Is the resistance greater than 100k Ohms?

Yes

- Go To 3

No

- Replace the injector harness.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

3. HIGH SIDE DRIVER CIRCUIT OPEN






Disconnect the Injector 1-3 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the injector high side driver circuit between the Bank 1 high side driver circuit in the ECM harness connector and the high side driver circuit in the injector harness connectors for cylinders 1-3.

Is the resistance less than 10 Ohms?

Yes

- Go To 4

No

- Repair the open high side driver circuit from ECM harness connector to the Injector harness connector.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

4. LOW SIDE DRIVER CIRCUIT OPEN






Measure the resistance of the 1, 2, and 3 injector low side driver circuits between the ECM harness connector and the injector harness connectors.

Is the resistance less than 10 Ohms?

Yes

- Go To 5

No

- Repair the open low side driver circuit.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

5. HIGH SIDE DRIVER SHORTED TO LOW SIDE DRIVER






Measure the resistance between the Bank 1 high side driver circuit at the ECM harness connector and the low side driver circuit for injectors 1-3 at the ECM harness connector.

Is the resistance more than 100k Ohms?

Yes

- Go To 6

No

- Repair the High side circuit shorted to the low side circuit.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

6. HIGH SIDE DRIVERS SHORTED LOW







Measure the resistance of the injector harness connector high side driver circuits to battery negative for injectors 1-3.

Is the resistance more than 100k Ohms?

Yes

- Go To 7

No

- Repair the High side driver shorted low in the harness.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

7. LOW SIDE DRIVERS SHORTED LOW






Measure the resistance of the injector harness connector Low side driver circuits to battery negative for injectors 1-3.

Is the resistance more than 100k Ohms?

Yes

- Go To 8

No

- Repair the Low side driver shorted low in the harness.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

8. HIGH SIDE DRIVER SHORTED TO VOLTAGE






Measure the voltage between the high side driver circuit in the engine harness and battery negative.

Is the voltage less than 1 volt?

Yes

- Go To 9

No

- Repair the high side driver shorted to voltage.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

9. LOW SIDE DRIVER SHORTED TO VOLTAGE






Measure the voltage between the low side driver circuit in the engine harness and battery negative for cylinders 1-3.

Is the voltage less than 1 volt?

Yes

- Go To 10

No

- Repair the low side driver shorted to voltage.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

10. LOW SIDE DRIVER CIRCUIT SHORTED OTHER LOW SIDE DRIVER CIRCUIT






Measure the resistance of each of the Bank 1 low side driver circuit to all other Bank 1 low side driver circuits at the ECM harness connector.

Is the resistance greater than 100k ohms?

Yes

- Go To 2

No

- Repair Low side driver circuit shorted to other Low side driver circuit.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test


11. INJECTOR CIRCUITS SHORTED INSIDE ENGINE






Disconnect the injector through head harness connector.

Measure the resistance of each injector from the through head connector.


NOTE: Be sure to zero the ohm meter prior to checking the injector circuit.

Is the resistance greater than 0 ohms and less than 1 ohm?

Yes

- Go To 12

No

- Go To 15

12. INJECTOR HARNESS






Disconnect the pigtail nuts from injectors 1-3.

Note: Check connectors-Clean/Repair as necessary.

Measure resistance of each circuit in the injector harness from pigtail side to injector harness connector.

Is the resistance above 1 ohm?

Yes

- Replace the injector harness.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 13


13. INJECTOR






Measure the resistance between the solenoid posts of each injector.


NOTE: Be sure to zero the ohm meter prior to checking the injector circuit.

Is the resistance less than 1 ohm and greater than 0 ohms?

Yes

- Replace the fuel injector or injectors.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 14


14. INJECTOR

Measure resistance between a solenoid post and battery negative.

Note: Be sure to zero the ohm meter prior to checking the injector circuit.

Is resistance more than 100k Ohms?

Yes

- Go To 15

No

- Replace the injector or injectors.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

15. ECM

Reconnect the all injector pig tails harness connector.

Reconnect the ECM harness connector.

Reconnect the Injector harness connector.

Start the engine.

With the scan tool, read DTCs.

Did the DTC return?

Yes

- Replace and program the ECM.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition