No Response From Engine Control Module (PCI Bus) - Diesel

NO RESPONSE FROM ENGINE CONTROL MODULE (PCI BUS) - DIESEL

No Response From Engine Control Module (PCI BUS) - Diesel:

POSSIBLE CAUSES
- Engine control module power and ground
- (D25) PCI BUS circuit open
- Engine control module

Diagnostic Test

1. ESTABLISH COMMUNICATIONS WITH OTHER PCI BUS MODULES
Turn the ignition on.

NOTE:
- Ensure there is PCI bus communication with other modules. If not, refer to the PCI Bus Communication Failure symptom and repair as necessary.
- As soon as one or more modules communicates with the DRB, answer the question.

With the DRB, attempt to communicate with the ORC.
With the DRB, attempt to communicate with the Instrument Cluster.

Q: Was the DRB able to I/D or communicate with either of the modules?

YES: Go To 2
NO: Perform POWERTRAIN VERIFICATION TEST - VER 1 (DIESEL). Powertrain Verification Test - Ver 1

2. (D25) PCI BUS CIRCUIT OPEN




With the DRB, read Engine Control Module DTC's. This is to ensure power and ground to the ECM are operational.

NOTE:
- If the DRB will not read ECM DTC's, follow the NO RESPONSE TO ECM (SCI ONLY) symptom.
- If the vehicle will not start and the DRB displays a no response message, refer to the appropriate symptom. Testing and Inspection

Turn the ignition off.
Disconnect the Engine Control Module C2 harness connector.
Turn the ignition on.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.
Connect the scope input cable to the channel one connector on the DRB.
Attach the red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII(R) select Pep Module Tools.
Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts.
Press F2 again when complete.
Connect the Black lead to the chassis ground.
Connect the Red lead to the PCI Bus circuit in the Engine Control Module connector.
Observe the voltage display on the DRB Lab Scope.

Q: Does the voltage pulse from 0 to approximately 7.5 volts?

YES: Replace the Engine Control Module. Perform POWERTRAIN VERIFICATION TEST - VER 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Repair the (D25) PCI Bus circuit for an open. Perform POWERTRAIN VERIFICATION TEST - VER 1 (DIESEL). Powertrain Verification Test - Ver 1