Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
NOTE:
For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
Did the DTC return?

Yes
- Go To 2
No
- Perform the TESTING FOR AN INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE (D441) DPT CAN (+) CIRCUIT FOR AN OPEN CIRCUIT OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the TCM harness connector.
3. Measure the resistance of the (D441) DPT CAN (+) circuit between the ESM harness connector and the TCM harness connector.
Is the resistance below 3.0 Ohms?

Yes
- Go To 3
No
- Repair the (D441) DPT CAN (+) circuit for an open or high resistance.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .
CHECK THE (D440) DPT CAN (-) CIRCUIT FOR AN OPEN CIRCUIT OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the TCM harness connector.
3. Measure the resistance of the (D440) DPT CAN (-) circuit between the ESM harness connector and the TCM harness connector.
Is the resistance below 3.0 Ohms?

Yes
- Go To 4
No
- Repair the (D440) DPT CAN (-) circuit for an open or high resistance.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .
CHECK THE (D441) DPT CAN (+) CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (D441) DPT CAN (+) circuit at the TCM harness connector.
  Is there continuity between ground and the (D441) DPT CAN (+) circuit?
Yes
- Repair the (D441) DPT CAN (+) circuit for a short to ground.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .
No
- Go To 5
CHECK THE (D440) DPT CAN (-) CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (D440) DPT CAN (-) circuit at the TCM harness connector.
2. Check for continuity between ground and the (D440) CAN DPT (-) circuit at the TCM harness connector.
Is there continuity between ground and the (D440) CAN DPT (-) circuit?

Yes
- Repair the (D440) CAN DPT (-) circuit for a short to ground.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .
No
- Go To 6
CHECK THE (D441) DPT CAN (+) CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Check for continuity between the (D441) DPT CAN (+) circuit and all other circuits at the TCM harness connector.
Is there continuity between the (D441) DPT CAN (+) circuit and any other circuit?

Yes
- Repair the (D441) DPT CAN (+) circuit for a short to another circuit.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .
No
- Go To 7
CHECK THE (D440) DPT CAN (-) CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Check for continuity between the (D440) DPT CAN (-) and all other circuits at the TCM harness connector.
Is there continuity between the (D440) DPT CAN (-) and any other circuit?

Yes
- Repair the (D440) DPT CAN (-) for a short to another circuit.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .
No
- Using the schematics as a guide, check the Electronic Shift Module (ESM) connector and all related in-line connector terminals for corrosion, damage, or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace the ESM in accordance with the Service Information. Refer to MODULE, ELECTRONIC SHIFT (ESM), REMOVAL AND INSTALLATION .
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .